ADM8511 datasheet(99/109 Pages) INFINEON

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ADM8511/X

APPENDIX 3 - USB Device OperationEndpoint 0

Data Sheet

Rev. 2.03, 2005-11-30

APPENDIX 3 - USB Device Operation

9.1

Endpoint 0

Endpoint 0 is in charge of response to standard USB commands and vendor specific commands. Internal registers

setting are also via this endpoint. The response to each command is described in section 7.

9.2

Endpoint 1 bulk IN

Endpoint 1 is in charge of sending the received Ethernet packet to USB host. An Ethernet packet will be split to

multiple 64-byte USB packets on USB. The end of the Ethernet packet is indicated by less then 64-byte or 0 length

data transfer in this pipe. The Ethernet received status is optionally reported at the end of the packet.

While accessing to this endpoint if RX FIFO is either full or any packet is inside, the data in RX FIFO is returned

in USB data stage. If ACK is received from USB host, data in RX FIFO is flushed. If no response or NAK is received

from USB host, the content in RX FIFO will be re-transmitted. If RX FIFO isn't ready for transmission, NAK is

returned to USB host.

Figure 16

Transmission of RX FIFO

The received status is reported as follows:

Table 41

Received status

Offset

Bit Field

Description

Offset0 7-0 rx_bytecnt_lo

The received byte count[7:0].

Offset1 3-0 rx_bytecnt_hi

The received byte count[11:8].

7-4 reserved

Offset2 0

Multicast_frame Indicate receive a multicast frame.

Long_pkt

Indicate received packet length > 1518 bytes

Runt_pkt

Indicate received packet length < 64 bytes.

crc_err

Indicate CRC check error.

Dribble_bit

Indicate packet length is not integer multiple of 8-bit.

7-5 reserved

Offset3 7-0 reserved

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