diff options
| author | gatecat <gatecat@ds0.me> | 2021-05-14 21:59:41 +0100 |
|---|---|---|
| committer | gatecat <gatecat@ds0.me> | 2021-05-15 14:54:33 +0100 |
| commit | 757a10c247615e85b6a04cb9524536857e54ced6 (patch) | |
| tree | a2084d38235739504114e7ea997bcdac05cf3a1c /mistral/lab.cc | |
| parent | dce847b2f3ab5257b41c2c12c2146ef400d56135 (diff) | |
| download | nextpnr-757a10c247615e85b6a04cb9524536857e54ced6.tar.gz nextpnr-757a10c247615e85b6a04cb9524536857e54ced6.tar.bz2 nextpnr-757a10c247615e85b6a04cb9524536857e54ced6.zip | |
mistral: Debugging flipflops
Signed-off-by: gatecat <gatecat@ds0.me>
Diffstat (limited to 'mistral/lab.cc')
| -rw-r--r-- | mistral/lab.cc | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mistral/lab.cc b/mistral/lab.cc index e117238b..734592fd 100644 --- a/mistral/lab.cc +++ b/mistral/lab.cc @@ -384,7 +384,7 @@ bool Arch::is_alm_legal(uint32_t lab, uint8_t alm) const bool route_thru_lut_avail = !luts[i] && !carry_mode && (total_lut_inputs < 8) && (used_lut_bits < 64); // E/F is available if this LUT is using 3 or fewer inputs - this is conservative and sharing can probably // improve this situation - bool ef_available = (!luts[i] || luts[i]->combInfo.used_lut_input_count <= 3); + bool ef_available = (!luts[i] || (luts[i]->combInfo.used_lut_input_count <= 2)); // Control set checking bool found_ff = false; @@ -393,6 +393,8 @@ bool Arch::is_alm_legal(uint32_t lab, uint8_t alm) const const CellInfo *ff = ffs[i * 2 + j]; if (!ff) continue; + if (j == 1) + return false; // TODO: why are these FFs broken? if (found_ff) { // Two FFs in the same half with an incompatible control set if (ctrlset != ff->ffInfo.ctrlset) @@ -782,7 +784,7 @@ void Arch::reassign_alm_inputs(uint32_t lab, uint8_t alm) continue; for (int j = 0; j < 2; j++) { CellInfo *ff = ffs[i * 2 + j]; - if (!ff || !ff->ffInfo.datain) + if (!ff || !ff->ffInfo.datain || alm_data.l6_mode) continue; CellInfo *rt_lut = createCell(id(stringf("%s$ROUTETHRU", nameOf(ff))), id_MISTRAL_BUF); rt_lut->addInput(id_A); @@ -793,7 +795,6 @@ void Arch::reassign_alm_inputs(uint32_t lab, uint8_t alm) connect_port(getCtx(), datain, rt_lut, id_A); connect_ports(getCtx(), rt_lut, id_Q, ff, id_DATAIN); // Assign route-thru LUT physical ports, input goes to the first half-specific input - NPNR_ASSERT(!alm_data.l6_mode); rt_lut->pin_data[id_A].bel_pins.push_back(i ? id_D : id_C); rt_lut->pin_data[id_Q].bel_pins.push_back(id_COMBOUT); assign_comb_info(rt_lut); |