ICS952003 Datasheet, PDF (7/18 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4™ processor

Integrated
Circuit
Systems, Inc.
ICS952003
Preliminary Product Review
Byte 9: Watchdog Timer Count Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
WD7
WD6
WD5
WD4
WD3
WD2
WD1
WD0
PWD
Description
0
0
0
The decimal representation of these 8 bits
correspond to X • 290ms the watchdog
1 _{timer will wait before it goes to alarm mode}
0 ^{and reset the frequency to the safe setting.}
0
0
Default at power up is 16 • 290ms = 4.6
seconds.
0
Byte 10: Programming Enable bit 8 Watchdog Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
Program
Enable
WD Enable
WD Alarm
SF4
SF3
SF2
SF1
SF0
PWD
Description
Programming Enable bit
0
0 = no programming. Frequencies are selected by
HW latches or Byte0
1 = enable all I²C programing.
0 Watchdog Enable bit
0 Watchdog Alarm Status 0 = normal 1= alarm status
0
0 Watchdog safe frequency bits. Writing to these bits
0 will configure the safe frequency corrsponding to
0 Byte 0 Bit 2, 7:4 table
1
Byte 11: VCO Frequency M Divider (Reference divider) Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
Ndiv 8
Mdiv 6
Mdiv 5
Mdiv 4
Mdiv 3
Mdiv 2
Mdiv 1
Mdiv 0
PWD
Description
X N divider bit 8
X
X
X ^{The decimal respresentation of Mdiv (6:0)}
X
corresposd to the reference divider value.
Default at power up is equal to the latched
X _{inputs selection.}
X
X
Byte 12: VCO Frequency N Divider (VCO divider) Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
Ndiv 7
Ndiv 6
Ndiv 5
Ndiv 4
Ndiv 3
Ndiv 2
Ndiv 1
Ndiv 0
PWD
Description
X
X
X
The decimal representation of Ndiv (8:0)
correspond to the VCO divider value.
X _{Default at power up is equal to the latched}
X ^{inputs selecton. Notice Ndiv 8 is located in}
X ^{Byte 11.}
X
X
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