
Cypress Semiconductor Corporation
SL811HS and SL811HST: Application Notes
©2001 Cypress Semiconductor Corporation. All rights reserved. The information
and specifications contained in this document are subject to change without
notice.
Date: 07/26/01
Revision: 1.21
Page: 39
USB Trace 8: OUT Transaction from Host to Device
PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE
PACKET # SYNC DATA1 ZERO LENGTH PAYLOAD CRC16 EOP IDLE
PACKET # SYNC ACK EOP IDLE
5.1.3 Control Write
The SL811HS writes an OUT Token to the USB device, which always starts with DATA1 during
the Data phase. SL811HS toggles to DATA0 then DATA1 and so on.
USB Trace 9: OUT Transaction from Host to Device
To transfer 18-bytes from the host to device by Control transfer, it takes 3 OUT transactions
with 8-byte data payload.
PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE
PACKET # SYNC DATA1 8-BYTE DATA PAYLOAD CRC16 EOP IDLE
PACKET # SYNC ACK EOP IDLE
PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE
PACKET # SYNC DATA0 8-BYTE DATA PAYLOAD CRC16 EOP IDLE
PACKET # SYNC ACK EOP IDLE
PACKET # SYNC OUT ADDR ENDP CRC5 EOP IDLE
PACKET # SYNC DATA1 2-BYTE DATA PAYLOAD CRC16 EOP IDLE
PACKET # SYNC ACK EOP IDLE
The SL811HS send an IN Token during Control Write to initiate the Status Stage. The USB
device responds either by a handshake or a zero length data to indicate its current status.
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