MPC8280 datasheet(822/1386 Pages) FREESCALE

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Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

27-6

Freescale Semiconductor

Figure 27-3. USB Controller Operating Modes

Table 27-2. USB Tokens

Token

Description

OUT

Reception begins when an OUT token is received. The USB controller fetches the next BD associated

with the endpoint; if the BD is empty, the controller starts sending the incoming packet to the buffer. After

the buffer is full, the USB controller clears RxBD[E] and generates an interrupt if RxBD[I] = 1. If the

incoming packet is larger than the buffer, the USB controller fetches the next BD, and, if it is empty, sends

the rest of the packet to its buffer. The entire packet, including the DATA0/DATA1 PID, are written to the

receive buffers. Software must check data packet synchronization by monitoring the DATA0/DATA1 PID

sequence toggle.

If the packet reception has no CRC or bit stuff errors, the USB receiver sends the handshake selected in

the endpoint configuration register USEP

n[RHS] (see table below) to the host. If an error occurs, no

handshake packet is returned and error status bits are set in the last RxBD associated with this packet.

USB Out Token Reception

USEP

n[RHS]

Data Packet

Corrupted

Handshake Sent

to Host

Yes

None (data

discarded)

00 (Normal)

ACK

01 (Ignore)

None

10 (NAK)

NAK

11 (STALL)

STALL

Reset

Unenumerated

IDLE

Setup

Transmit

Receive

Start of frame

SETUP

token

OUT

token

SOF

token

Enumeration

process

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