Print DDR core timings for all supported CAS values.
---
eeprom/decode-dimms | 39 +++++++++++++++++++++++++--------------
1 file changed, 25 insertions(+), 14 deletions(-)
--- i2c-tools.orig/eeprom/decode-dimms 2012-10-19 14:08:56.000000000 +0200
+++ i2c-tools/eeprom/decode-dimms 2012-10-19 15:19:46.620456787 +0200
@@ -830,6 +830,14 @@ sub decode_sdr_sdram($)
(($bytes->[35] >> 7) ? -$temp : $temp) . " ns");
}
+sub ddr_core_timings($$$$$)
+{
+ my ($cas, $ctime, $trcd, $trp, $tras) = @_;
+
+ return $cas . "-" . ceil($trcd/$ctime) . "-" . ceil($trp/$ctime) .
+ "-" . ceil($tras/$ctime) . " as DDR" . int(2000 / $ctime);
+}
+
# Parameter: EEPROM bytes 0-127 (using 3-62)
sub decode_ddr_sdram($)
{
@@ -843,8 +851,8 @@ sub decode_ddr_sdram($)
# speed
prints("Memory Characteristics");
- $temp = ($bytes->[9] >> 4) + ($bytes->[9] & 0xf) * 0.1;
- my $ddrclk = 2 * (1000 / $temp);
+ my $ctime = ($bytes->[9] >> 4) + ($bytes->[9] & 0xf) * 0.1;
+ my $ddrclk = 2 * (1000 / $ctime);
my $tbits = ($bytes->[7] * 256) + $bytes->[6];
if (($bytes->[11] == 2) || ($bytes->[11] == 1)) { $tbits = $tbits - 8; }
my $pcclk = int ($ddrclk * $tbits / 8);
@@ -893,18 +901,11 @@ sub decode_ddr_sdram($)
my $trcd;
my $trp;
my $tras;
- my $ctime = ($bytes->[9] >> 4) + ($bytes->[9] & 0xf) * 0.1;
$trcd = ($bytes->[29] >> 2) + (($bytes->[29] & 3) * 0.25);
$trp = ($bytes->[27] >> 2) + (($bytes->[27] & 3) * 0.25);
$tras = $bytes->[30];
- printl("tCL-tRCD-tRP-tRAS",
- $highestCAS . "-" .
- ceil($trcd/$ctime) . "-" .
- ceil($trp/$ctime) . "-" .
- ceil($tras/$ctime));
-
# latencies
printl("Supported CAS Latencies", cas_latencies(keys %cas));
@@ -925,28 +926,38 @@ sub decode_ddr_sdram($)
printl("Supported WE Latencies", $temp);
# timings
- my ($cycle_time, $access_time);
+ my ($cycle_time, $access_time, $core_timings);
if (exists $cas{$highestCAS}) {
+ $core_timings = ddr_core_timings($highestCAS, $ctime,
+ $trcd, $trp, $tras);
+
$cycle_time = "$ctime ns at CAS $highestCAS";
$access_time = (($bytes->[10] >> 4) * 0.1 + ($bytes->[10] &
0xf) * 0.01)
. " ns at CAS $highestCAS";
}
if (exists $cas{$highestCAS-0.5} && spd_written(@$bytes[23..24])) {
- $cycle_time .= "\n".(($bytes->[23] >> 4) + ($bytes->[23] & 0xf)
* 0.1)
- . " ns at CAS ".($highestCAS-0.5);
+ $ctime = ($bytes->[23] >> 4) + ($bytes->[23] & 0xf) * 0.1;
+ $core_timings .= "\n".ddr_core_timings($highestCAS-0.5, $ctime,
+ $trcd, $trp, $tras);
+
+ $cycle_time .= "\n$ctime ns at CAS ".($highestCAS-0.5);
$access_time .= "\n".(($bytes->[24] >> 4) * 0.1 + ($bytes->[24]
& 0xf) * 0.01)
. " ns at CAS ".($highestCAS-0.5);
}
if (exists $cas{$highestCAS-1} && spd_written(@$bytes[25..26])) {
- $cycle_time .= "\n".(($bytes->[25] >> 4) + ($bytes->[25] & 0xf)
* 0.1)
- . " ns at CAS ".($highestCAS-1);
+ $ctime = ($bytes->[25] >> 4) + ($bytes->[25] & 0xf) * 0.1,
+ $core_timings .= "\n".ddr_core_timings($highestCAS-1, $ctime,
+ $trcd, $trp, $tras);
+
+ $cycle_time .= "\n$ctime ns at CAS ".($highestCAS-1);
$access_time .= "\n".(($bytes->[26] >> 4) * 0.1 + ($bytes->[26]
& 0xf) * 0.01)
. " ns at CAS ".($highestCAS-1);
}
+ printl_cond(defined $core_timings, "tCL-tRCD-tRP-tRAS", $core_timings);
printl_cond(defined $cycle_time, "Minimum Cycle Time", $cycle_time);
printl_cond(defined $access_time, "Maximum Access Time", $access_time);
printl_cond($bytes->[43] & 0xfc,
--
Jean Delvare
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
