Product specifications

VT8237R Data Sheet
Revision 2.06 December 15, 2004 -146- Device 17 Function 6 Modem Controller Registers
Offset 42 – Function Enable..............................................RO
This register is controlled through function 5 but may be read
from function 6.
7-6 Reserved ........................................ always reads 0
5 Function 5 Config Reg Rx2C Writable..............RO
0 Device 17 Function 5 Rx2C-2F RO.......default
1 Device 17 Function 5 Rx2C-2F RW
4-0 Reserved ........................................ always reads 0
Offset 44 – MC97 Interface Control................................RW
7 AC-Link Interface for Slot-5 (Modem)
0 Disable ...................................................default
1 Enable
6 Secondary Codec Support
0 Disable ...................................................default
1 Enable
5 Function 6 Config Reg Rx9-B Writable
0 Device 17 Function 6 Rx9-B RO...........default
1 Device 17 Function 6 Rx9-B RW
4 Function 6 Config Reg 2C-2Fh Writable
0 Device 17 Function 6 Rx2C-2F RO.......default
1 Device 17 Function 6 Rx2C-2F RW
3 Sync
This bit reports whether there is activity in function 6
(modem). When function 5 (audio) enters low-power
state and wants to gate bit-clock, software needs to
check this bit to see whether bit-clock can actually be
gated, as function 6 shares the same bit-clock.
0 Function 6 activity in progress that requires
bit-clock
1 Function 6 does not need bit-clock so bit-clock
can be gated
2 AC97 Supports Modem Power States D1/D2 ....RO
0 Can’t support D1/D2 power states .........default
1 Can support D1/D2 power states
1-0 Reserved ........................................ always reads 0
Offset D3-D0 – Power Mgmt Capability ......................... RO
31-0 Power Mgmt Capability....always reads 0602 0001h
Offset D7-D4 – Power State ............................................. RW
31-2 Reserved ........................................always reads 0
1-0 Power State
00 D0 .................................................... default
01 D1
10 D2
11 D3