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authorBenoît Thébaudeau <benoit.thebaudeau@advansee.com>2013-01-30 11:19:18 +0000
committerStefano Babic <sbabic@denx.de>2013-02-12 13:52:31 +0100
commit7c92c540754a0c3756d467a9b0695f2a40d1fe86 (patch)
treeb237f8cf44bc076ecb3879f57db98f087be64490 /board/freescale
parentb42b5b7a243ab3923fd80ab03f950f036b6e1329 (diff)
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imx: mx6q DDR3 init: Benefit from available CL = 7
All the users of mx6q_4x_mt41j128.cfg (DDR3-1333H Micron MT41J128M16HA-15E or SK hynix H5TQ2G63BFR-H9C for i.MX6Q SABRE Lite, and DDR3-1600K Micron MT41K128M16JT-125:K for i.MX6 SABRE SD) support the optional down binning to DDR3-1066F (CL = 7, CWL = 6), which is possible at 532 MHz, so use it. In these conditions: tRCD(min) = 13.125 ns tRP(min) = 13.125 ns tRC(min) = max(tRAS(min, DDR3-1333H), tRAS(min, DDR3-1600K)) + tRP(min) tRAS(min, DDR3-1333H) = 36 ns tRAS(min, DDR3-1600K) = 35 ns MMDC1_MDCFG0.tCL should be set to 7 nCK, encoded as 0x4 in the bit-field MMDC1_MDCFG0[3:0]. MR0.CL should be set as in MMDC1_MDCFG0.tCL, i.e. to 7 nCK, which is encoded as 0x6 in MRS.LMR.MR0.{A6:A4, A2} and MMDC1_MDSCR[22:20, 18]. MMDC1_MDCFG1.tCWL should be set to 6 nCK, encoded as 0x4 in the bit-field MMDC1_MDCFG1[2:0]. MMDC1_MDCFG1.tRCD should be set to 13.125 ns, which is 7 nCK at 532 MHz, encoded as 0x6 in the bit-field MMDC1_MDCFG1[31:29]. MMDC1_MDCFG1.tRP should be set to 13.125 ns, which is 7 nCK at 532 MHz, encoded as 0x6 in the bit-field MMDC1_MDCFG1[28:26]. MMDC1_MDCFG1.tRC should be set to 49.125 ns, which is 27 nCK at 532 MHz, encoded as 0x1A in the bit-field MMDC1_MDCFG1[25:21]. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Diffstat (limited to 'board/freescale')
-rw-r--r--board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg8
1 files changed, 4 insertions, 4 deletions
diff --git a/board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg b/board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg
index d50858d..f4cae5e 100644
--- a/board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg
+++ b/board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg
@@ -109,8 +109,8 @@ DATA 4 0x021b4828 0x33333333
DATA 4 0x021b0018 0x00081740
DATA 4 0x021b001c 0x00008000
-DATA 4 0x021b000c 0x555A7975
-DATA 4 0x021b0010 0xFF538F64
+DATA 4 0x021b000c 0x555A7974
+DATA 4 0x021b0010 0xDB538F64
DATA 4 0x021b0014 0x01FF00DB
DATA 4 0x021b002c 0x000026D2
@@ -126,8 +126,8 @@ DATA 4 0x021b001c 0x00008033
DATA 4 0x021b001c 0x0000803B
DATA 4 0x021b001c 0x00428031
DATA 4 0x021b001c 0x00428039
-DATA 4 0x021b001c 0x19408030
-DATA 4 0x021b001c 0x19408038
+DATA 4 0x021b001c 0x19308030
+DATA 4 0x021b001c 0x19308038
DATA 4 0x021b001c 0x04008040
DATA 4 0x021b001c 0x04008048