SH7670 Datasheet, PDF (736/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Bit
Bit Name
4
PINGE
3

Initial
Value R/W Description
0
R/W PING Token Issue Enable
When the host controller function is selected,
setting this bit to 1 allows this module to issue the
PING token during transfers in the transmitting
direction and start a transfer in the transmitting
direction with the PING transaction.
0: Disables issuing PING token.
1: Enables normal PING operation.
When having detected the ACK handshake during
PING transactions, this module performs the OUT
transaction as the next transaction.
When having detected the NAK handshake during
OUT transactions, this module performs the PING
transaction as the next transaction.
When the host controller function is selected,
setting this bit to 0 through software prevents this
module from issuing the PING token during
transfers in the transmitting direction and only
allows this module to perform OUT transactions for
the transfers in the transmitting direction.
These bits should be modified while CSSTS is 0
and PID is NAK.
Before setting this bit to 1 after modifying the PID
bits for the corresponding 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 through software is not
necessary.
When the function controller function is selected, be
sure to write 0 to this bit.
0
R
Reserved
This bit is always read as 0. The write value should
always be 0.
Rev. 1.00 Nov. 14, 2007 Page 710 of 1262
REJ09B0437-0100