CMA8864-04 Datasheet, PDF (4/9 Pages) List of Unclassifed Manufacturers – I2C, Mixed Voltage clock Synthesizer with Buffer for PENTIUMTM & II CPU/PCI system

Ver. 1.2
6F, No. 100, Sec. 4, Civil Boulevard, Taipei, Taiwan
TEL: [phone] FAX: [phone]
WWW : http://www.cmedia.com.tw
Byte 0 : Function and Frequency Select Register (1=enable, 0=disable)
Bit PIN# @Pup Description
7
--
0
Must be 0 for normal operation.
0 -- ¡ Ó 1.5% frequency modulation.
1 -- ¡ Ó 0.5% frequency modulation.
6
--
0 Bit6 Bit5 Bit4
CPU, SDRAM
PCI
5
--
0
111
66.8
4
--
0
110
60
101
75
33.4 (1/2 CPU)
30 (1/2 CPU)
37.5 (1/2 CPU)
100
83.3
011
68.5
010
83.3
001
75
000
50
33.3 (2/5 CPU)
34.5 (1/2 CPU)
41.65 (1/2 CPU)
30 (2/5 CPU)
25 (1/2 CPU)
3
--
0
0 -- Frequency is selected by hardware select, latched inputs.
1 -- Frequency is selected by Bit 6 : 4.
2
--
0
Must be 0 for normal operation.
0 -- Frequency modulation center spread type.
1 -- Frequency modulation down spread type.
1
--
0
0 -- Normal.
1 -- Frequency modulation enabled type.
0
--
0
0 -- Normal.
1 -- Tristate all outputs.
Byte 1 : CPU Active/Inactive Register (1=enable, 0=disable)
Bit
PIN#
7
26
@Pup
1
Description
48MHz (Active/Inactive)
6
25
1
24MHz (Active/Inactive)
5
--
X
Reserved
4
--
X
Reserved
3
40
1
CPUCLK4 (Active/Inactive)
2
41
1
CPUCLK3 (Active/Inactive)
1
43
1
CPUCLK2 (Active/Inactive)
0
44
1
CPUCLK1 (Active/Inactive)
Byte 2 : PCI Active/Inactive Register (1=enable, 0=disable)
Bit
PIN#
@Pup
Description
7
--
X
Reserved
6
7
1
PCICLK_F (Active/Inactive)
5
15
1
PCICLK6 (Active/Inactive)
4
13
1
PCICLK5 (Active/Inactive)
3
12
1
PCICLK4 (Active/Inactive)
2
11
1
PCICLK3 (Active/Inactive)
1
10
1
PCICLK2 (Active/Inactive)
0
8
1
PCICLK1 (Active/Inactive)
CMEI
4
CMA8864-04