Renesas R5S72621 Manual De Usuario

 
Section 26   USB 2.0 Host/Function Module 

Page 1426 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

1, 0 

PID[1:0] 

00 

R/W 

Response PID 

Controls the response type of this module during 
control transfer. 

00: NAK response 

01: BUF response (depending on the buffer state) 

10: STALL response 

11: STALL response 

(1) When the host controller function is selected 

Modify the setting of these bits from NAK to 
BUF using the following procedure. 

  When the transmitting direction is set 

Write all the transmit data to the FIFO buffer 
while UACT is 1 and PID is NAK, and then set 
PID to BUF. After PID has been set to BUF, this 
module executes the OUT transaction (or PING 
transaction). 

  When the receiving direction is set 

Check that the FIFO buffer is empty (or empty 
the buffer) while UACT is 1 and PID is NAK, and 
then set PID to BUF. After PID has been set to 
BUF, this module executes the IN transaction. 

This module modifies the setting of these bits as 
follows. 

  This module sets PID to STALL (11) on 

receiving the data of the size exceeding the 

maximum packet size when PID has been set to 

BUF. 

  This module sets PID to NAK on detecting a 

receive error such as a CRC error three 

consecutive times. 

  This module also sets PID to STALL (11) on 

receiving the STALL handshake.