S1R72803F00A
54
EPSON
Address Register Name
Bit Symbol
R/W
Description
H.Rst S.Rst B.Rst
0x1F
IRM_Stat
7: NoIRM
R
0: Exist IRM Node
1: None IRM Node
6: WonIRM
R(W)
0: Other Node
1: Self Node
5: IRMID[5]
4: IRMID[4]
Physical ID of IRM Node
0x3F
–
0x3F
3: IRMID[3]
R
No exist IRM Node then IRMID=0x3F
2: IRMID[2]
1: IRMID[1]
0: IRMID[0]
Address Register Name
Bit Symbol
R/W
Description
H.Rst S.Rst B.Rst
0x1E
MaxRetry
7:
0:
1:
6:
0:
1:
5:
0:
1:
4:
0:
1:
0x00
0x00
–
3: maxRty[3]
Single Phase Retry Limit
2: maxRty[2]
R/W
Max Retry Count Value
1: maxRty[1]
If maxRty == 0, Single Phase Retry is ignore
0: maxRty[0]
Single Retry Limit Set Register
This register sets the number of retries of the Single Phase Retry protocol.
When its value is “0”, the Single Phase Retry is ignored.
Bit7..4 Reserved
Bit3..0 Single Retry Limit[3:0]
Sets the number of retries in the Single Phase at maxRtry[3:0]
IRM Status Register
This IRM Status Register controls detection of the Isochronous Resource Manager.
Bit7 No IRM
Sets whether an Isochronous Resource Manager exists on the serial bus. “1” indicates the IRM node does not exist and
“0” indicates the IRM node exists.
Bit6 WonIRM
Sets whether the Isochronous Resource Manager is self node or other node.
“1” indicates it is the self node and “0” indicates it is other node.
Usually, this bit is read-only. When a valid IRM is not detectable due to hardware bugs, however, the firmware
sets this bit through a Self-ID packet or topology map.
Bit5..0 IRM ID[5:0]
When the EnLrmDetect bit is “1”, the node ID of the Isochronous Resource Manager detected in the Self-ID
period is set. When no node corresponding to the IRM exists, it indicates the 0x3F value.
