Visible to Intel only — GUID: baz1692293720155
Ixiasoft
Visible to Intel only — GUID: baz1692293720155
Ixiasoft
2.3.1. Example: DQ Pin Swizzling Within DQS group for x32 DDR4 interface
Example: DQ Pin Swizzling Within DQS group for x32 DDR4 interface
This example uses the lane placement of the following table, using a memory device of x8 width.
Lane Number | BL0 | BL1 | BL2 | BL3 | BL4 | BL5 | BL6 | BL7 |
---|---|---|---|---|---|---|---|---|
Default placement | DQ[0] | AC0 | AC1 | AC2 | DQ[1] | DQ[2] | DQ[3] | GPIO |
Lane | Pin Index | DDR4 x32 (Default Placement) | After Swizzling / Swapping |
---|---|---|---|
BL0 | 11 | MEM_DQ[7] | MEM_DQ[6] |
10 | MEM_DQ[6] | MEM_DQ[5] | |
9 | MEM_DQ[5] | MEM_DQ[7] | |
8 | MEM_DQ[4] | MEM_DQ[4] | |
7 | |||
6 | MEM_DM_N[0] | MEM_DM_N[0] | |
5 | MEM_DQS_C[0] | MEM_DQS_C[0] | |
4 | MEM_DQS_T[0] | MEM_DQS_T[0] | |
3 | MEM_DQ[3] | MEM_DQ[0] | |
2 | MEM_DQ[2] | MEM_DQ[2] | |
1 | MEM_DQ[1] | MEM_DQ[1] | |
0 | MEM_DQ[0] | MEM_DQ[3] |
To achieve this swizzling in DQS group 0, you must enter PIN_SWIZZLE_CH0_DQS0=3,1,2,0,4,7,5,6; in the User Extra Parameters field of the Additional Parameters tab in the Advanced Parameters section of the General IP Parameters tab in the External Memory Interfaces IP parameter editor.
![](/content/dam/docs/us/en/772632/23-4-6-0-0/xph1692208210277.png)
Lane | Pin Index | DDR4 x32 (from table) | After Swizzling / Swapping |
---|---|---|---|
BL5 | 71 | MEM_DQ[23] | MEM_DQ[17] |
70 | MEM_DQ[22] | MEM_DQ[22] | |
69 | MEM_DQ[21] | MEM_DQ[21] | |
68 | MEM_DQ[20] | MEM_DQ[20] | |
67 | |||
66 | MEM_DM_N[2] | MEM_DM_N[2] | |
65 | MEM_DQS_C[2] | MEM_DQS_C[2] | |
64 | MEM_DQS_T[2] | MEM_DQS_T[2] | |
63 | MEM_DQ[19] | MEM_DQ[19] | |
62 | MEM_DQ[18] | MEM_DQ[18] | |
61 | MEM_DQ[17] | MEM_DQ[23] | |
60 | MEM_DQ[16] | MEM_DQ[16] |
To achieve this swizzling in DQS Group 2, you must enter PIN_SWIZZLE_CH0_DQS2=16,23,18,19,20,21,22,17; in the User Extra Parameters field of the Additional Parameters tab in the Advanced Parameters section of the General IP Parameters tab in the External Memory Interfaces IP parameter editor.
![](/content/dam/docs/us/en/772632/23-4-6-0-0/dbh1692209651068.png)
You can enter multiple specifications in the User Extra Parameters field, each separated by a comma.
![](/content/dam/docs/us/en/772632/23-4-6-0-0/prg1692211227486.png)