SH7263 Datasheet, PDF (1383/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 25 USB 2.0 Host/Function Module (USB)
8. Sends a PING packet.
This controller is returned to PING packet sending mode by a power-on reset, a software reset,
receiving a NYET/NAK handshake, setting or clearing the sequence toggle bits (SQSET and
SQCLR), and setting the buffer clear bit (ACLRM) in PIPEnCTR.
(2) NYET Handshake Control when the Function Controller Function is Selected
Table 25.23 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 25.23 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-BRDY IN
NAK
TRN-NRDY
[Legend]
RCV-BRDY1: When an OUT/PING token is received, there is space in the buffer memory for two or
more packets.
RCV-BRDY2: When an OUT token is received, there is only enough space in the buffer memory for
one packet.
RCV-NRDY: When a PING token is received, there is no space in the buffer memory.
TRN-BRDY: When an IN token is received, there is data to be sent in the buffer memory.
TRN-NRDY: When an IN token is received, there is no data to be sent in the buffer memory.
Rev. 2.00 Mar. 14, 2008 Page 1349 of 1824
REJ09B0290-0200