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ICS94215 Datasheet(PDF) 5 Page - Integrated Circuit Systems

Part No. ICS94215
Description  Programmable System Clock Chip for AMD - K7™ Processor
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Maker  ICST [Integrated Circuit Systems]
Homepage  http://www.icst.com
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ICS94215 Datasheet(HTML) 5 Page - Integrated Circuit Systems

 
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ICS94215
0442C—07/03/02
1.
The ICS clock generator is a slave/receiver, I
2C component. It can read back the data stored in the latches
for verification. Readback will support standard SMBUS controller protocol. The number of bytes to
readback is defined by writing to byte 8.
2.
When writing to byte 11 - 12, and byte 13 - 14, they must be written as a set.
If for example, only byte
14 is written but not 15, neither byte 14 or 15 will load into the receiver.
3.
The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode)
4.
The input is operating at 3.3V logic levels.
5.
The data byte format is 8 bit bytes.
6.
To simplify the clock generator I
2C interface, the protocol is set to use only Block-Writes from the
controller. The bytes must be accessed in sequential order from lowest to highest byte with the ability to
stop after any complete byte has been transferred. The Command code and Byte count shown above must
be sent, but the data is ignored for those two bytes. The data is loaded until a Stop sequence is issued.
7.
At power-on, all registers are set to a default condition, as shown.
Notes:
Brief I
2C registers description for ICS94215
Programmable System Frequency Generator
Register Name
Byte
Description
PWD Default
Functionality &
Frequency Select
Register
0
Output frequency, hardware / I
2C
frequency select, spread spectrum &
output enable control register.
See individual
byte
description
Output Control
Registers
1-6
Active / inactive output control
registers/latch inputs read back.
See individual
byte
description
Vendor ID & Revision
ID Registers
7
Byte 11 bit[7:4] is ICS vendor id -
1001. Other bits in this register
designate device revision ID of this
part.
See individual
byte
description
Byte Count
Read Back Register
8
Writing to this register will configure
byte count and how many byte will
be read back. Do not write 00H to
this byte.
08H
Watchdog Timer
Count Register
9
Writing to this register will configure
the number of seconds for the
watchdog timer to reset.
10H
Watchdog Control
Registers
10 Bit [6:0]
Watchdog enable, watchdog status
and programmable 'safe' frequency'
can be configured in this register.
000,0000
VCO Control Selection
Bit
10 Bit [7]
This bit select whether the output
frequency is control by
hardware/byte 0 configurations or
byte 11&12 programming.
0
VCO Frequency
Control Registers
11-12
These registers control the dividers
ratio into the phase detector and
thus control the VCO output
frequency.
Depended on
hardware/byte
0 configuration
Spread Spectrum
Control Registers
13-14
These registers control the spread
percentage amount.
Depended on
hardware/byte
0 configuration
Group Skews Control
Registers
15-16
Increment or decrement the group
skew amount as compared to the
initial skew.
See individual
byte
description
Output Rise/Fall Time
Select Registers
17-20
These registers will control the
output rise and fall time.
See individual
byte
description


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