diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.fsl-ddr | 74 |
1 files changed, 73 insertions, 1 deletions
diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr index 1657ef6..a7ba193 100644 --- a/doc/README.fsl-ddr +++ b/doc/README.fsl-ddr @@ -78,6 +78,13 @@ If the DDR controller supports address hashing, it can be enabled by hwconfig. Syntax is: hwconfig=fsl_ddr:addr_hash=true +Memory controller ECC on/off +============================ +If ECC is enabled in board configuratoin file, i.e. #define CONFIG_DDR_ECC, +ECC can be turned on/off by hwconfig. + +Syntax is +hwconfig=fsl_ddr:ecc=off Memory testing options for mpc85xx ================================== @@ -97,4 +104,69 @@ Combination of hwconfig Hwconfig can be combined with multiple parameters, for example, on a supported platform -hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3 +hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3,ecc=on + +Table for dynamic ODT for DDR3 +============================== +For single-slot system with quad-rank DIMM and dual-slot system, dynamic ODT may +be needed, depending on the configuration. The numbers in the following tables are +in Ohms. + +* denotes dynamic ODT + +Two slots system ++-----------------------+----------+---------------+-----------------------------+-----------------------------+ +| Configuration | |DRAM controller| Slot 1 | Slot 2 | ++-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+ +| | | | | | Rank 1 | Rank 2 | Rank 1 | Rank 2 | ++ Slot 1 | Slot 2 |Write/Read| Write | Read |-------+------+-------+------+-------+------+-------+------+ +| | | | | | Write | Read | Write | Read | Write | Read | Write | Read | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 75 | 120 | off | off | off | off | off | 30 | 30 | +| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 75 | off | off | 30 | 30 | 120 | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 75 | 120 | off | off | off | 20 | 20 | | | +| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 75 | off | off | 20 | 20 | 120 *| off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 75 | 120 *| off | | | off | off | 20 | 20 | +|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 75 | 20 | 20 | | | 120 | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 75 | 120 *| off | | | 30 | 30 | | | +|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 75 | 30 | 30 | | | 120 *| off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Dual Rank | Empty | Slot 1 | off | 75 | 40 | off | off | off | | | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Empty | Dual Rank | Slot 2 | off | 75 | | | | | 40 | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +|Single Rank| Empty | Slot 1 | off | 75 | 40 | off | | | | | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Empty |Single Rank| Slot 2 | off | 75 | | | | | 40 | off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ + +Single slot system ++-------------+------------+---------------+-----------------------------+-----------------------------+ +| | |DRAM controller| Rank 1 | Rank 2 | Rank 3 | Rank 4 | +|Configuration| Write/Read |-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Write | Read | Write | Read | Write | Read | Write | Read | Write | Read | ++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | R1 | off | 75 | 120 *| off | off | off | 20 | 20 | off | off | +| |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | R2 | off | 75 | off | 20 | 120 | off | 20 | 20 | off | off | +| Quad Rank |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | R3 | off | 75 | 20 | 20 | off | off | 120 *| off | off | off | +| |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | R4 | off | 75 | 20 | 20 | off | off | off | 20 | 120 | off | ++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | R1 | off | 75 | 40 | off | off | off | +| Dual Rank |------------+-------+-------+-------+------+-------+------+ +| | R2 | off | 75 | 40 | off | off | off | ++-------------+------------+-------+-------+-------+------+-------+------+ +| Single Rank | R1 | off | 75 | 40 | off | ++-------------+------------+-------+-------+-------+------+ + +Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf + http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf |