CY28372
Byte 9 (continued)
Bit @Pup
Bit 4
Name
24_48MHz
Description
1
0
24_48MHz Output Control
Bit 3
24_48MHz
24-MHz or 48-MHz Select
0: 24MHz, 1: 48MHz
Bit 2
Bit 1
Bit 0
0
0
0
SS2
SS1
SS0
Spread Spectrum control bit (0 = down spread, 1 = center spread)
SS[2:0]
000
001
010
011
Spread Mode
Down
Down
Down
Down
Spread%
0,
-0.50 (default)
+0.12, -0.62
+0.25, -0.75
+0.50, -1.00
+0.25, -0.25
+0.37, -0.37
+0.50, -0.50
+0.75, -0.75
100
101
110
Center
Center
Center
Center
111
Byte 10
Bit
@Pup
Name
Description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1
1
1
1
1
1
1
1
IOAPIC_1
IOAPIC_0
REF_1
IOAPIC_1 Output Control
IOAPIC_0 Output Control
REF_1 Output Control
REF_0 Output Control
ZCLK_1 Output Control
ZCLK_0 Output Control
AGP_1 Output Control
AGP_0 Output Control
REF_0
ZCLK_1
ZCLK_0
AGP_1
AGP_0
Byte 11
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
@Pup
Name
Description
0
0
0
0
0
0
0
0
Reserved
Vendor Test Mode (always program to 0)
Vendor Test Mode (always program to 0)
Vendor Test Mode (always program to 0)
Reserved
Reserved
3V66 Fract_Align4
3V66 Fract_Align3
3V66 Fract_Align2
3V66 Fract_Align1
3V66 Fract_Align0
3V66 Frequency Fractional Aligner: These bits determine the 3V66 fixed
frequency. This option does not incorporate spread spectrum.
Fract_Align3V66 (MHz)PCI (MHz)
00000 Off Off(default)
0000166.533.2
0001067.533.7
0001168.534.3
0010069.534.8
0010170.635.3
0011071.635.8
0011172.636.3
0100073.636.8
0100174.737.3
0101075.737.8
0101176.738.4
0110077.738.9
0110178.739.4
0111079.839.9
0111180.840.4
1000081.840.9
1000182.841.4
1001083.941.9
1001184.942.4
1010085.943.0
1010186.943.5
1011088.044.0
1011189.044.5
1100090.045.0
1100191.045.5
1101092.046.0
1101193.146.5
1110094.147.0
1110195.147.6
1111096.148.1
1111197.248.6
Rev 1.0,November 20, 2006
Page 7 of 17
SPECTRALINEAR [ SPECTRALINEAR INC ]
