Difference between revisions of "SPICARD Registers"

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!  Address
 
!  Address
 
!  Width
 
!  Width
 +
!  RW
 
!  Used by
 
!  Used by
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#REG_SPICARDCNT|REG_SPICARDCNT]]
+
| [[#NSPI_CNT|NSPI_CNT]]
 
| 0x1000D800
 
| 0x1000D800
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#REG_SPICARDASSERT|REG_SPICARDASSERT]]
+
| [[#NSPI_DONE|NSPI_DONE]]
 
| 0x1000D804
 
| 0x1000D804
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#REG_SPICARDSIZE|REG_SPICARDSIZE]]
+
| [[#NSPI_BLKLEN|NSPI_BLKLEN]]
 
| 0x1000D808
 
| 0x1000D808
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#REG_SPICARDFIFO|REG_SPICARDFIFO]]
+
| [[#NSPI_FIFO|NSPI_FIFO]]
 
| 0x1000D80C
 
| 0x1000D80C
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#REG_SPICARDFIFOSTAT|REG_SPICARDFIFOSTAT]]
+
| [[#NSPI_STATUS|NSPI_STATUS]]
 
| 0x1000D810
 
| 0x1000D810
 
| 4
 
| 4
 +
| R
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#NSPI_AUTOPOLL|NSPI_AUTOPOLL]]
 
| 0x1000D814
 
| 0x1000D814
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#NSPI_INT_MASK|NSPI_INT_MASK]]
 
| 0x1000D818
 
| 0x1000D818
 
| 4
 
| 4
 +
| W?
 
|
 
|
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#NSPI_INT_STAT|NSPI_INT_STAT]]
 
| 0x1000D81C
 
| 0x1000D81C
 
| 4
 
| 4
 +
| RW
 
|
 
|
 
|}
 
|}
  
−
== REG_SPICARDCNT ==
+
== NSPI_CNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
 
!  DESCRIPTION
 
!  DESCRIPTION
 
|-
 
|-
−
| 5-0
+
| 0-2
 
| [[Filesystem_services#CardSpiBaudRate|Baud Rate]]
 
| [[Filesystem_services#CardSpiBaudRate|Baud Rate]]
 +
|-
 +
| 6-7
 +
| Unused device select.
 
|-
 
|-
 
| 12
 
| 12
Line 74: Line 86:
 
|}
 
|}
  
−
== REG_SPICARDASSERT ==
+
This register seems to have a bug where the lower 8 bits are shifted up by 16 when reading this register.
−
When deasserting the card, this registers is set to 0. Presumably contains 1 when the card is asserted.
 
  
−
== REG_SPICARDSIZE ==
+
== 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"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
 
!  DESCRIPTION
 
!  DESCRIPTION
 
|-
 
|-
−
| 31-0
+
| 0-20
 
| Transfer size
 
| Transfer size
 +
|-
 +
| 21-31
 +
| Unused
 
|}
 
|}
  
−
== REG_SPICARDFIFO ==
+
== NSPI_FIFO ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
 
!  DESCRIPTION
 
!  DESCRIPTION
 
|-
 
|-
−
| 31-0
+
| 0-31
 
| Data
 
| Data
 
|}
 
|}
  
−
== REG_SPICARDFIFOSTAT ==
+
This FIFO is one way (half-duplex).
 +
 
 +
== NSPI_STATUS ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 103: Line 122:
 
| FIFO Full (0 = not full, 1 = full)
 
| 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[edit]

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[edit]

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[edit]

Contains 1 when the SPI slave is selected. A 0 is written here on transfer end to deselect the slave.

NSPI_BLKLEN[edit]

BIT DESCRIPTION
0-20 Transfer size
21-31 Unused

NSPI_FIFO[edit]

BIT DESCRIPTION
0-31 Data

This FIFO is one way (half-duplex).

NSPI_STATUS[edit]

BIT DESCRIPTION
0 FIFO Full (0 = not full, 1 = full)

NSPI_AUTOPOLL[edit]

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[edit]

BIT DESCRIPTION
0 Transfer finished (1 = disabled)
1 Autopoll success (1 = disabled)
2 Autopoll timeout (1 = disabled)

NSPI_INT_STAT[edit]

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.

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