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Extend SDRAM Documentation to Cover GW2AR-18 Devices (#231)
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* Extend SDRAM documentation to cover GW2AR-18

* Extend SDRAM documentation to cover GW2AR-18

* Extend SDRAM documentation to cover GW2AR-18
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@Seyviour
Seyviour authored Feb 2, 2024
1 parent 8323bef commit baf9b1f
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141 changes: 101 additions & 40 deletions doc/sdram.md
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Expand Up @@ -11,43 +11,104 @@ This is what has been done in `/legacy/sdram`, which is a standalone script not

The result for GW1NR-9 is as below. A daring adventurer could use these to develop their own SDRAM controller or try to add support for LiteX on open source Gowin tools.

```
IO_sdram_dq(0) -> R29C26_IOA
IO_sdram_dq(1) -> R29C27_IOA
IO_sdram_dq(2) -> R29C35_IOA
IO_sdram_dq(3) -> R29C36_IOA
IO_sdram_dq(4) -> R29C37_IOA
IO_sdram_dq(5) -> R29C38_IOA
IO_sdram_dq(6) -> R29C39_IOA
IO_sdram_dq(7) -> R29C40_IOA
IO_sdram_dq(8) -> R29C16_IOB
IO_sdram_dq(9) -> R29C17_IOB
IO_sdram_dq(10) -> R29C18_IOA
IO_sdram_dq(11) -> R29C18_IOB
IO_sdram_dq(12) -> R29C19_IOB
IO_sdram_dq(13) -> R29C20_IOB
IO_sdram_dq(14) -> R29C21_IOB
IO_sdram_dq(15) -> R29C22_IOB
O_sdram_clk -> R1C4_IOB
O_sdram_cke -> R1C9_IOA
O_sdram_cs_n -> R1C35_IOB
O_sdram_cas_n -> R1C40_IOB
O_sdram_ras_n -> R1C40_IOA
O_sdram_wen_n -> R1C44_IOA
O_sdram_addr(0) -> R1C31_IOA
O_sdram_addr(1) -> R1C28_IOA
O_sdram_addr(2) -> R1C27_IOA
O_sdram_addr(3) -> R1C26_IOA
O_sdram_addr(4) -> R1C22_IOB
O_sdram_addr(5) -> R1C21_IOB
O_sdram_addr(6) -> R1C18_IOB
O_sdram_addr(7) -> R1C18_IOA
O_sdram_addr(8) -> R1C14_IOB
O_sdram_addr(9) -> R1C14_IOA
O_sdram_addr(10) -> R1C31_IOB
O_sdram_addr(11) -> R1C9_IOB
O_sdram_dqm(0) -> R1C44_IOB
O_sdram_dqm(1) -> R1C4_IOA
O_sdram_ba(0) -> R1C35_IOA
O_sdram_ba(1) -> R1C32_IOA
```
| SIGNAL NAME | PIN LOCATION |
| ---------------- | ------------ |
| IO_sdram_dq(0) | R29C26_IOA |
| IO_sdram_dq(1) | R29C27_IOA |
| IO_sdram_dq(2) | R29C35_IOA |
| IO_sdram_dq(3) | R29C36_IOA |
| IO_sdram_dq(4) | R29C37_IOA |
| IO_sdram_dq(5) | R29C38_IOA |
| IO_sdram_dq(6) | R29C39_IOA |
| IO_sdram_dq(7) | R29C40_IOA |
| IO_sdram_dq(8) | R29C16_IOB |
| IO_sdram_dq(9) | R29C17_IOB |
| IO_sdram_dq(10) | R29C18_IOA |
| IO_sdram_dq(11) | R29C18_IOB |
| IO_sdram_dq(12) | R29C19_IOB |
| IO_sdram_dq(13) | R29C20_IOB |
| IO_sdram_dq(14) | R29C21_IOB |
| IO_sdram_dq(15) | R29C22_IOB |
| O_sdram_clk | R1C4_IOB |
| O_sdram_cke | R1C9_IOA |
| O_sdram_cs_n | R1C35_IOB |
| O_sdram_cas_n | R1C40_IOB |
| O_sdram_ras_n | R1C40_IOA |
| O_sdram_wen_n | R1C44_IOA |
| O_sdram_addr(0) | R1C31_IOA |
| O_sdram_addr(1) | R1C28_IOA |
| O_sdram_addr(2) | R1C27_IOA |
| O_sdram_addr(3) | R1C26_IOA |
| O_sdram_addr(4) | R1C22_IOB |
| O_sdram_addr(5) | R1C21_IOB |
| O_sdram_addr(6) | R1C18_IOB |
| O_sdram_addr(7) | R1C18_IOA |
| O_sdram_addr(8) | R1C14_IOB |
| O_sdram_addr(9) | R1C14_IOA |
| O_sdram_addr(10) | R1C31_IOB |
| O_sdram_addr(11) | R1C9_IOB |
| O_sdram_dqm(0) | R1C44_IOB |
| O_sdram_dqm(1) | R1C4_IOA |
| O_sdram_ba(0) | R1C35_IOA |
| O_sdram_ba(1) | R1C32_IOA |


Similarly, the results for the GW2AR-18 are below. When the SDRAM is used, the Bank Voltage for banks 2 and 7 must be set to 3.3V. The ID jump from ```21``` to ```24``` is due to two address wires that are not used on the GW2AR-18.

