IDTCV123PV IDT, Integrated Device Technology Inc, IDTCV123PV Datasheet - Page 5

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IDTCV123PV

Manufacturer Part Number
IDTCV123PV
Description
IC FLEXPC CLK PROGR P4 56-SSOP
Manufacturer
IDT, Integrated Device Technology Inc
Series
FlexPC™r
Type
PC Clockr
Datasheet

Specifications of IDTCV123PV

Input
Crystal
Output
Clock
Frequency - Max
400MHz
Voltage - Supply
3.135 V ~ 3.465 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
56-SSOP
Frequency-max
400MHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
CV123PV
CONTROL REGISTERS
N PROGRAMMING PROCEDURE
SSC MAGNITUDE CONTROL, SMC
RESOLUTION
IDTCV123
PROGRAMMABLE FLEXPC™ CLOCK FOR P4 PROCESSOR
Most of the Bytes, from Byte8-Byte31, are used to adjust output waveforms and SSC modulation profiles. The power on setting will be changed according
to each power on frequency selection. To avoid mistakes, don’t write on those byte (be careful about Block Write). It is suggested to use the Index Byte
write to access bytes.
CPU (MHz)
Use Index byte write.
For N programming, the user only needs to access Byte17, Byte 25, and Byte8.
1.
2.
3.
Center spread only works when the N Programming bit is enabled. Down spread is OK even N Programming bit is disabled
It is OK to change N value to any value on the bench test board. In the system, IDT recommends the stepping change. It is unknown how much
the system can sustain for each stepping change; the estimate is about 5. If the N changes too much in one step, the system will likely hang.
Note that SATA is with SRC PLL. This SATA Hard Drive might not operate during SRC N programming.
100
133
166
200
266
333
400
SMC[2:0]
000
001
010
011
100
101
110
111
Write Byte17 for CPU PLL N, CPU f = N* Resolution, see resolution table below Byte17.
Write Byte25 for SRC PLL N, SRC f = N*0.666667, PCI = SRC f /3, SATA f = SRC f.
Enable N Programming bit, Byte8 bit1. Once this bit is enabled, any N value will be changed on the fly.
Resolution
0.666667
0.666667
1.333333
1.333333
1.333333
2.666667
2.666667
±0.125
±0.375
±0.25
-0.25
-0.75
±0.5
-0.5
-1
N =
150
200
125
150
200
125
150
5
FREQUENCY SELECTION TABLE
FS_C, B, A
101
001
011
010
000
100
110
111
COMMERCIAL TEMPERATURE RANGE
RESERVE
CPU
100
133
166
200
266
333
400

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