Gowin. Add the ability to place registers in IOB
IO blocks have registers: for input, for output and for OutputEnable signal - IREG, OREG and TREG respectively. Each of the registers has one implicit non-switched wire, which one depends on the type of register (IREG has a Q wire, OREG has a D wire). Although the registers can be activated independently of each other they share the CLK, ClockEnable and LocalSetReset wires and this places restrictions on the possible combinations of register types in a single IO. Register placement in IO blocks is enabled by specifying the command line keys --vopt ireg_in_iob, --vopt oreg_in_iob, or --vopt ioreg_in_iob. It should be noted that specifying these keys leads to attempts to place registers in IO blocks, but no errors are generated in case of failure. Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
This commit is contained in:
parent
d810aac867
commit
b82cf51aea
@ -1312,3 +1312,22 @@ X(LSREN)
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// EMCU
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X(EMCU)
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// Register placement options
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X(IREG_IN_IOB)
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X(OREG_IN_IOB)
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X(IOREG_IN_IOB)
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X(HAS_REG)
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X(IREG_TYPE)
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X(OREG_TYPE)
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X(TREG_TYPE)
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X(IREG_CLK_NET)
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X(IREG_CE_NET)
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X(IREG_LSR_NET)
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X(OREG_CLK_NET)
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X(OREG_CE_NET)
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X(OREG_LSR_NET)
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X(TREG_CLK_NET)
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X(TREG_CE_NET)
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X(TREG_LSR_NET)
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@ -196,6 +196,17 @@ void GowinImpl::init(Context *ctx)
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if (args.options.count("cst")) {
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ctx->settings[ctx->id("cst.filename")] = args.options.at("cst");
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}
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// place registers in IO blocks
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if (args.options.count("ireg_in_iob")) {
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ctx->settings[id_IREG_IN_IOB] = Property(1);
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}
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if (args.options.count("oreg_in_iob")) {
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ctx->settings[id_OREG_IN_IOB] = Property(1);
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}
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if (args.options.count("ioreg_in_iob")) {
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ctx->settings[id_IOREG_IN_IOB] = Property(1);
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}
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}
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// We do not allow the use of global wires that bypass a special router.
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@ -21,6 +21,10 @@ inline bool is_dff(const CellInfo *cell) { return type_is_dff(cell->type); }
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inline bool type_is_alu(IdString cell_type) { return cell_type == id_ALU; }
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inline bool is_alu(const CellInfo *cell) { return type_is_alu(cell->type); }
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// io
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inline bool type_is_io(IdString cell_type) { return cell_type.in(id_IBUF, id_OBUF, id_IOBUF, id_TBUF); }
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inline bool is_io(const CellInfo *cell) { return type_is_io(cell->type); }
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inline bool type_is_diffio(IdString cell_type)
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{
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return cell_type.in(id_ELVDS_IOBUF, id_ELVDS_IBUF, id_ELVDS_TBUF, id_ELVDS_OBUF, id_TLVDS_IOBUF, id_TLVDS_IBUF,
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@ -184,8 +184,9 @@ struct GowinPacker
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for (auto &cell : ctx->cells) {
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CellInfo &ci = *cell.second;
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if (!ci.type.in(id_IBUF, id_OBUF, id_TBUF, id_IOBUF))
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if (!is_io(&ci)) {
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continue;
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}
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if (ci.attrs.count(id_BEL) == 0) {
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log_error("Unconstrained IO:%s\n", ctx->nameOf(&ci));
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}
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@ -204,10 +205,7 @@ struct GowinPacker
