MPC8280 datasheet(847/1386 Pages) FREESCALE

847 / 1386 page

Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

27-31

8–9

PID

Packet ID.

For OUT/SETUP transactions, this field is prepared by the user with the

following values:

0X Do not append PID to the data packet.

10 Transmit DATA0 PID before sending the data packet.

11 Transmit DATA1 PID before sending the data packet.

For IN transactions, this field is provided by the USB host controller with the

following values:

00 Buffer contains DATA0 packet.

01 Buffer contains DATA1 packet.

RXER1

Receive Error. This bit indicates that an error was detected while receiving the

data packet of an IN transaction. If RXER is 1, bits 11-15 have a different

meaning as explained below.

NAK/NO1

RXER=0: NAK received. Indicates that the endpoint has responded with a NAK

handshake (OUT transaction). The packet was received error-free; however,

the endpoint could not accept it.

RXER=1: Rx non-octet aligned packet. A packet that contained a number of

bits not exactly divisible by eight was received. Written by the USB controller

after the received data has been placed into the associated data buffer.

STAL/AB1

RXER=0: STALL received. Indicates that the endpoint has responded with a

STALL handshake (OUT transaction). The endpoint needs attention through

the control pipe.

RXER=1: Frame aborted. Bit stuff error occurred during reception. Written by

the USB controller after the received data has been placed into the associated

data buffer.

TO/CR1

RXER=0: Time out. Indicates that the endpoint failed to acknowledge the token

(IN transaction) or the data packet (OUT/SETUP transaction).

RXER=1: CRC error. This frame contains a CRC error. The received CRC

bytes are always written to the receive buffer. Written by the USB controller

after the received data has been placed into the associated data buffer.

UN/OV1

RXER=0: Underrun. Indicates that the USB encountered a transmit FIFO

underrun condition while sending the data packet (OUT/SETUP transaction).

RXER=1: Overrun. An internal receive FIFO overrun occurred during reception.

Written by the USB controller after the received data has been placed into the

associated data buffer.

BOV1

Buffer Overflow. IN transactions only. Indicates that the number of received

bytes is larger than the buffer size as provided in the Data Length field.

0x02

0–15

Data Length

For OUT/SETUP transactions, the user prepares this field with the number of

bytes to be sent from the data buffer. It will not be modified by the CP.

For IN transactions, the user prepares this field with the size of the data buffer,

which must be divisible by 4. The CP will return the actual number of bytes

written to the data buffer. If the number of received bytes, including the 2-byte

CRC, is larger than the data buffer, the BOV bit will be set by the CP.

Table 27-19. USB Host TrBD Fields (continued)

Offset

Bit

Name

Description

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