ICS9FG108 Datasheet, PDF (6/19 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4 CPU, PCI-Express & SATA Clocks

ICS9FG108
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
SMBus Table: Device Control Register, READ/WRITE ADDRESS (DC/DD)
Byte 0
Pin #
Name
Control Function
Type
Bit 7
27
SEL14M_25M#¹
RW
(FS3)
Bit 6
6
Bit 5
44
Bit 4
45
Bit 3
26
FS2¹
RW
FS1¹
RW
FS0¹
RW
Spread Enable¹
RW
Bit 2
-
Enable Software Control of Frequency, Spread
Enable (Spread Type always Software Control)
RW
Bit 1
-
DIF_STOP# drive mode
RW
Bit 0
-
Spread Type
RW
0
1
PWD
See Frequency
Selection Table, Page 1
Off
Hardware
Select
Driven
Down
On
Software
Select
Hi-Z
Center
Pin 27
Pin 6
Pin 44
Pin 45
Pin 26
0
0
0
Notes:
1. These bits reflect the state of the corresponding pins at power up, but may be written to
if Byte 0, bit 2 is set to '1'. FS3 is the SEL14M_25M# pin.
SMBus Table: Output Enable Register
Byte 1
Pin #
Name
Bit 7
-
DIF_7 EN
Bit 6
-
DIF_6 EN
Bit 5
-
DIF_5 EN
Bit 4
-
DIF_4 EN
Bit 3
-
DIF_3 EN
Bit 2
-
DIF_2 EN
Bit 1
-
DIF_1 EN
Bit 0
-
DIF_0 EN
Control Function
Output Enable
Output Enable
Output Enable
Output Enable
Output Enable
Output Enable
Output Enable
Output Enable
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
Disable
Disable
Disable
Disable
Disable
Disable
Disable
Disable
1
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
PWD
1
1
1
1
1
1
1
1
SMBus Table: Output Stop Mode Register
Byte 2
Pin #
Name
Control Function
Bit 7
-
DIF_7 STOP EN Free Run/ Stop Enable
Bit 6
-
DIF_6 STOP EN Free Run/ Stop Enable
Bit 5
-
DIF_5 STOP EN Free Run/ Stop Enable
Bit 4
-
DIF_4 STOP EN Free Run/ Stop Enable
Bit 3
-
DIF_3 STOP EN Free Run/ Stop Enable
Bit 2
-
DIF_2 STOP EN Free Run/ Stop Enable
Bit 1
-
DIF_1 STOP EN Free Run/ Stop Enable
Bit 0
-
DIF_0 STOP EN Free Run/ Stop Enable
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
Free-run
Free-run
Free-run
Free-run
Free-run
Free-run
Free-run
Free-run
1
Stop-able
Stop-able
Stop-able
Stop-able
Stop-able
Stop-able
Stop-able
Stop-able
PWD
0
0
0
0
0
0
0
0
IDT^TM/ICS^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
6
ICS9FG108 REV G 04/06/07