參數(shù)資料
型號: W127
英文描述: Clocks and Buffers
中文描述: 時鐘和緩沖器
文件頁數(shù): 9/20頁
文件大小: 200K
代理商: W127
W127/W127-A
PRELIMINARY
Document #: 38-07225 Rev. *A
Page 9 of 20
Notes:
3.
4.
Configuration
110
is supported by W127-A only (see shaded row of
Table 8
).
CPU, SDRAM, and PCI frequency selections are listed in
Table 1
and
Table 8
.
Table 8. Additional Frequency Selections through Serial Data Interface Data Bytes
[3]
Input Conditions
Data Byte 0, Bit 3 = 1
Bit 6
SEL_2
SEL_1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Output Frequency
CPU Clocks
(MHz)
68.5
112
95.25
100
83.3
75.0
124
66.6
AGP
68.5
74.6
63.5
66.6
55.53
75
82.6
66.6
PCI Clocks
(MHz)
34.25
37.3
31.75
33.3
27.77
37.5
41.3
33.3
Bit 5
Bit 4
SEL_0
0
1
0
1
0
1
0
1
Table 9. Select Function for Data Byte 0, Bits 0:1
Function
Input Conditions
Data Byte 0
Bit 1
0
1
1
Output Conditions
CPU0:3,
SRAM0:11
Note 4
±0.5%
Hi-Z
PCI_F,
PCI0:4
Note 4
±0.5%
Hi-Z
REF
48/24MHZ
48/24 MHz
48/24 MHz
Hi-Z
Bit 0
0
0
1
Normal Operation
Spread Spectrum
Three-state
14.318 MHz
14.318 MHz
Hi-Z
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