MPC8536-RDK Freescale Semiconductor, MPC8536-RDK Datasheet - Page 1464

Manufacturer Part Number

BOARD REF COMEXPRESS MPC8536

Manufacturer

Freescale Semiconductor

PowerQUICC ™r

CSB1880, CSB1801, Cables, Documentation, Enclosure, Power Supply with cord

For Use With/related Products

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Universal Serial Bus Interfaces

The behaviors of the device controller for interrupt and bulk endpoints are identical. All valid IN and OUT

transactions to bulk pipes will handshake with a NAK unless the endpoint had been primed. Once the

endpoint has been primed, data delivery will commence.

A dTD will be retired by the device controller when the packets described in the transfer descriptor have

been completed. Each dTD describes N packets to be transferred according to the USB Variable Length

transfer protocol. The formula and table on the following page describe how the device controller

computes the number and length of the packets to be sent/received by the USB vary according to the total

number of bytes and maximum packet length.

With Zero Length Termination (ZLT) = 0

With Zero Length Termination (ZLT) = 1

TX-dTD is complete when:

RX-dTD is complete when:

All packets described dTD were successfully transmitted. *** Total bytes in dTD will equal zero

when this occurs.

All packets described in dTD were successfully received. *** Total bytes in dTD will equal zero

when this occurs.

N = INT(number of bytes/max. packet length) + 1

N = MAXINT(number of bytes/max. packet length)

Interrupt/Bulk Endpoint Operational Model

The MULT field in the dQH must be set to ‘00’ for bulk, interrupt, and

control endpoints.

MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1

Table 21-85. Variable Length Transfer Protocol Example (ZLT = 0)

Table 21-86. Variable Length Transfer Protocol Example (ZLT = 1)

Freescale Semiconductor