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nb/intel/sandybridge: Correct description of QCLK 

QCLK means "quadrature clock", and is equivalent to one half of a full
clock cycle (tCK). Fix the comment. The `QCLK_PI` value is still valid.

Change-Id: I7089fc32381addc280a71761a377075f107b5c62
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49363
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Angel Pons 2021-01-12 21:08:27 +01:00 committed by Patrick Georgi
parent fc36e9fb0e
commit ec38570ead
1 changed files with 2 additions and 1 deletions
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src/northbridge/intel/sandybridge/raminit_common.h
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@ -433,7 +433,8 @@ typedef struct ramctr_timing_st {
#define MIN_CAS 4
/*
* 1 QCLK (quarter of a clock cycle) equals 64 PI (phase interpolator) ticks.
* 1 QCLK (quadrature clock) is one half of a full clock cycle (tCK).
* In addition, 64 PI (phase interpolator) ticks are equal to 1 QCLK.
* Logic delay values in I/O register bitfields are expressed in QCLKs.
*/
#define QCLK_PI 64