SH7764 Datasheet, PDF (1040/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 21 USB 2.0 Host/Function Module (USB)
(2) NYET Handshake Control when the Function Controller Function is Selected
Table 21.27 shows the NYET handshake responses of this module. The NYET response of this
module is made in conformance with the conditions noted below. When a short packet is received,
however, the response will be an ACK response instead of a NYET packet response. The same
applies to the data stages of control write transfers.
Table 21.27 NYET Handshake Responses
Value Set Buffer
for PID Bit in Memory
DCPCTR State
Token
Response
Note
NAK/STALL 
SETUP
ACK


IN/OUT/
NAK/STALL 
PING
BUF

SETUP
ACK

RCV-BRDY1 OUT/PING ACK
If an OUT token is received, a data
packet is received.
RCV-BRDY2 OUT
NYET
Notifies whether a data packet can
be received
RCV-BRDY2 OUT (Short) ACK
Notifies whether a data packet can
be received
RCV-BRDY2 PING
ACK
Notifies that a data packet can be
received
RCV-NRDY OUT/PING NAK
Notifies that a data packet cannot be
received
TRN-BRDY IN
DATA0/DATA1 A data packet is transmitted
TRN-NRDY IN
NAK
TRN-NRDY
[Legend]
RCV-BRDY1:
RCV-BRDY2:
RCV-NRDY:
TRN-BRDY:
TRN-NRDY:
When an OUT/PING token is received, there is space in the buffer memory for two
or more packets.
When an OUT token is received, there is only enough space in the buffer memory
for one packet.
When a PING token is received, there is no space in the buffer memory.
When an IN token is received, there is data to be sent in the buffer memory.
When an IN token is received, there is no data to be sent in the buffer memory.
Rev. 1.00 Nov. 22, 2007 Page 984 of 1692
REJ09B0360-0100