notes:flashcart:ezflash5

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Table of Contents

EZ-Flash V programming
- Commands
- SRAM

EZ-Flash V programming

Commands

SRAM: Read byte (B7 01 aa aa aa 00 00 00)

Returns four bytes; the first byte is the read byte.

?? (B8 F2 00 00 nn 00 00 00)

nn = 00 ~ A2 (in increments of 2)

?? Write ASIC register ?? (B8 F4 ?? ?? ?? ?? ?? ??)

B8,F4,01,00,55,AA,55,00
B8,F4,02,06,55,AA,55,AA
B8,F4,01,04,55,AA,55,00

These may influence the behaviour of command B7.

B8,F4,03,03,55,AA,55,AA

In this mode, it appears that command B7 acts differently:

First, B7aaaaaaaa010000 is sent (prefetch?) - returns 4 bytes. The final byte may be FF or 00 - if it's 00, prefetch is complete.
Next, if prefetch was not complete, B7aaaaaaaa020000 is sent repeatedly - returns 4 bytes, same format as above.
Then, B7aaaaaaaa000000 is issued as normal.

It appears the cartridge runs a self-test of some kind for this?

TF: Write data (B8 F6 Fa Fb Fc Fd 00 00)

TF: Start data write (B8 F6 FF FF FF F0 00 00)

ab cd - bytes to write (sent as nibbles)

TF: Read 512 bytes (B8 F7 00 00 00 00 00 00)

TF: Read command byte? (B8 F8 00 00 00 00 00 00)

TF: Send command (B8 FA 00 cc pp pp pp pp)

TF: Read response (B8 FA nn 00 00 00 00 00)

nn - page to read (1-5).

?? Unlock ?? (B9 FF 55 AA 00 00 00 00)

?? Lock ?? (B9 FF A5 5A 00 00 00 00)

SRAM

0x7DFE0 - 1 if high-capacity TF card, 0 otherwise

notes/flashcart/ezflash5.1731010471.txt.gz · Last modified: 2024/11/07 20:14 by asie