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// ===================================
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// Differential IO
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// ===================================
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static bool is_iob(const Context *ctx, CellInfo *cell)
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{
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return (cell->type.in(id_IBUF, id_OBUF, id_TBUF, id_IOBUF));
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}
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static bool is_iob(const Context *ctx, CellInfo *cell) { return is_io(cell); }
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std::pair<CellInfo *, CellInfo *> get_pn_cells(const CellInfo &ci)
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{
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@ -502,7 +500,9 @@ struct GowinPacker
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out_iob->disconnectPort(id_I);
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ci.disconnectPort(out_port);
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if (ci.type == id_IOLOGICO_EMPTY) {
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ci.movePortTo(id_D, out_iob, id_I);
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if (ci.attrs.count(id_HAS_REG) == 0) {
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ci.movePortTo(id_D, out_iob, id_I);
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}
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return;
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}
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set_daaj_nets(ci, iob_bel);
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@ -630,7 +630,9 @@ struct GowinPacker
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in_iob->disconnectPort(id_O);
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ci.disconnectPort(in_port);
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if (ci.type == id_IOLOGICI_EMPTY) {
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ci.movePortTo(id_Q, in_iob, id_O);
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if (ci.attrs.count(id_HAS_REG) == 0) {
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ci.movePortTo(id_Q, in_iob, id_O);
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}
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return;
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}
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@ -640,6 +642,260 @@ struct GowinPacker
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make_iob_nets(*in_iob);
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}
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static bool is_ff(const Context *ctx, CellInfo *cell) { return is_dff(cell); }
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static bool incompatible_ffs(IdString type_a, IdString type_b)
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{
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return type_a != type_b &&
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((type_a == id_DFFS && type_b != id_DFFR) || (type_a == id_DFFR && type_b != id_DFFS) ||
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(type_a == id_DFFSE && type_b != id_DFFRE) || (type_a == id_DFFRE && type_b != id_DFFSE) ||
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(type_a == id_DFFP && type_b != id_DFFC) || (type_a == id_DFFC && type_b != id_DFFP) ||
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(type_a == id_DFFPE && type_b != id_DFFCE) || (type_a == id_DFFCE && type_b != id_DFFPE) ||
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(type_a == id_DFFNS && type_b != id_DFFNR) || (type_a == id_DFFNR && type_b != id_DFFNS) ||
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(type_a == id_DFFNSE && type_b != id_DFFNRE) || (type_a == id_DFFNRE && type_b != id_DFFNSE) ||
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(type_a == id_DFFNP && type_b != id_DFFNC) || (type_a == id_DFFNC && type_b != id_DFFNP) ||
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(type_a == id_DFFNPE && type_b != id_DFFNCE) || (type_a == id_DFFNCE && type_b != id_DFFNPE));
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}
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void pack_io_regs()
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{
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log_info("Pack FFs into IO cells...\n");
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std::vector<IdString> cells_to_remove;
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std::vector<IdString> nets_to_remove;
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std::vector<std::unique_ptr<CellInfo>> new_cells;
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for (auto &cell : ctx->cells) {
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CellInfo &ci = *cell.second;
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if (!is_io(&ci)) {
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continue;
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}
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// In the case of placing multiple registers in the IO it should be
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// noted that the CLK, ClockEnable and LocalSetReset nets must
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// match.
