Print timings at standard DDR3 speeds. This makes it easier to figure
out which memory modules will work well together.
---
eeprom/decode-dimms | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
Note : if anyone has SPD data for DDR3-1866 or DDR3-2133, please send
them to me so that I can test my code better.
--- i2c-tools.orig/eeprom/decode-dimms 2013-04-10 17:33:33.755706113 +0200
+++ i2c-tools/eeprom/decode-dimms 2013-04-10 21:53:08.674615604 +0200
@@ -1421,6 +1421,25 @@ sub decode_ddr3_sdram($)
}
printl("Supported CAS Latencies (tCL)", cas_latencies(keys %cas));
+# standard DDR3 speeds
+ prints("Timings at Standard Speeds");
+ foreach my $ctime_at_speed (7.5/8, 7.5/7, 1.25, 1.5, 1.875, 2.5) {
+ my $best_cas = $highestCAS;
+
+ # Find min CAS latency at this speed
+ for ($ii = 14; $ii >= 0; $ii--) {
+ next unless ($cas_sup & (1 << $ii));
+ if (ceil($taa / $ctime_at_speed) <= $ii + 4) {
+ $best_cas = $ii + 4;
+ }
+ }
+
+ printl_cond($ctime_at_speed >= $ctime,
+ "tCL-tRCD-tRP-tRAS" . as_ddr(3, $ctime_at_speed),
+ ddr_core_timings($best_cas, $ctime_at_speed,
+ $trcd, $trp, $tras));
+ }
+
# more timing information
prints("Timing Parameters");
--
Jean Delvare
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