IDTCV115FPVG IDT, Integrated Device Technology Inc, IDTCV115FPVG Datasheet - Page 12

• Manufacturer Part Number: IDTCV115FPVG
• Description: IC FLEXPC CLK PROGR P4 56-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: FlexPC™r
• Type: PC Clockr

Specifications of IDTCV115FPVG

• 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: Lead free / RoHS Compliant
• Other names: CV115FPVG

PLL FREQUENCY PROGRAMMING PROCEDURES
The user changes PLL frequency through Soft Alarm or Hard Alarm. The Watch Dog circuit has to be enabled. Based on their application, the user may
enable either one or both of the alarms.
User presets the CPU PLL N and SRC PLL N value:
User selects the frequency for Soft Alarm and Hard Alarm, if enabled respectively:
User sets the Timer and enables the WD circuit for frequency switch:
WD SOFT AND HARD ALARM/TIME OUT OPERATION
WDE
IDTCV115F
PROGRAMMABLE FLEXPC™ CLOCK FOR P4 PROCESSOR
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Trigger Watch Dog Circuit
WD SOFT ALARM TIMER [3:0]
Set CPU PLL N, CN1 and CN2, byte 18 and byte 19
Set SRC(PCI Express) PLL N, PN1 and PN2, byte 21, 22
Select Soft Alarm frequency, byte 23
Select Hard Alarm frequency, byte 24
Set Hard Alarm Timer, byte 25
Set Soft Alarm Timer, byte 26
Enable Soft and Hard Alarm, byte 27
Enable Watch Dog (WDE), byte 27
WDE Disable resets WDSRB and WDHRB.
PCI CLK is selectable from SRC PLL or SATA PLL, byte 5 bit 6. If from SRC PLL, PCI frequency = 1/3 of SRC frequency. If from SATA, PCI
is fixed to 3 selections, 33MHz, 36MHz and 40MHz, byte 5 bit[5:4].
WD HARD ALARM TIMER [7:0]
If Soft Alarm Enabled (byte 27):
Set WDSRB (byte 6)
Load CPU N selection
into CPU PLL
Load SRC N selection
into SRC PLL
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If Hard Alarm Enabled (byte 27):
If Hard Alarm Relatch Enabled:
Set WDHRB (byte 6)
Load CPU N and Band selections into CPU PLL
Load SRC N selections into SRC PLL
Latch FSC, B, A
COMMERCIAL TEMPERATURE RANGE