MPC8280 datasheet(841/1386 Pages) FREESCALE

841 / 1386 page

Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

27-25

Data length represents the number of octets that the CP has written into this BD’s buffer. It is written once

by the CP as the BD is closed.

Interrupt

0 No interrupt is generated after this buffer has been filled.

1 The RXB bit in the USB event register will be set when this buffer has been

completely filled by the CP, indicating the need for the CPU core to process the

buffer. The RXB bit can cause an interrupt if it is enabled.

Last. This bit is set by the USB controller when the buffer is closed due to detection

of end-of-packet condition on the bus, or as a result of error. Written by the USB

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

0 Buffer does not contain the last byte of the message.

1 Buffer contains the last byte of the message.

First. This bit is set by the USB controller when the buffer contains the first byte of a

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

associated data buffer.

0 Buffer does not contain the first byte of the message

1 Buffer contains the first byte of the message

6–7

—

Reserved, should be cleared

8–9

PID

Packet ID. This bit field is set by the USB controller to indicate the type of the packet.

This bit is valid only if the USB RXBD[F] is set. Written by the USB controller after the

received data has been placed into the associated data buffer.

00 Buffer contains DATA0 packet

01 Buffer contains DATA1 packet

10 Buffer contains SETUP packet. This option can never be set on host RxBD

—

Reserved, should be cleared

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.

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.

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.

Overrun. A receiver overrun occurred during reception. Written by the USB controller

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

—

Reserved, should be cleared

0x02

0–15

Data length

Data length is the number of octets that the CP has written into this BD’s data buffer.

It is written once by the CP as the BD is closed.

Note: The actual amount of memory allocated for this buffer should be greater than

or equal to the contents of the MRBLR.

0x04

0–31

Rx data

buffer

pointer

The receive buffer pointer, which always points to the first location of the associated

data buffer, must be divisible by 4. The buffer may reside in either internal or external

memory

Table 27-16. USB Rx BD Fields (continued)

Offset

Bit

Name

Description

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