Section 23
USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1183 of 1588
REJ09B0313-0050
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 23.20 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 23.20 NYET Handshake Responses
Value Set
for PID Bit in
DCPCTR
Buffer
Memory
State Token
Response
Note
NAK/STALL
SETUP
ACK
IN/OUT/
PING
NAK/STALL
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.
Содержание Single-Chip Microcomputer SH7203
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Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
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Страница 1226: ...Section 23 USB 2 0 Host Function Module USB Rev 0 50 May 18 2006 Page 1196 of 1588 REJ09B0313 0050 ...
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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