ICS9LPRS480 Datasheet, PDF (7/25 Pages) Integrated Device Technology – Programmable System Clock Chip for ATI RS780 - K8TM based Systems

Integrated
Circuit
Systems, Inc.
ICS9LPRS480
General Description
The ICS9LPRS480 is a main clock synthesizer chip that provides all clocks required for ATI RS7xx-based
systems.using AMD processors. An SMBus interface allows full control of the device.
Block Diagram
X1
X2 OSC
14 .3 1 8 M H z
Fixed PLL
100MHz
SS PLL
CPU/HTT, SRC,
ATIG
100MHz DIF/66MHz
200MHz
27MHz SS PLL
27MHz SS PLL
SS SB_SRC
PD#
SEL_27
SEL_SATA
SEL_HTT66
SMBCLK
SMBDAT
CLKREQ(5:0)#
Control
Logic
REF(2:0)
48MHz_(1:0)
SRC6/SATA
100MHz ^SRC(5:0)
100MHz ^ATIG(2:0)
HTT0/66MHz
CPUKG
SRC7T/27MHz_SS
SRC7C/27MHz_NS
SB_SRC(1:0)
Power Groups
VDD
63
4
16
35
40
26
48
55
56
Pin Number
VDDIO
GND
1
7
10,18
11,17
33
34
43
24
25
43
47
52
60
1391D—02/02/09
Description
USB_48 outputs
SRC/27MHz Outputs
SRC Logic Core
SRC differential outputs (IO's)
SB_SRC Core Logic
SB_SRC differential outputs (IO's)
SRC/SATA differential output
ATIG Core Logic
ATIG differential outputs (IO's)
CPUKG Core Logic
CPUKG differential outputs (IO's)
HTTCLK output
REF outputs
7