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nexus: Add packing rules for BRAM

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-10-22 13:45:13 +01:00
parent 8d1678f0ef
commit 4503608c7c
2 changed files with 94 additions and 0 deletions
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33
nexus/constids.inc
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@ -170,3 +170,36 @@ X(CLKO)
X(DPR16X4)
X(INITVAL)
X(DP16K)
X(PDP16K)
X(PDPSC16K)
X(SP16K)
X(FIFO16K)
X(DP16K_MODE)
X(PDP16K_MODE)
X(PDPSC16K_MODE)
X(SP16K_MODE)
X(FIFO16K_MODE)
X(DPSC512K)
X(PDPSC512K)
X(SP512K)
X(DPSC512K_MODE)
X(PDPSC512K_MODE)
X(SP512K_MODE)
X(WID)
X(CSDECODE_A)
X(CSDECODE_B)
X(CSDECODE_R)
X(CSDECODE_W)
X(CSDECODE)
X(CLKW)
X(CLKR)
X(CEW)
X(CER)
X(RST)

61
nexus/pack.cc
View File

@ -990,11 +990,72 @@ struct NexusPacker
}
}
void convert_prims()
{
// Convert primitives from their non-CORE variant to their CORE variant
static const std::unordered_map<IdString, IdString> prim_map = {
{id_OSCA, id_OSC_CORE}, {id_DP16K, id_DP16K_MODE}, {id_PDP16K, id_PDP16K_MODE},
{id_PDPSC16K, id_PDPSC16K_MODE}, {id_SP16K, id_SP16K_MODE}, {id_FIFO16K, id_FIFO16K_MODE},
};
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (!prim_map.count(ci->type))
continue;
prim_to_core(ci, prim_map.at(ci->type));
}
}
void add_bus_xform(XFormRule &rule, const std::string &o, const std::string &n, int width, int old_offset = 0,
int new_offset = 0)
{
for (int i = 0; i < width; i++)
rule.port_xform[bus_flat(o, i + old_offset)] = bus_flat(n, i + new_offset);
}
void pack_bram()
{
std::unordered_map<IdString, XFormRule> bram_rules;
bram_rules[id_DP16K_MODE].new_type = id_OXIDE_EBR;
bram_rules[id_DP16K_MODE].set_params.emplace_back(id_MODE, std::string("DP16K"));
bram_rules[id_DP16K_MODE].parse_params.emplace_back(id_CSDECODE_A, id_CSDECODE_A, 3, 7);
bram_rules[id_DP16K_MODE].parse_params.emplace_back(id_CSDECODE_B, id_CSDECODE_B, 3, 7);
// Pseudo dual port
bram_rules[id_PDP16K_MODE].new_type = id_OXIDE_EBR;
bram_rules[id_PDP16K_MODE].set_params.emplace_back(id_MODE, std::string("PDP16K"));
bram_rules[id_PDP16K_MODE].parse_params.emplace_back(id_CSDECODE_R, id_CSDECODE_R, 3, 7);
bram_rules[id_PDP16K_MODE].parse_params.emplace_back(id_CSDECODE_W, id_CSDECODE_W, 3, 7);
bram_rules[id_PDP16K_MODE].port_xform[id_CLKW] = id_CLKA;
bram_rules[id_PDP16K_MODE].port_xform[id_CLKR] = id_CLKB;
bram_rules[id_PDP16K_MODE].port_xform[id_CEW] = id_CEA;
bram_rules[id_PDP16K_MODE].port_xform[id_CER] = id_CEB;
bram_rules[id_PDP16K_MODE].port_multixform[id_RST] = {id_RSTA, id_RSTB};
add_bus_xform(bram_rules[id_PDP16K_MODE], "ADW", "ADA", 14);
add_bus_xform(bram_rules[id_PDP16K_MODE], "ADR", "ADB", 14);
add_bus_xform(bram_rules[id_PDP16K_MODE], "CSW", "CSA", 3);
add_bus_xform(bram_rules[id_PDP16K_MODE], "CSR", "CSB", 3);
add_bus_xform(bram_rules[id_PDP16K_MODE], "DI", "DIA", 18, 0, 0);
add_bus_xform(bram_rules[id_PDP16K_MODE], "DI", "DIB", 18, 18, 0);
add_bus_xform(bram_rules[id_PDP16K_MODE], "DO", "DOB", 18, 0, 0);
add_bus_xform(bram_rules[id_PDP16K_MODE], "DO", "DOA", 18, 18, 0);
// Pseudo dual port; single clock
bram_rules[id_PDPSC16K_MODE] = bram_rules[id_PDP16K_MODE];
bram_rules[id_PDPSC16K_MODE].set_params.clear();
bram_rules[id_PDPSC16K_MODE].set_params.emplace_back(id_MODE, std::string("PDPSC16K"));
bram_rules[id_PDPSC16K_MODE].port_multixform[id_CLK] = {id_CLKA, id_CLKB};
log_info("Packing BRAM...\n");
generic_xform(bram_rules, true);
}
explicit NexusPacker(Context *ctx) : ctx(ctx) {}
void operator()()
{
pack_io();
convert_prims();
pack_bram();
pack_lutram();
pack_ffs();
pack_constants();