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gatemate: PLL priority for BUFG (#1488)

This commit is contained in:
Miodrag Milanović 2025-05-19 09:55:39 +02:00 committed by GitHub
parent 6c3956c3b9
commit b0c29aa634
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GPG Key ID: B5690EEEBB952194
1 changed files with 33 additions and 18 deletions
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51
himbaechel/uarch/gatemate/pack_clocking.cc
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@ -18,6 +18,7 @@
*/
#include <boost/algorithm/string.hpp>
#include "design_utils.h"
#include "gatemate_util.h"
#include "pack.h"
@ -27,6 +28,8 @@
NEXTPNR_NAMESPACE_BEGIN
inline bool is_bufg(const BaseCtx *ctx, const CellInfo *cell) { return cell->type.in(id_CC_BUFG); }
void GateMatePacker::sort_bufg()
{
struct ItemBufG
@ -79,6 +82,36 @@ void GateMatePacker::pack_bufg()
{
log_info("Packing BUFGs..\n");
CellInfo *bufg[4] = {nullptr};
CellInfo *pll[4] = {nullptr};
for (auto &cell : ctx->cells) {
CellInfo &ci = *cell.second;
if (!ci.type.in(id_PLL))
continue;
pll[ci.constr_z - 4] = &ci;
}
auto update_bufg_port = [&](CellInfo *cell, int port_num, int pll_num) {
CellInfo *b = net_only_drives(ctx, cell->getPort(ctx->idf("CLK%d", 90 * port_num)), is_bufg, id_I, false);
if (b) {
if (bufg[port_num] == nullptr) {
bufg[port_num] = b;
} else {
if (bufg[pll_num] == nullptr) {
bufg[pll_num] = b;
} else {
log_error("Unable to place BUFG for PLL.\n");
}
}
}
};
for (int i = 0; i < 4; i++) {
if (pll[i]) {
for (int j = 0; j < 4; j++)
update_bufg_port(pll[i], j, i);
}
}
for (auto &cell : ctx->cells) {
CellInfo &ci = *cell.second;
if (!ci.type.in(id_CC_BUFG))
@ -94,24 +127,6 @@ void GateMatePacker::pack_bufg()
}
if (ctx->getBelBucketForCellType(in_net->driver.cell->type) == id_PLL) {
is_cpe_source = false;
int pll_index = in_net->driver.cell->constr_z - 4;
if (bufg[pll_index] == nullptr) {
bufg[pll_index] = &ci;
} else {
IdString origPort = in_net->driver.port;
int index = 0;
if (origPort == id_CLK90)
index = 1;
else if (origPort == id_CLK180)
index = 2;
else if (origPort == id_CLK270)
index = 3;
if (bufg[index] == nullptr) {
bufg[pll_index] = &ci;
} else {
log_error("Unable to place BUFG for PLL.\n");
}
}
}
if (is_cpe_source) {
ci.cluster = ci.name;