MPC8280 datasheet(835/1386 Pages) FREESCALE

835 / 1386 page

Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

27-19

Enable multi-frame. For USB function controller

allows loading of the next transmit packet into the

FIFO before transmission completion of the

previous packet.

0 Transmit FIFO may hold only one packet

1 Transmit FIFO may hold more than one packet

Note: For USB function configuration: Should be

cleared unless the endpoint is configured for

ISO transfer mode.

Enable multi-frame for USB host controller. Should

be always set.

RTE

Retransmit enable for USB function controller

0 No retransmission

1 Automatic frame retransmission is enabled. The

frame will be retransmitted if transmit error

occurred (time-out).

Note: May be set only if the transmit packet is

contained in a single buffer. If it is not,

retransmission should be handled by

software intervention.

Note: Should be set to zero for endpoint which is

configured for ISO transfer mode

Transaction-level interface for USB host controller.

0 Packet-level interface as described in

Section 27.5.1.1, “Packet-Level Interface.”

1 Transaction-level interface as described in

Section 27.5.1.2, “Transaction-Level Interface.”

12–13

THS

Transmit hand shake for USB function controller.

This field determines the response to an IN

transaction.

00 Normal handshake

01 Ignore IN token

10 Force NACK handshake. Not allowed for control

endpoint.

11 Force STALL handshake. On a control endpoint

this value is used to generate a protocol stall;

in this case THS will be cleared by the USB

function controller when a SETUP token is

received.

Transmit hand shake for USB host controller

00 Normal handshake

14–15

RHS

Receive hand shake for USB function controller.

This field determines the response to an OUT

transaction.

00 Normal handshake

01 Ignore OUT token

10 Force NACK handshake and discard the data.

This value may be used for flow control. Not

allowed for control endpoint.

11 Force STALL handshake. On a control endpoint

this value is used to generate a protocol stall;

in this case RHS will be cleared by the USB

function controller when a SETUP token is

received.

Receive hand shake for USB host controller

00 Normal handshake

Table 27-11. USEPx Field Descriptions (continued)

Bits

Name

USB Function Mode

USB Host Mode

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