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const NetInfo *clk_net = nullptr;
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const NetInfo *ce_net = nullptr;
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const NetInfo *lsr_net = nullptr;
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IdString reg_type;
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// input reg in IO
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CellInfo *iologic_i = nullptr;
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if ((ci.type == id_IBUF && ctx->settings.count(id_IREG_IN_IOB)) ||
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(ci.type == id_IOBUF && ctx->settings.count(id_IOREG_IN_IOB))) {
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// OBUF O -> D FF
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CellInfo *ff = net_only_drives(ctx, ci.ports.at(id_O).net, is_ff, id_D, true);
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if (ff != nullptr) {
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BelId l_bel = get_iologico_bel(&ci);
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if (l_bel == BelId()) {
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continue;
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}
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if (ctx->debug) {
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log_info(" trying %s ff as Input Register of %s IO\n", ctx->nameOf(ff), ctx->nameOf(&ci));
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}
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clk_net = ff->getPort(id_CLK);
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ce_net = ff->getPort(id_CE);
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for (IdString port : {id_SET, id_RESET, id_PRESET, id_CLEAR}) {
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lsr_net = ff->getPort(port);
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if (lsr_net != nullptr) {
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break;
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}
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}
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reg_type = ff->type;
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// create IOLOGIC cell for flipflop
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IdString iologic_name = gwu.create_aux_name(ci.name, 0, "_iobff$");
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auto iologic_cell = gwu.create_cell(iologic_name, id_IOLOGICI_EMPTY);
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new_cells.push_back(std::move(iologic_cell));
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iologic_i = new_cells.back().get();
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// move ports
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for (auto &port : ff->ports) {
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IdString port_name = port.first;
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ff->movePortTo(port_name, iologic_i, port_name != id_Q ? port_name : id_Q4);
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}
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if (ctx->verbose) {
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log_info(" place FF %s into IBUF %s, make iologic_i %s\n", ctx->nameOf(ff), ctx->nameOf(&ci),
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ctx->nameOf(iologic_i));
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}
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iologic_i->setAttr(id_HAS_REG, 1);
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iologic_i->setAttr(id_IREG_TYPE, ff->type.str(ctx));
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cells_to_remove.push_back(ff->name);
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}
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}
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// output reg in IO
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CellInfo *iologic_o = nullptr;
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if ((ci.type == id_OBUF && ctx->settings.count(id_OREG_IN_IOB)) ||
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(ci.type == id_IOBUF && ctx->settings.count(id_IOREG_IN_IOB))) {
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while (1) {
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// OBUF I <- Q FF
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if (ci.ports.at(id_I).net->users.entries() != 1) {
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break;
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}
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CellInfo *ff = net_driven_by(ctx, ci.ports.at(id_I).net, is_ff, id_Q);
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if (ff != nullptr) {
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BelId l_bel = get_iologico_bel(&ci);
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if (l_bel == BelId()) {
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break;
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}
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if (ctx->debug) {
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log_info(" trying %s ff as Output Register of %s IO\n", ctx->nameOf(ff), ctx->nameOf(&ci));
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}
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const NetInfo *this_clk_net = ff->getPort(id_CLK);
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const NetInfo *this_ce_net = ff->getPort(id_CE);
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const NetInfo *this_lsr_net;
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for (IdString port : {id_SET, id_RESET, id_PRESET, id_CLEAR}) {
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this_lsr_net = ff->getPort(port);
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if (this_lsr_net != nullptr) {
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break;
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}
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}
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// The IOBUF may already have registers placed
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if (ci.type == id_IOBUF) {
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if (iologic_i != nullptr) {
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if (incompatible_ffs(ff->type, reg_type)) {
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if (ctx->debug) {
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log_info(" FF types conflict:%s vs %s\n", ff->type.c_str(ctx),
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reg_type.c_str(ctx));
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}
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break;
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} else {
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if (clk_net != this_clk_net || ce_net != this_ce_net || lsr_net != this_lsr_net) {
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if (ctx->debug) {
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log_info(" Nets conflict.\n");
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}
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break;
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}
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}
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} else {
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clk_net = this_clk_net;
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ce_net = this_ce_net;
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lsr_net = this_lsr_net;
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reg_type = ff->type;
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}
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}
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// create IOLOGIC cell for flipflop
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IdString iologic_name = gwu.create_aux_name(ci.name, 1, "_iobff$");
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auto iologic_cell = gwu.create_cell(iologic_name, id_IOLOGICO_EMPTY);
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new_cells.push_back(std::move(iologic_cell));
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iologic_o = new_cells.back().get();
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// move ports
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for (auto &port : ff->ports) {
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IdString port_name = port.first;
