USB97C102 datasheet(52/80 Pages) SMSC

52 / 80 page

SMSC DS – USB97C102

Page 52

Rev. 03/23/2000

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 94 - 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_CR

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.

iii) 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. Note that this bit is not set for isochronous transfers.

LAST PACKET TOGGLE

VALUE

CURRENT PACKET

TOGGLE VALUE

“BAD TOG” BIT

iii) 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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