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参数资料
| 型号： | MPC972FA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 125 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP52 |
| 封装： | LQFP-52 |
| 文件页数： | 10/12页 |
| 文件大小： | 337K |
| 代理商： | MPC972FA |
MPC972
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
192
SYNC Output Description
In situations where output frequency relationships are not
integer multiples of each other there is a need for a signal for
system synchronization purposes. The SYNC output of the
MPC972 is designed to specifically address this need. The
MPC972 monitors the relationship between the Qa and the Qc
banks of outputs. It provides a low going pulse, one period in
duration, one period prior to the coincident rising edges of the
Qa and Qc outputs. The duration and the placement of the pulse
is dependent on the higher of the Qa and Qc output frequencies.
The timing diagrams in the data sheet show the various
waveforms for the SYNC output. Note that the SYNC output is
defined for all possible combinations of the Qa and Qc outputs
even though under some relationships the lower frequency
clock could be used as a synchronizing signal.
Table 1. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
fsela1
fsela0
Qa
fselb1
fselb0
Qb
fselc1
fselc0
Qc
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/12
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/10
0
1
0
1
0
1
VCO/2
VCO/4
VCO/6
VCO/8
Table 2. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
fselFB2
fselFB1
fselFB0
QFB
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/10
1
0
1
0
1
0
1
VCO/8
VCO/12
VCO/16
VCO/20
2
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For More Information On This Product,
Go to: www.freescale.com
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