SPICARD Registers: Difference between revisions
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! Address | ! Address | ||
! Width | ! Width | ||
! RW | |||
! Used by | ! Used by | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_CNT|NSPI_CNT]] | ||
| 0x1000D800 | | 0x1000D800 | ||
| 4 | | 4 | ||
| RW | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_DONE|NSPI_DONE]] | ||
| 0x1000D804 | | 0x1000D804 | ||
| 4 | | 4 | ||
| RW | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_BLKLEN|NSPI_BLKLEN]] | ||
| 0x1000D808 | | 0x1000D808 | ||
| 4 | | 4 | ||
| RW | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_FIFO|NSPI_FIFO]] | ||
| 0x1000D80C | | 0x1000D80C | ||
| 4 | | 4 | ||
| RW | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_STATUS|NSPI_STATUS]] | ||
| 0x1000D810 | | 0x1000D810 | ||
| 4 | | 4 | ||
| R | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | | style="background: green" | Yes | ||
| | | [[#NSPI_AUTOPOLL|NSPI_AUTOPOLL]] | ||
| 0x1000D814 | |||
| 4 | |||
| RW | |||
| | |||
|- | |||
| style="background: green" | Yes | |||
| [[#NSPI_INT_MASK|NSPI_INT_MASK]] | |||
| 0x1000D818 | | 0x1000D818 | ||
| 4 | | 4 | ||
| W? | |||
| | | | ||
|- | |- | ||
| style="background: green" | Yes | |||
| [[#NSPI_INT_STAT|NSPI_INT_STAT]] | |||
| 0x1000D81C | |||
| 4 | |||
| RW | |||
| | |||
|} | |||
== NSPI_CNT == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0-2 | |||
| [[Filesystem_services#CardSpiBaudRate|Baud Rate]] | |||
|- | |||
| 6-7 | |||
| Unused device select. | |||
|- | |||
| 12 | |||
| [[Filesystem_services#CardSpiBusMode|Bus Mode]] | |||
|- | |||
| 13 | |||
| Transfer Mode (0 = read, 1 = write) | |||
|- | |||
| 15 | |||
| Trigger (0 = idle, 1 = busy) | |||
|} | |||
This register seems to have a bug where the lower 8 bits are shifted up by 16 when reading this register. | |||
== NSPI_DONE == | |||
Contains 1 when the SPI slave is selected. A 0 is written here on transfer end to deselect the slave. | |||
== NSPI_BLKLEN == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0-20 | |||
| Transfer size | |||
|- | |||
| 21-31 | |||
| Unused | |||
|} | |||
== NSPI_FIFO == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0-31 | |||
| Data | |||
|} | |||
This FIFO is one way (half-duplex). | |||
== NSPI_STATUS == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0 | |||
| FIFO Full (0 = not full, 1 = full) | |||
|} | |||
== NSPI_AUTOPOLL == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0-7 | |||
| Command | |||
|- | |||
| 16-19 | |||
| Timeout (Tries = 31<<Baudrate (from NSPI_CNT) + Timeout) | |||
|- | |||
| 24-26 | |||
| Bit offset (0-7) | |||
|- | |||
| 30 | |||
| Poll for a set or unset bit | |||
|- | |||
| 31 | |||
| 1 = Enable/Busy | |||
|} | |||
This automatically sends a command to the device and compares the specified bit in the response with bit 30 until it matches or a timeout occurs. Nintendo uses a timeout of 10 which roughly equals 1 second. This is used in Process9 to poll the gamecard SPI flash status register for write operation finished or write enable. | |||
== NSPI_INT_MASK == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0 | |||
| Transfer finished (1 = disabled) | |||
|- | |||
| 1 | |||
| Autopoll success (1 = disabled) | |||
|- | |||
| 2 | |||
| Autopoll timeout (1 = disabled) | |||
|} | |||
== NSPI_INT_STAT == | |||
{| class="wikitable" border="1" | |||
! BIT | |||
! DESCRIPTION | |||
|- | |||
| 0 | |||
| Transfer finished (also fires on each autopoll try?) | |||
|- | |||
| 1 | |||
| Autopoll success | |||
|- | |||
| 2 | |||
| Autopoll timeout | |||
|} | |} | ||
[[IRQ_Registers|Interrupt]] ID 23 is fired when any of the bits change to 1 except for interrupts masked in [[#NSPI_INT_MASK|NSPI_INT_MASK]]. Writing 1 to a bit in this register aknowledges the interrupt. | |||
Latest revision as of 00:08, 15 February 2021
Registers
| Old3DS | Name | Address | Width | RW | Used by |
|---|---|---|---|---|---|
| Yes | NSPI_CNT | 0x1000D800 | 4 | RW | |
| Yes | NSPI_DONE | 0x1000D804 | 4 | RW | |
| Yes | NSPI_BLKLEN | 0x1000D808 | 4 | RW | |
| Yes | NSPI_FIFO | 0x1000D80C | 4 | RW | |
| Yes | NSPI_STATUS | 0x1000D810 | 4 | R | |
| Yes | NSPI_AUTOPOLL | 0x1000D814 | 4 | RW | |
| Yes | NSPI_INT_MASK | 0x1000D818 | 4 | W? | |
| Yes | NSPI_INT_STAT | 0x1000D81C | 4 | RW |
NSPI_CNT
| BIT | DESCRIPTION |
|---|---|
| 0-2 | Baud Rate |
| 6-7 | Unused device select. |
| 12 | Bus Mode |
| 13 | Transfer Mode (0 = read, 1 = write) |
| 15 | Trigger (0 = idle, 1 = busy) |
This register seems to have a bug where the lower 8 bits are shifted up by 16 when reading this register.
NSPI_DONE
Contains 1 when the SPI slave is selected. A 0 is written here on transfer end to deselect the slave.
NSPI_BLKLEN
| BIT | DESCRIPTION |
|---|---|
| 0-20 | Transfer size |
| 21-31 | Unused |
NSPI_FIFO
| BIT | DESCRIPTION |
|---|---|
| 0-31 | Data |
This FIFO is one way (half-duplex).
NSPI_STATUS
| BIT | DESCRIPTION |
|---|---|
| 0 | FIFO Full (0 = not full, 1 = full) |
NSPI_AUTOPOLL
| BIT | DESCRIPTION |
|---|---|
| 0-7 | Command |
| 16-19 | Timeout (Tries = 31<<Baudrate (from NSPI_CNT) + Timeout) |
| 24-26 | Bit offset (0-7) |
| 30 | Poll for a set or unset bit |
| 31 | 1 = Enable/Busy |
This automatically sends a command to the device and compares the specified bit in the response with bit 30 until it matches or a timeout occurs. Nintendo uses a timeout of 10 which roughly equals 1 second. This is used in Process9 to poll the gamecard SPI flash status register for write operation finished or write enable.
NSPI_INT_MASK
| BIT | DESCRIPTION |
|---|---|
| 0 | Transfer finished (1 = disabled) |
| 1 | Autopoll success (1 = disabled) |
| 2 | Autopoll timeout (1 = disabled) |
NSPI_INT_STAT
| BIT | DESCRIPTION |
|---|---|
| 0 | Transfer finished (also fires on each autopoll try?) |
| 1 | Autopoll success |
| 2 | Autopoll timeout |
Interrupt ID 23 is fired when any of the bits change to 1 except for interrupts masked in NSPI_INT_MASK. Writing 1 to a bit in this register aknowledges the interrupt.