参数资料
型号: MCF5480CVR166
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 166.66 MHz, RISC PROCESSOR, PBGA388
封装: 27 X 27 MM, 1 MM PITCH, MS-034AAL-1, PBGA-388
文件页数: 3/34页
文件大小: 602K
代理商: MCF5480CVR166
PLL Timing Specifications
MCF548x ColdFire Microprocessor, Rev. 4
Freescale Semiconductor
11
6
PLL Timing Specifications
The specifications in Table 7 are for the CLKIN pin.
Figure 8. Input Clock Timing Diagram
Table 8 shows the supported PLL encodings.
Figure 9 correlates CLKIN, internal bus, and core clock frequencies for the 1x–4x multipliers.
Figure 9. CLKIN, Internal Bus, and Core Clock Ratios
Table 7. Clock Timing Specifications
Num
Characteristic
Min
Max
Units
C1
Cycle time
20
40
ns
C2
Rise time (20% of Vdd to 80% of vdd)
2
ns
C3
Fall time (80% of Vdd to 20% of Vdd)
2
ns
C4
Duty cycle (at 50% of Vdd)
40
60
%
Table 8. MCF548x Divide Ratio Encodings
AD[12:8]1
1 All other values of AD[12:8] are reserved.
Clock
Ratio
CLKIN—PCI and FlexBus
Frequency Range (MHz)
Internal XLB, SDRAM Bus,
and PSTCLK Frequency
Range (MHz)
Core Frequency Range
(MHz)
00011
1:2
41.67–50.0
83.33–100
166.66–200
00101
1:2
25.0–41.67
50.0–83.332
2 DDR memories typically have a minimum speed of 83 MHz. Some vendors specifiy down to 75 MHz. Check with the
memory component specifications to verify.
100.0–166.66
01111
1:4
25.0
100
200
CLKIN
C4
C1
C4
C2
C3
25 40 50 60 70
70 80 90 100110120130140150160170180190200
60
25.0
50.0
100.0
CLKIN (MHz)
Core Clock (MHz)
Core Clock
CLKIN
200.0
40 50 60 70 80 90 100
30
50.0
100.0
Internal Clock
Internal Clock (MHz)
2x
25.0
200.0
2x
4x
100.0
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