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| 型号： | C9726AY |
| 英文描述： | ST92141 - 8/16 BIT MCU FOR 3-PHASE AC MOTOR CONTROL |
| 中文描述： | CPU系统时钟发生器| SSOP封装| 48PIN |塑料 |
| 文件页数： | 5/16页 |
| 文件大小： | 119K |
| 代理商： | C9726AY |
C9726
Clock Generator for VIA VT8371/Athlon (K7) Chipset Systems
Approved Product
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07047 Rev. **
05/03/2001
Page 5 of 16
Serial Control Registers (Cont.)
Byte 0: Frequency Control Register
(1 = Enable, 0 = Low)
Bit
7
6
5
4
3
2
1
0
@Pup
1
0
0
0
0
0
0
0
Pin#
-
-
-
-
-
-
-
-
Pin Description
Spread Spectrum extension (1= on, 0 = off) see table 4, pg. 10
S2
S1
S0
1 = enable byte 0, bits 6, 5, 4, 2, 1 for frequency selection table 4
S4
S3
See Table 3 below
Byte 1: CPU / SDRAM Clock Register
(1=Enable, 0=Low)
Bit
7
6
5
4
3
2
1
0
@Pup
0
0
0
0
1
0
1
1
Pin#
-
-
-
-
40
-
43,44
46
Pin Description
SBW2 (See SST Page 6, Table 3)
SBW1 (See SST Page 6, Table 3)
SBW0 (See SST Page 6, Table 3)
DASO (See Table 5)
SDRAM12
DAS1 (See Table 5)
CPU,CPU# (0 = disabled, CPU in low and CPU# in Hi-Z mode)
CPUCS
Byte0, Bit 7
0
0
1
1
Byte0, Bit 0
0
1
0
1
Modes
Normal operation
Tri-state
Spread Spectrum On
Test mode (Spread Spectrum On)
Table 4
DAS(1:0)
0
0
1
1
Skew
Default
- 100 ps
- 200 ps
+ 200 ps
Description
0
1
0
1
Applicable to CPUCS
Table 5
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