参数资料
型号: MPC8272VRP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, EPROM, 300 MHz, RISC MICROCONTROLLER, PBGA516
封装: 27 X 27 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-516
文件页数: 18/61页
文件大小: 394K
代理商: MPC8272VRP
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3
Freescale Semiconductor
25
AC Electrical Characteristics
This figure shows signal behavior in MEMC mode.
Figure 10. MEMC Mode Diagram
NOTE
Generally, all SoC bus and system output signals are driven from the rising
edge of the input clock (CLKin). Memory controller signals, however,
trigger on four points within a CLKin cycle. Each cycle is divided by four
internal ticks: T1, T2, T3, and T4. T1 always occurs at the rising edge, and
T3 at the falling edge, of CLKin. However, the spacing of T2 and T4
depends on the PLL clock ratio selected, as shown in Table 14.
This table is a representation of the information in Table 14.
Figure 11. Internal Tick Spacing for Memory Controller Signals
Table 14. Tick Spacing for Memory Controller Signals
PLL Clock Ratio
Tick Spacing (T1 Occurs at the Rising Edge of CLKin)
T2
T3
T4
1:2, 1:3, 1:4, 1:5, 1:6
1/4 CLKin
1/2 CLKin
3/4 CLKin
1:2.5
3/10 CLKin
1/2 CLKin
8/10 CLKin
1:3.5
4/14 CLKin
1/2 CLKin
11/14 CLKin
CLKin
V_CLK
Memory controller signals
sp34/sp30
CLKin
T1
T2
T3
T4
CLKin
T1
T2
T3
T4
for 1:2.5
for 1:3.5
CLKin
T1
T2
T3
T4
for 1:2, 1:3, 1:4, 1:5, 1:6
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