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ff->movePortTo(port_name, iologic_o, port_name != id_D ? port_name : id_D0);
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}
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if (ctx->verbose) {
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log_info(" place FF %s into OBUF %s, make iologic_o %s\n", ctx->nameOf(ff),
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ctx->nameOf(&ci), ctx->nameOf(iologic_o));
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}
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iologic_o->setAttr(id_HAS_REG, 1);
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iologic_o->setAttr(id_OREG_TYPE, ff->type.str(ctx));
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cells_to_remove.push_back(ff->name);
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}
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break;
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}
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}
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// output enable reg in IO
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if (ci.type == id_IOBUF && ctx->settings.count(id_IOREG_IN_IOB)) {
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while (1) {
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// IOBUF OEN <- Q FF
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if (ci.ports.at(id_OEN).net->users.entries() != 1) {
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continue;
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}
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CellInfo *ff = net_driven_by(ctx, ci.ports.at(id_OEN).net, is_ff, id_Q);
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if (ff != nullptr) {
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BelId l_bel = get_iologico_bel(&ci);
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if (l_bel == BelId()) {
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continue;
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}
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if (ctx->debug) {
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log_info(" trying %s ff as Output Enable Register of %s IO\n", ctx->nameOf(ff),
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ctx->nameOf(&ci));
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}
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const NetInfo *this_clk_net = ff->getPort(id_CLK);
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const NetInfo *this_ce_net = ff->getPort(id_CE);
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const NetInfo *this_lsr_net;
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for (IdString port : {id_SET, id_RESET, id_PRESET, id_CLEAR}) {
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this_lsr_net = ff->getPort(port);
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if (this_lsr_net != nullptr) {
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break;
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}
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}
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// The IOBUF may already have registers placed
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if (iologic_i != nullptr || iologic_o != nullptr) {
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if (iologic_o == nullptr) {
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iologic_o = iologic_i;
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}
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if (incompatible_ffs(ff->type, reg_type)) {
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if (ctx->debug) {
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log_info(" FF types conflict:%s vs %s\n", ff->type.c_str(ctx),
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reg_type.c_str(ctx));
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}
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break;
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} else {
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if (clk_net != this_clk_net || ce_net != this_ce_net || lsr_net != this_lsr_net) {
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if (ctx->debug) {
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log_info(" Nets conflict.\n");
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}
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break;
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}
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}
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}
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if (iologic_o == nullptr) {
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// create IOLOGIC cell for flipflop
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IdString iologic_name = gwu.create_aux_name(ci.name, 2, "_iobff$");
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auto iologic_cell = gwu.create_cell(iologic_name, id_IOLOGICO_EMPTY);
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new_cells.push_back(std::move(iologic_cell));
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iologic_o = new_cells.back().get();
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}
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// move ports
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for (auto &port : ff->ports) {
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IdString port_name = port.first;
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if (port_name == id_Q) {
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continue;
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}
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ff->movePortTo(port_name, iologic_o, port_name != id_D ? port_name : id_TX);
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}
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nets_to_remove.push_back(ci.getPort(id_OEN)->name);
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ci.disconnectPort(id_OEN);
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ff->disconnectPort(id_Q);
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if (ctx->verbose) {
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log_info(" place FF %s into IOBUF %s, make iologic_o %s\n", ctx->nameOf(ff),
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ctx->nameOf(&ci), ctx->nameOf(iologic_o));
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}
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iologic_o->setAttr(id_HAS_REG, 1);
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iologic_o->setAttr(id_TREG_TYPE, ff->type.str(ctx));
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cells_to_remove.push_back(ff->name);
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}
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break;
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}
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}
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}
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for (auto cell : cells_to_remove) {
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ctx->cells.erase(cell);
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}
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for (auto &ncell : new_cells) {
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ctx->cells[ncell->name] = std::move(ncell);
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}
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for (auto net : nets_to_remove) {
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ctx->nets.erase(net);
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}
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}
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void pack_iodelay()
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{
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log_info("Pack IODELAY...\n");
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@ -3587,6 +3843,9 @@ struct GowinPacker
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pack_diff_iobs();
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ctx->check();
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pack_io_regs();
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ctx->check();
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pack_iodelay();
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ctx->check();
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