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Cypress Semiconductor Corporation

SL811HS and SL811HST: Application Notes

and specifications contained in this document are subject to change without

notice.

Date: 07/26/01

Revision: 1.21

Page: 40

5.2. Bulk Transfer

The Bulk pipe includes the Token (IN, OUT), Data (DATA0/DATA1), and Handshake (ACK,

NAK, STALL) phases. The USB defines the allowable maximum control data payload sizes for

full-speed devices to be 8, 16, 32 or 64 bytes. However, low speed devices are limited to an 8-

byte maximum data payload size.

5.2.1 BULK Write

The BULK Write endpoint’s toggle sequence is initialized to DATA0/DATA1 and so on.

USB Trace 10: Bulk Write

To transfer 512-bytes from host to device by BULK transfer, it takes 8 OUT transactions with a

64-byte data payload.

PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE

PACKET # SYNC DATA0 DATA PAYLOAD CRC16 EOP IDLE

PACKET # SYNC ACK EOP IDLE

PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE

PACKET # SYNC DATA1 DATA PAYLOAD CRC16 EOP IDLE

PACKET # SYNC ACK EOP IDLE

…

PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE

PACKET # SYNC DATA0 DATA PAYLOAD CRC16 EOP IDLE

PACKET # SYNC ACK EOP IDLE

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Cypress Semiconductor SL811HS Bedienungsanleitung Seite 40