參數(shù)資料
型號： MPC8272CVRTIEX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 1 MM PITCH, PLASTIC, MS-034AAL-1, BGA-516
文件頁數(shù)： 16/60頁
文件大小： 746K
代理商： MPC8272CVRTIEX
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 2
Freescale Semiconductor
23
AC Electrical Characteristics
Figure 10 shows signal behavior in MEMC mode.
Figure 10. MEMC Mode Diagram
NOTE
Generally, all MPC8272 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 13.
Figure 11 is a representation of the information in Table 13.
Figure 11. Internal Tick Spacing for Memory Controller Signals
Table 13. 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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