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liblitedram: discard singular 1s that are surrounded by 0s 

They are most likely glitches and won't be stable.

Signed-off-by: Maciej Dudek <mdudek@antmicro.com>
This commit is contained in:
Maciej Dudek 2023-01-25 11:38:13 +01:00 committed by Michal Sieron
parent cd89b62ff6
commit 3c02323cfe
1 changed files with 5 additions and 3 deletions
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8
litex/soc/software/liblitedram/sdram.c
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@ -415,7 +415,7 @@ static void sdram_leveling_center_module(
{ {
int i; int i;
int show; int show;
int working; int working, last_working;
unsigned int errors; unsigned int errors;
int delay, delay_mid, delay_range; int delay, delay_mid, delay_range;
int delay_min = -1, delay_max = -1, cur_delay_min = -1; int delay_min = -1, delay_max = -1, cur_delay_min = -1;
@ -425,9 +425,11 @@ static void sdram_leveling_center_module(
/* Find smallest working delay */ /* Find smallest working delay */
delay = 0; delay = 0;
working = 0;
rst_delay(module); rst_delay(module);
while(1) { while(1) {
errors = run_test_pattern(module); errors = run_test_pattern(module);
last_working = working;
working = errors == 0; working = errors == 0;
show = show_long; show = show_long;
#if SDRAM_PHY_DELAYS > 32 #if SDRAM_PHY_DELAYS > 32
@ -435,8 +437,8 @@ static void sdram_leveling_center_module(
#endif #endif
if (show) if (show)
print_scan_errors(errors); print_scan_errors(errors);
if(working && delay_min < 0) { if(working && last_working && delay_min < 0) {
delay_min = delay; delay_min = delay - 1; // delay on edges can be spotty
break; break;
} }
delay++; delay++;