ICS950812CGLFT IDT, Integrated Device Technology Inc, ICS950812CGLFT Datasheet - Page 22

• Manufacturer Part Number: ICS950812CGLFT
• Description: IC FREQ GEN 200MHZ CLK 56-TSSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Frequency Generatorr

Specifications of ICS950812CGLFT

• Input: Crystal
• Output: Clock
• Frequency - Max: 200MHz
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 56-TSSOP
• Frequency-max: 200MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 950812CGLFT

Spread Spectrum Enable Procedure
Step 1: Power-up ---- Latched inputs, FS(5:0), set frequency per Hardware default on board. SS is off.
BIOS program set IIC Byte0, bit7 to 1, SS will be enable Spread. Note that Byte 10,
Step 2: After power up, SS% can be changed to the fixed selections shown in Frequency Table 2. This
Step 3: To set up Linear programming and SS% adjust using Byte 11 through 14, the BIOS must
IDT
Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread
percentage may cause system failure.
Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread
percentage may cause system failure.
Note: See table 8 for Byte 11-14 default information
BYTE
BYTE
ICS950812
Frequency Generator with 200MHz Differential CPU Clocks
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TM
13
14
Frequency Generator with 200MHz Differential CPU Clocks
Pin #
Pin #
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
bit 7 is default to 0. This allows all setup to be controlled by the Frequency Select
Tables, 1 and 2.
is achieved by Writing to Byte 4, bit 6/7 (FS5:4) and/or Byte 0 (FS3), The data written
to these bytes will overwrite the existing contents and switch to the desired selection.
Byte 10, bit 7 to a 1. This will enable access to Byte 11 and 12, M/N linear programming
and Byte 13 and 14, Spread Spectrum % adjust.
Affected Pin
Affected Pin
Name
Name
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Spread Spectrum Bit13
Spread Spectrum Bit12
Spread Spectrum Bit11
Spread Spectrum Bit10
Spread Spectrum Bit7
Spread Spectrum Bit6
Spread Spectrum Bit5
Spread Spectrum Bit4
Spread Spectrum Bit3
Spread Spectrum Bit2
Spread Spectrum Bit1
Spread Spectrum Bit0
Spread Spectrum Bit9
Spread Spectrum Bit8
Control Function
Control Function
(Reserved)
(Reserved)
22
Type
Type
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
0
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Bit Control
Bit Control
1
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PWD
PWD
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
set
0542J—01/25/10