CAT25320 EEPROM SPI Control for Rear Card ID

DPM128 (Dual Port Memory 128 byte) : Read/Write 8bit (128byte), Read/Write 16bit (64word)

Read from CAT25320, write to DPM128

1. Start Condition
   – Rear Card가 존재하는 경우 : Always
   – Rear Card가 새로 삽입되었을 경우
2. Process

(1) Send Read Command : b0000 0011 (8bit)

(2) Send Read Address : b0000 0000 0000 0000 0000 0000 (24bit)

(3) Continuously read 64 byte (1 Page)

(4) Write data to DPM128

Write to CAT25320, read from DPM128

1. Start Condition
   – DSP enable write process [R/W REG0(19)]
2. Process

(1) WREN for WIL bit 1 : write enable

(2) Send address 16bit (0x0000) : first data <– byte write

(3) Continuously write 32 byte data <– page write

(4) Send address 16bit (0x0020) : 33th byte

(5) Continuously write 32 byte data <– page write

(6) WRDS for WIL bit 0 : write disable