Dedicated Control Channel - Epson S2R72V18 Technical Manual

1.4.1.2

Dedicated Control Channel

This LSI uses a dedicated control channel (CH0) for control transfers. CH0 is therefore
time-multiplexed when used for control transfers to multiple endpoints.
Table 1-21 shows the basic settings for the dedicated control channel (CH0).
Item
Transfer speed
Toggle sequence bit
Transaction type
Max packet size
USB address
Endpoint number
Hub address
Port number
IRP data quantity
FIFO area
FIFO area join
Setup data
S2R72V18 Technical Manual (Rev.1.00)
Table 1-21 Dedicated control channel basic settings
Register/bit
H_CH0Config_0.SpeedMode
H_CH0Config_0.Toggle
H_CH0Config_1.TID
H_CH0MaxPktSize
H_CH0FuncAdrs.FuncAdrs
H_CH0FuncAdrs.EP_Number
H_CH0HubAdrs.HubAdrs
H_CH0HubAdrs.Port
H_CH0TotalSize_H,
H_CH0TotalSize _L
AREAn{n=0-5}StartAdrs_H,
AREAn{n=0-5}StartAdrs_L,
AREAn{n=0-5}EndAdrs_H,
AREAn{n=0-5}EndAdrs_L,
AREAn{n=0-5}Join_1.JoinEP0CH0
H_CH0SETUP_x(x=0-7)
Sets the transfer speed (HS/FS/LS) for
endpoints corresponding to channel CH0.
Sets the toggle sequence bit initial values when
starting a transaction. Also indicates the toggle
sequence bit status during or after a
transaction.
Sets the transaction type (SETUP/IN/OUT)
issued by channel CH0.
Sets the maximum packet size to 8 for LS
operation and 8, 16, 32, or 64 for FS operation.
Sets to 64 for HS operation.
Sets the USB address forming the destination
for the IRP to be executed by channel CH0.
Sets the endpoint number forming the
destination for the IRP to be executed by
channel CH0.
Sets the USB address for the hub used for split
transactions.
Sets the port number for the hub used for split
transactions.
Sets the quantity of data in bytes for the IRP to
be executed by channel CH0.
Sets the FIFO address for the area assigned to
channel CH0.
The FIFO area should be at least as large as
the max packet size for channel CH0. The FIFO
area size affects data transfer throughput.
For detailed information on FIFO area
assignments, refer to "1.6 FIFO Management."
Joins channel CH0 to the FIFO area.
Sets the 8-byte data to be sent by the setup
transaction.
EPSON
1. Functions
Description
47