SNES Development
Data Pack Commands

Yes, the Data Pack have commands.

To do commands, you need to write some times : To do $C00000 = 0x38D0, you must write 0x38 first, then 0xD0. It’s a little weird, but that’s okay.

Type 1/3/4 commands:

$C00000 = If equal to :
          0x00   = Return to reading array data(? seems to be unreliable, 0xFF works better)
          0x0807 = copy vendor information block to current page
          0x10   = Program Byte (write $10 to $C00000; then write data to desired address)
          0x20D0 = Page Erase (write to $C10000 -> erase C10000-C1FFFF, etc.)
          0x38D0 = Reset Vendor Info to defaults.
          0x40   = Program Byte (same thing as above)
          0x50   = Clear Status Register
          0x70   = "finalize", must be used after flashing with command 0x10.
                   Otherwise an error 41 will occur.
                   It's also a Read CSR command.
          0x71   = Read Extended Status Registers (GSR and BSR)
          0x72   = Toggle "vendor info" page (toggles $C00004 between $x7 and $x6
                   and influences which data is shown on command 0x75)
          0x74   = Write "vendor info". Followed by one write to the desired address.
                   Changes are persistent until command 0x38D0 is issued (see above).
          0x75   = Show "vendor info". Vendor info as we know it is only shown when $C00004 is $x6.
                   Otherwise some other (unknown) data is shown.
          0x77D0 = Lock Page
          0x90   = Intelligent Identifier (Read two times to access to ID codes)
          0x97D0 = Upload Status Bits
          0x99D0 = Upload Device Info
          0xA7D0 = Chip Erase (NOT SUPPORTED in Type 3)
          0xB0D0 = Suspend/Resume Erase Process
          0xFF   = Return to reading array data

Type 2 commands:

$C02AAA = Written after first command for $C05555.
          xx = 55
$C05555 = If equal to :
          0xAAxx10 = Unknown
          0xAAxx30 = Unknown
          0xAAxx70 = Write Disabled
          0xAAxx80 = Unknown
          0xAAxxA0 = Vendor Info Access + Write Enabled
          0xAAxxF0 = Vendor Info Access, Read and Write disabled.

Reading flash area while any operation is pending will return a status byte in every address. e.g. after writing 0x20, flash data will read back “0x80” (or sometimes “0xB0”). Then, when writing 0xD0, flash data will read back “0x00” (or sometimes “0x30”) until the process is completed (so until the page is erased in this example).

Vendor Info

It appears at $C0FF00 :

$00 = Always 0x4D ?
$01 = 
$02 = Always 0x50 ?
$03 = 
$04 = 
$05 = 
$06 = Data Pack Type (0x1?=Type1, 0x2?=Type2, 0x3?=Type3, 0x4?=Type4) and Size (0x?8=2M; 0x?9=4M, 0x?A=8M, 0x?B=16M, 0x?C=32M)
$07 = 
$08 = 
$09 = 
$0A = 
$0B = 
$0C = 
$0D = 
$0E = 
$0F = 

Status Registers

Compatible Status Register (CSR)

Appears at any reads after using Read CSR command.

Bit(s) - Description
0-2 - Reserved
3   - Vpp Status
       1 = Vpp Low Detect, Operation Abort
       0 = Vpp OK
4   - Data Write Status
       1 = Error
       0 = Success
5   - Page Erase Status
       1 = Error
       0 = Success
6   - Erase Suspend Check
       1 = Suspended
       0 = In Progress/Done
7   - Write State Status
       1 = Ready to Write
       0 = Busy

Extended Status Registers

Global Status Register (GSR)

This register appears at $C0-FF:0004.

0   - Page Buffer (Vendor Info) Select Status
       1 = Page Buffer 1
       0 = Page Buffer 0
1   - Page Buffer Status
       1 = Selected Page Buffer Ready
       0 = Selected Page Buffer Busy
2   - Page Buffer Available Status
       1 = Available
       0 = Not Available
3   - Queue Status
       1 = Full
       0 = Available
4   - Device Sleep Status
       1 = In Sleep
       0 = Not in Sleep
5   - Device Operation Status
       1 = Unsuccessful
       0 = Successful
6   - Operation Suspend Status
       1 = Suspended
       0 = In Progress/Done
7   - Write State Machine Status
       1 = Ready
       0 = Busy

Page Status Register (BSR)

This register appears at $C0-FF:0002. (Depends of the page)

0-1 - Reserved
2   - Vpp Status
       1 = Vpp Low Detect, Operation Abort
       0 = Vpp OK
3   - Queue Status
       1 = Full
       0 = Available
4   - Block Operation Abort Status
       1 = Aborted
       0 = Not Aborted
5   - Block Operation Status
       1 = Unsuccessful
       0 = In Progress/Done
6   - Block Lock Status
       1 = Unlocked for Erase/Write
       0 = Locked for Erase/Write
7   - Block Status
       1 = Ready
       0 = Busy