ICS950104 Datasheet, PDF (9/19 Pages) Integrated Circuit Systems – Programmable System Clock Chip for PIII Processor

ICS950104
Advance Information
Byte 13: Spread Sectrum Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
X Spread Spectrum Bit7
X Spread Spectrum Bit6
X Spread Spectrum Bit5
X Spread Spectrum Bit4
X Spread Spectrum Bit3
X Spread Spectrum Bit2
X Spread Spectrum Bit1
X Spread Spectrum Bit0
Note: Please utilize software utility provided by ICS
Application Engineering to configure spread spectrum.
Incorrect spread percentage may cause system failure.
Byte 15: Output Skew Control
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
1
1
(Reserved)
1
1
CPUCLK Skew Control
1
1
(Reserved)
1
1
SDRAM (7:0) Skew Control
Byte 14: Spread Sectrum Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
X Reserved
X Reserved
X Reserved
X Spread Spectrum Bit12
X Spread Spectrum Bit11
X Spread Spectrum Bit10
X Spread Spectrum Bi 9
X Spread Spectrum Bit8
Note: Please utilize software utility provided by ICS
Application Engineering to configure spread spectrum.
Incorrect spread percentage may cause system failure.
Byte 16: Output Skew Control
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0
0
0
PCICLK (5:0, F) Skew Control
0
0
1
0
(Reserved)
0
Byte 17: Output Rise/Fall Time Select Register
Byte 18: Output Rise/Fall Time Select Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
1
0
(Reserved)
1
0
CPUCLK Slew Rate Control
1
0
PCICLK_F Slew Rate Control
1
0
PCICLK (5:0) Slew Rate Control
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
1
0
(Reserved)
1
0
SDRAM (7:0) Slew Control
1
0
(Reserved)
1
0
48MHz Slew Rate Control
Notes:
1. PWD = Power on Default
2. The power on default for byte 13-20 depends on the harware (latch inputs FS(4:0)) or I²C (Byte 0 bit (1:7)) setting. Be sure
to read back and re-write the values of these 8 registers when VCO frequency change is desired for the first pass.
3. If Byte 8 bit 7 is driven to "1" meaning programming is intended, Byte 21-24 will lose their default power up value.
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