Renesas R5S72625 Manual Do Utilizador

 

Section 26   USB 2.0 Host/Function Module 

R01UH0134EJ0400  Rev. 4.00  

 

Page 1437 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

14 to 10  BUFSIZE[4:0] 

H'00 

R/W 

Buffer Size 

Specifies the size of the buffer for the pipe selected 
by the PIPESEL bits (selected pipe) in terms of 
blocks, where one block comprises 64 bytes.  

00000 (H'00): 64 bytes 

00001 (H'01): 128 bytes 

  :             : 

11111 (H'1F): 2 Kbytes 

When the DBLB bit has been set to 1, this module 
assigns two planes of the FIFO buffer size specified 
by the BUFSIZE bits to the selected pipe. 

Specifically, the following expression determines the 
FIFO buffer size assigned to the selected pipe by this 
module. 

(BUFSIZE + 1) 

 64  (DBLB + 1) [bytes] 

The valid value for these bits depends on the 
selected pipe. 
  PIPE1 to PIPE5: Any value from H'00 to H'1F is 

valid. 

  PIPE6 to PIPE9: H'00 should be set. 
When used with CNTMD = 1, set an integer multiple 
of the maximum packet size to the BUFSIZE bits. 

Modify these bits when the value of CSSTS is 0, the 
PID bits are set to NAK, and no pipe is specified by 
the CURPIPE bits. 

Before modifying these bits after modifying the PID 
bits for the selected pipe from BUF to NAK, check 
that CSSTS and PBUSY are 0. However, if the PID 
bits have been modified to NAK by this module, 
checking PBUSY is not necessary. 

9 to 7 

 All 

0 

R 

Reserved 

These bits are always read as 0. The write value 
should always be 0.