Section 23
USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1161 of 1588
REJ09B0313-0050
(4) Response PID
The PID bits in DCPCTR and PIPEnCTR are used to set the response PID for each pipe.
The following shows this module operation with various response PID settings:
•
Response PID settings when the host controller function is selected:
The response PID is used to specify the execution of transactions.
A. NAK setting: Using pipes is disabled. No transaction is executed.
B. BUF setting: Transactions are executed based on the status of the buffer memory.
For OUT direction: If there are transmit data in the buffer memory, an OUT token is
issued.
For IN direction: If there is an area to receive data in the buffer memory, an IN token is
issued.
C. STALL setting: Using pipes is disabled. No transaction is executed.
Setup transactions for the DCP are set with the SUREQ bit.
•
Response PID settings when the function controller function is selected:
The response PID is used to specify the response to transactions from the host.
A. NAK setting: The NAK response is always returned in response to the generated
transaction.
B. BUF setting: Responses are made to transactions based on the status of the buffer memory.
C. STALL setting: The STALL response is always returned in response to the generated
transaction.
For setup transactions, an ACK response is always returned, regardless of the PID setting, and the
USB request is stored in the register.
This module may carry out writing to the PID bits, depending on the results of the transaction.
•
When the host controller function has been selected and the response PID is set by hardware:
A. NAK setting: In the following cases, PID = NAK is set and issuing of tokens is
automatically stopped:
•
When a transfer other than isochronous transfer has been performed and no response is
returned to the issued token.
•
When a corrupted packet is received in response to the transmitted token.
•
When a short packet is received in the data stage of a control read transfer.
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 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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