DM9621 datasheet(42/66 Pages) DAVICOM

42 / 66 page

DM9621

USB2.0 to Fast Ethernet Controller

Preliminary

Version: DM9621 -14-DS-P02

February 23, 2011

7.1.3 Interface 0 Configuration

Definition: len-byte is 64-byte in full speed mode and 256-byte in high speed mode.

Endpoint 1

Type: Bulk In

Packet Padload: len-byte

When host accessing EP1.

If IN-FIFO is full, device will send len-byte data.

If IN-FIFO isn’t full and Ethernet packet isn’t end, device will send a NAK.

If IN-FIFO isn’t full and Ethernet packet is end, device will send the surplus data in IN-FIFO.

Data Format

For 3-byte header mode

Fist byte

: Ethernet Receive Packet Status, the bit format is same as register 6 (RSR)

Second byte : Ethernet Receive Packet byte count low

Third byte

: Ethernet Receive Packet byte count high

The others

: Ethernet Receive Packet Data

For 4-byte header mode

(if pin GPIO2_2 is pull-high)

Fist byte

: Ethernet Receive Packet Checksum Status, the bit[7:2] format is same as register 32H

(RCSCSR)

Second byte

: Ethernet Receive Packet Status, the bit format is same as register 6 (RSR)

Third byte

: Ethernet Receive Packet byte count low

Fourth byte

: Ethernet Receive Packet byte count high

The others

: Ethernet Receive Packet Data

Endpoint 2

Type: Bulk Out

Packet Padload: len-byte

When host accessing EP2.

If OUT-FIFO isn’t full, host sends data, device response ACK.

If OUT-FIFO is full, host sends data, device response NAK.

If host sends data less len-byte or zero byte, it means Ethernet packet end.

Data Format

First byte

: Ethernet Transmit Packet byte count low

Second byte

: Ethernet Transmit Packet byte count high

The others

: Ethernet Transmit Packet data

Endpoint 3

Type: Interrupt In

Packet Load: 8-byte

When host accessing EP3.

If no interrupt condition, device response NAK.

If interrupt condition, device will send content back to host.

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