USB97C100QFP datasheet(45/64 Pages) SMSC

45 / 64 page

SMSC DS – USB97C100

Page 45

Rev. 01/03/2001

SERIAL INTERFACE ENGINE (SIE) REGISTER DESCRIPTION

Packet Header Definition

The following header contains information to determine endpoint, status, length of the received packet, and the

payload “received data”.

Table 75 - Packet Header Definition

OFFSET

MSB 7

LSB 0

<n + 7

0x008

Payload Data Byte n-1 (n is the payload data size, which is Byte Count -8)

- For 0 Length Packet, Byte Count = 0x008

- For 1 byte Packet, Byte Count = 0x009

- For any Packet, (Byte Count-1) points to last byte of payload data

Payload Data Byte 0

0x007

BYTE COUNT[10..8]

0x006

BYTE COUNT[7..0]

0x005

EXTENDED FRAME COUNT[15..11]

FRAME COUNT[10..8]

0x004

FRAME COUNT[7..0]

0x003

RESERVED

0x002

TMP_ADDRESS[6..0]

0x001

PACKET ID[3..0]

0x000

Bad_CRC

Last_TOG

Bad_TOG

ENDPOINT[3..0]

Packet Description:

Offset 0 to 7 is the packet header.

Offset 0x000 to 0x005 is generated by the SIE.

Offset 0x000 bit bit 5 - Bad_TOG- This bit is set when the SIE receives an unexpected

toggle. This is not necessarily an error condition, This bit could indicate a condition when

the return handshake packet is lost .

Last Packet Toggle Value

Current Packet Toggle Value

“BAD TOG” bit

ii)

Offset 0x000 bit Last_TOG is the last toggle bit received.

iii)

Offset 0x000 bit Bad_CRC, is set when the SIE detects a bad CRC.

Offset 0x006 to 0x007 is generated by the SIEDMA.

Offset 8 to n+7 is the actual data received from the USB bus and stored in memory.

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