IDT
®
Programmable System Clock Chip for ATI RD790-K8
TM
Based Systems 1393—01/28/14
9LPRS477C
Programmable System Clock Chip for ATI RD790 - K8
TM
based Systems
5
Table1: CPU and HTT Frequency Selection Table
Bit4 Bit3 Bit2 Bit1 Bit0
CPU
FS4
CPU
FS3
CPU
FS2
CPU
FS1
CPU
FS0
SEL_HTT66 = 1 SEL_HTT66 = 0
00000200.00 66.67 100.00 0%
00001205.00 68.33 102.50 2%
00010210.00 70.00 105.00 5%
00011215.00 71.67 107.50 8%
00100220.00 73.33 110.00 10%
00101225.00 75.00 112.50 13%
00110230.00 76.67 115.00 15%
00111235.00 78.33 117.50 18%
01000240.00 80.00 120.00 20%
01001245.00 81.67 122.50 23%
01010250.00 83.33 125.00 25%
01011255.00 85.00 127.50 28%
01100260.00 86.67 130.00 30%
01101265.00 88.33 132.50 33%
01110270.00 90.00 135.00 35%
01111200.00 66.67 100.00 0%
10000280.00 93.33 140.00 40%
10001285.00 95.00 142.50 43%
10010290.00 96.67 145.00 45%
10011295.00 98.33 147.50 48%
10100300.00100.00 150.00 50%
10101305.00101.67 152.50 53%
10110310.00103.33 155.00 55%
10111315.00105.00 157.50 58%
11000320.00106.67 160.00 60%
11001325.00108.33 162.50 63%
11010330.00110.00 165.00 65%
11011335.00111.67 167.50 68%
11100340.00113.33 170.00 70%
11101345.00115.00 172.50 73%
11110350.00116.67 175.00 75%
11111355.00118.33 177.50 78%
Byte 3 HTT
Single-
HTT
Differential
CPU
(MHz)
Depends on SB_SRC PLL. See Table 4.
Spread
%
(B6b6=1
and
B3b5=1)
CPU
OverClock %
