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ecp5: Fixing BRAM initialisation

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-10-10 17:21:37 +01:00
parent f7466110a5
commit 848ce6d41c
1 changed files with 14 additions and 4 deletions
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18
ecp5/bitstream.cc
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@ -142,13 +142,22 @@ std::vector<bool> parse_init_str(const std::string &str, int length)
log_error("hex string value too long, expected up to %d bits and found %d.\n", length, int(str.length()));
for (int i = 0; i < int(str.length()); i++) {
char c = str.at((str.size() - i) - 1);
NPNR_ASSERT(c == '0' || c == '1' || c == 'X');
NPNR_ASSERT(c == '0' || c == '1' || c == 'X' || c == 'x');
result.at(i) = (c == '1');
}
}
return result;
}
inline uint16_t bit_reverse(uint16_t x, int size)
{
uint16_t y = 0;
for (int i = 0; i < size; i++)
if (x & (1 << i))
y |= (1 << ((size - 1) - i));
return y;
}
// Get the PIO tile corresponding to a PIO bel
static std::string get_pio_tile(Context *ctx, BelId bel)
{
@ -494,7 +503,8 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
str_or_default(ci->params, ctx->id("ASYNC_RESET_RELEASE"), "SYNC"));
tg.config.add_enum(ebr + ".GSR", str_or_default(ci->params, ctx->id("GSR"), "DISABLED"));
tg.config.add_word(ebr + ".WID", int_to_bitvector(int_or_default(ci->attrs, ctx->id("WID"), 0), 9));
tg.config.add_word(ebr + ".WID",
int_to_bitvector(bit_reverse(int_or_default(ci->attrs, ctx->id("WID"), 0), 9), 9));
// Tie signals as appropriate
for (auto port : ci->ports) {
@ -558,14 +568,14 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
init_data.resize(2048, 0x0);
// INIT_00 .. INIT_3F
for (int i = 0; i <= 0x3F; i++) {
IdString param = ctx->id("INIT_" +
IdString param = ctx->id("INITVAL_" +
fmt_str(std::hex << std::uppercase << std::setw(2) << std::setfill('0') << i));
auto value = parse_init_str(str_or_default(ci->params, param, "0"), 320);
for (int j = 0; j < 16; j++) {
// INIT parameter consists of 16 18-bit words with 2-bit padding
int ofs = 20 * j;
for (int k = 0; k < 18; k++) {
if (init_data.at(ofs + k))
if (value.at(ofs + k))
init_data.at(i * 32 + j * 2 + (k / 9)) |= (1 << (k % 9));
}
}