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Merge pull request #842 from yrabbit/delays

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gowin: Replace the zero delays with reasonable values.
This commit is contained in:
gatecat 2021-10-09 21:52:18 +01:00 committed by GitHub
commit e546cd00de
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3 changed files with 40 additions and 12 deletions
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47
gowin/arch.cc
View File

@ -371,6 +371,8 @@ DelayQuad Arch::getWireTypeDelay(IdString wire)
case ID_X06:
case ID_X07:
case ID_X08:
case ID_I0:
case ID_I1:
len = id_X0;
break;
case ID_N100:
@ -393,6 +395,7 @@ DelayQuad Arch::getWireTypeDelay(IdString wire)
case ID_SN20:
case ID_EW10:
case ID_EW20:
case ID_I01:
len = id_FX1;
break;
case ID_N200:
@ -589,8 +592,7 @@ void Arch::addMuxBels(const DatabasePOD *db, int row, int col)
IdString belname, bel_id;
char buf[40];
int z;
// XXX do real delay
DelayQuad delay = DelayQuad(0);
// make all wide luts with these parameters
struct
{
@ -632,26 +634,27 @@ void Arch::addMuxBels(const DatabasePOD *db, int row, int col)
IdString wire_i1_name = wireToGlobal(row, col, db, id_wire_i1);
addWire(wire_i1_name, id_wire_i1, col, row);
// dummy right pip
DelayQuad delay = getWireTypeDelay(id_I0);
snprintf(buf, 40, "%sF%c", mux_names[j].in_prefix, mux_names[j].in_idx[1]);
IdString id_src_F = id(buf);
IdString src_F = wireToGlobal(row, col, db, id_src_F);
snprintf(buf, 40, "R%dC%d_%s__%s", grow, gcol, id_src_F.c_str(this), id_wire_i1.c_str(this));
addPip(id(buf), id_wire_i1, src_F, wire_i1_name, delay, Loc(col, row, 0));
// dummy left pip
snprintf(buf, 40, "%sF%c", mux_names[j].in_prefix, mux_names[j].in_idx[0]);
IdString id_src_F = id(buf);
id_src_F = id(buf);
// LUT8's I0 is wired to the right cell
IdString src_F;
int src_col = col;
if (j == 7) {
++src_col;
delay = getWireTypeDelay(id_I01);
}
src_F = wireToGlobal(row, src_col, db, id_src_F);
snprintf(buf, 40, "R%dC%d_%s__%s", grow, gcol, id_src_F.c_str(this), id_wire_i0.c_str(this));
addPip(id(buf), id_wire_i0, src_F, wire_i0_name, delay, Loc(col, row, 0));
// dummy right pip
snprintf(buf, 40, "%sF%c", mux_names[j].in_prefix, mux_names[j].in_idx[1]);
id_src_F = id(buf);
src_F = wireToGlobal(row, col, db, id_src_F);
snprintf(buf, 40, "R%dC%d_%s__%s", grow, gcol, id_src_F.c_str(this), id_wire_i1.c_str(this));
addPip(id(buf), id_wire_i1, src_F, wire_i1_name, delay, Loc(col, row, 0));
// the MUX ports
snprintf(buf, 40, "R%dC%d_OF%d", grow, gcol, j);
addBelOutput(belname, id_OF, id(buf));
@ -1307,8 +1310,10 @@ void Arch::assignArchInfo()
for (auto &cell : getCtx()->cells) {
IdString cname = cell.first;
CellInfo *ci = cell.second.get();
DelayQuad delay = DelayQuad(0);
ci->is_slice = false;
if (ci->type == id("SLICE")) {
switch (ci->type.index) {
case ID_SLICE: {
ci->is_slice = true;
ci->ff_used = ci->params.at(id_FF_USED).as_bool();
ci->ff_type = id(ci->params.at(id_FF_TYPE).as_string());
@ -1333,6 +1338,24 @@ void Arch::assignArchInfo()
DelayQuad delay = delayLookup(speed->lut.timings.get(), speed->lut.num_timings, port_delay[i]);
addCellTimingDelay(cname, ports[i], id_F, delay);
}
break;
}
case ID_GW_MUX2_LUT8:
delay = delay + delayLookup(speed->lut.timings.get(), speed->lut.num_timings, id_fx_ofx1);
/* FALLTHRU */
case ID_GW_MUX2_LUT7:
delay = delay + delayLookup(speed->lut.timings.get(), speed->lut.num_timings, id_fx_ofx1);
/* FALLTHRU */
case ID_GW_MUX2_LUT6:
delay = delay + delayLookup(speed->lut.timings.get(), speed->lut.num_timings, id_fx_ofx1);
/* FALLTHRU */
case ID_GW_MUX2_LUT5: {
delay = delay + delayLookup(speed->lut.timings.get(), speed->lut.num_timings, id_fx_ofx1);
addCellTimingDelay(cname, id_I0, id_OF, delay);
addCellTimingDelay(cname, id_I1, id_OF, delay);
}
default:
break;
}
}
}

2
gowin/cells.cc
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@ -60,6 +60,8 @@ std::unique_ptr<CellInfo> create_generic_cell(Context *ctx, IdString type, std::
add_port(ctx, new_cell.get(), id_LSR, PORT_IN);
} else if (type == id_GW_MUX2_LUT5 || type == id_GW_MUX2_LUT6 || type == id_GW_MUX2_LUT7 ||
type == id_GW_MUX2_LUT7 || type == id_GW_MUX2_LUT8) {
add_port(ctx, new_cell.get(), id_I0, PORT_IN);
add_port(ctx, new_cell.get(), id_I1, PORT_IN);
add_port(ctx, new_cell.get(), id_SEL, PORT_IN);
add_port(ctx, new_cell.get(), id_OF, PORT_OUT);
} else if (type == id_IOB) {

3
gowin/constids.inc
View File

@ -440,3 +440,6 @@ X(a_f)
X(b_f)
X(c_f)
X(d_f)
X(fx_ofx1)
X(I01)