CY7C68003
CLOCK
DATA[7:0]
DIR
STP
Figure 6. Sending RX CMD
Turn around RX CMD Turn around
Turn around RX CMD
RX CMD Turn around
NXT
USB Data Transmit (NOPID)
In this mode, the Link transmits data on the USB without a Packet Identifier (PID) by sending a TX CMD byte of the NOPID type.
TX2UL asserts NXT (see Figure 8 on page 11) in the first cycle of TX CMD and deasserts NXT when it detects STP to be high. Because
this command does not contain PID data, TX2UL waits for the next data byte before beginning transmission on the USB. When the
last byte is transferred by the TX2UL, the link asserts STP for one cycle and drives data to 00h if no transmit errors occur. The link
does not assert STP before the first byte is transferred by the TX2UL.
Figure 7. USB Data Transmit (NOPID)
CLOCK
DATA[7:0]
TX CMD (NOPID)
D0
D1
D2
DIR
STP
NXT
Document Number: 001-15775 Rev. *L
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