ICS9FG108D Datasheet, PDF (9/18 Pages) Integrated Device Technology – Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
SMBus Table: Device Control Register, READ/WRITE ADDRESS (DC/DD)
Byte 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Pin #
27
5
44
7
26
Name
Control Function
FS3¹
FS2¹
FS1¹
FS0¹
Spread Enable¹
Type
RW
RW
RW
RW
RW
0
1
See Frequency
Selection Table,
Page 1
Off
On
Default
Pin 27
Pin 5
Pin 44
Pin 7
Pin 26
Bit 2
-
Enable Software Control of Frequency,
Spread Enable (Spread Type always
Software Control)
RW ^{Hardware Software} 0
Select Select
Bit 1
-
Bit 0
-
DIF_STOP# drive mode
Spread Type
RW Driven Hi-Z
0
RW
Down Center 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
Control Function
Type
0
Bit 7
-
DIF_7 EN
Output Enable
RW Disable
Bit 6
-
DIF_6 EN
Output Enable
RW Disable
Bit 5
-
DIF_5 EN
Output Enable
RW Disable
Bit 4
-
DIF_4 EN
Output Enable
RW Disable
Bit 3
-
DIF_3 EN
Output Enable
RW Disable
Bit 2
-
DIF_2 EN
Output Enable
RW Disable
Bit 1
-
DIF_1 EN
Output Enable
RW Disable
Bit 0
-
DIF_0 EN
Output Enable
RW Disable
Note: Byte 1 sets outputs active or inactive, not the conditons set by the OE inputs.
1
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Default
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
1 Default
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
Free-run Stop-able 0
IDT^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
9
1542E 12/16/10