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ICS9LPRS480 데이터 시트보기 (PDF) - Integrated Device Technology

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ICS9LPRS480
Programmable System Clock Chip for ATI RS780 - K8™ based Systems
IDT
Integrated Device Technology IDT
ICS9LPRS480 Datasheet PDF : 25 Pages
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Integrated
Circuit
Systems, Inc.
ICS9LPRS480
Table3: 27Mhz_Spread and Frequency Selection Table
SS Enable
B2b1
SS3
Byte 4
bit 7
SS2
Byte 4
bit 6
SS1
Byte 4
bit 5
SS0
Byte 4
bit 4
27MHz_Spread
(MHz)
0
0
0
0
0
27.00
0
0
0
0
1
27.00
0
0
0
1
0
27.00
0
0
0
1
1
27.00
0
0
1
0
0
27.00
0
0
1
0
1
27.00
0
0
1
1
0
27.00
0
0
1
1
1
27.00
0
1
0
0
0
27.00
0
1
0
0
1
27.00
0
1
0
1
0
27.00
0
1
0
1
1
27.00
0
1
1
0
0
27.00
0
1
1
0
1
27.00
0
1
1
1
0
27.00
0
1
1
1
1
27.00
1
0
0
0
0
27.00
1
0
0
0
1
27.00
1
0
0
1
0
27.00
1
0
0
1
1
27.00
1
0
1
0
0
27.00
1
0
1
0
1
27.00
1
0
1
1
0
27.00
1
0
1
1
1
27.00
1
1
0
0
0
27.00
1
1
0
0
1
27.00
1
1
0
1
0
27.00
1
1
0
1
1
27.00
1
1
1
0
0
27.00
1
1
1
0
1
27.00
1
1
1
1
0
27.00
1
1
1
1
1
27.00
Spread
% (when enabled)
No Spread
-0.50
-1.00
-1.50
-2.00
-0.75
-1.25
-1.75
-2.25
+/-0.25
+/-0.5
+/-0.75
+/-1.0
+/-0.25
+/-0.5
+/-0.75
+/-1.0
Down
Down
Down
Down
Down
Down
Down
Down
Center
Center
Center
Center
Center
Center
Center
Center
1391D—02/02/09
10

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