GL422/GL423 USB 2.0 +SD/MMC-controller Combo Solution

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3.2.3 EPFIFO

Endpoint FIFO: it includes Control FIFO (FIFO0), interrupt FIFO (FIFO3), Bulk In/Out FIFO (BULKFIFO)

3.2.3.1 Control FIFO

FIFO of control endpoint 0.

It is 64-byte FIFO, and it is used for endpoint 0 data transfer.

3.2.3.2 Interrupt FIFO 64-byte-depth FIFO of endpoint 3 for status interrupt.

3.2.3.3 Bulk In/Out FIFO

It can be in the TX mode or RX mode:

• It contains ping-pong FIFO (512 bytes each bank) for transmit/receive data continuously.

• It can be directly accessed by micro controller

• Support SIE won’t transmit data filled before micro controller check data integrity complete.

• It can be used to copy data block from source to destination in the same card or from one card to other

card.

3.2.4 MHE

It contains 3 MIF (Media Interface), control and MCFIFO

3.2.4.1 MIFs

• SD / MMC MIF

• Memory Stick MIF

• Memory Stick-PRO MIF

3.2.4.2 MCFIFO

32-byte FIFO shared by Memory Stick, Memory Stick-PRO, SD/MMC MIF.

• Memory Stick and Memory Stick-PRO MIF can use MCFIFO as command FIFO.

• SD/MMC MIF use MCFIFO for command and response.