| ID | SIGNAL NAME | IO | IO STANDARD | ASSOCIATED_PRIMITIVE |
| -- | ---------------- | ------ | ----------- | -------------------- |
| 1 | O_sdram_clk | IOR11B | LVCMOS33 | OBUF |
| 2 | O_sdram_cke | IOL13A | LVCMOS33 | OBUF |
| 3 | O_sdram_cs_n | IOL14B | LVCMOS33 | OBUF |
| 4 | O_sdram_cas_n | IOL14A | LVCMOS33 | OBUF |
| 5 | O_sdram_ras_n | IOL13B | LVCMOS33 | OBUF |
| 6 | O_sdram_wen_n | IOL12B | LVCMOS33 | OBUF |
| 7 | O_sdram_dqm[0] | IOL12A | LVCMOS33 | OBUF |
| 8 | O_sdram_dqm[1] | IOR11A | LVCMOS33 | OBUF |
| 9 | O_sdram_dqm[2] | IOL18A | LVCMOS33 | OBUF |
| 10 | O_sdram_dqm[3] | IOR15B | LVCMOS33 | OBUF |
| 11 | O_sdram_addr[0] | IOR14A | LVCMOS33 | OBUF |
| 12 | O_sdram_addr[1] | IOR13B | LVCMOS33 | OBUF |
| 13 | O_sdram_addr[2] | IOR14B | LVCMOS33 | OBUF |
| 14 | O_sdram_addr[3] | IOR15A | LVCMOS33 | OBUF |
| 15 | O_sdram_addr[4] | IOL16B | LVCMOS33 | OBUF |
| 16 | O_sdram_addr[5] | IOL17B | LVCMOS33 | OBUF |
| 17 | O_sdram_addr[6] | IOL16A | LVCMOS33 | OBUF |
| 18 | O_sdram_addr[7] | IOL17A | LVCMOS33 | OBUF |
| 19 | O_sdram_addr[8] | IOL15B | LVCMOS33 | OBUF |
| 20 | O_sdram_addr[9] | IOL15A | LVCMOS33 | OBUF |
| 21 | O_sdram_addr[10] | IOR12B | LVCMOS33 | OBUF |
| 24 | O_sdram_ba[0] | IOR13A | LVCMOS33 | OBUF |
| 25 | O_sdram_ba[1] | IOR12A | LVCMOS33 | OBUF |
| 26 | IO_sdram_dq[0] | IOL3A | LVCMOS33 | IOBUF |
| 27 | IO_sdram_dq[1] | IOL3B | LVCMOS33 | IOBUF |
| 28 | IO_sdram_dq[2] | IOL8A | LVCMOS33 | IOBUF |
| 29 | IO_sdram_dq[3] | IOL8B | LVCMOS33 | IOBUF |
| 30 | IO_sdram_dq[4] | IOL9A | LVCMOS33 | IOBUF |
| 31 | IO_sdram_dq[5] | IOL9B | LVCMOS33 | IOBUF |
| 32 | IO_sdram_dq[6] | IOL11A | LVCMOS33 | IOBUF |
| 33 | IO_sdram_dq[7] | IOL11B | LVCMOS33 | IOBUF |
| 34 | IO_sdram_dq[8] | IOR9B | LVCMOS33 | IOBUF |
| 35 | IO_sdram_dq[9] | IOR9A | LVCMOS33 | IOBUF |
| 36 | IO_sdram_dq[10] | IOR5B | LVCMOS33 | IOBUF |
| 37 | IO_sdram_dq[11] | IOR6A | LVCMOS33 | IOBUF |
| 38 | IO_sdram_dq[12] | IOR5A | LVCMOS33 | IOBUF |
| 39 | IO_sdram_dq[13] | IOR4B | LVCMOS33 | IOBUF |
| 40 | IO_sdram_dq[14] | IOR3B | LVCMOS33 | IOBUF |
| 41 | IO_sdram_dq[15] | IOR3A | LVCMOS33 | IOBUF |
| 42 | IO_sdram_dq[16] | IOL39B | LVCMOS33 | IOBUF |
| 43 | IO_sdram_dq[17] | IOL39A | LVCMOS33 | IOBUF |
| 44 | IO_sdram_dq[18] | IOL35B | LVCMOS33 | IOBUF |
| 45 | IO_sdram_dq[19] | IOL35A | LVCMOS33 | IOBUF |
| 46 | IO_sdram_dq[20] | IOL30B | LVCMOS33 | IOBUF |
| 47 | IO_sdram_dq[21] | IOL30A | LVCMOS33 | IOBUF |
| 48 | IO_sdram_dq[22] | IOL20A | LVCMOS33 | IOBUF |
| 49 | IO_sdram_dq[23] | IOL18B | LVCMOS33 | IOBUF |
| 50 | IO_sdram_dq[24] | IOR17A | LVCMOS33 | IOBUF |
| 51 | IO_sdram_dq[25] | IOR16A | LVCMOS33 | IOBUF |
| 52 | IO_sdram_dq[26] | IOR16B | LVCMOS33 | IOBUF |
| 53 | IO_sdram_dq[27] | IOR17B | LVCMOS33 | IOBUF |
| 54 | IO_sdram_dq[28] | IOR18A | LVCMOS33 | IOBUF |
| 55 | IO_sdram_dq[29] | IOR18B | LVCMOS33 | IOBUF |
| 56 | IO_sdram_dq[30] | IOR44A | LVCMOS33 | IOBUF |
| 57 | IO_sdram_dq[31] | IOR44B | LVCMOS33 | IOBUF |

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