參數(shù)資料
型號(hào)： MPC8248ZQPIEX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, 300 MHz, RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, PLASTIC, MS-034AAL-1, BGA-516
文件頁(yè)數(shù)： 11/60頁(yè)
文件大?。?/td> 918K
代理商： MPC8248ZQPIEX
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 1.5
Freescale Semiconductor
19
AC Electrical Characteristics
Figure 8 shows PIO and timer signals.
Figure 8. PIO and Timer Signal Diagram
6.2
SIU AC Characteristics
Table 11 lists SIU input characteristics.
NOTE: CLKIN Jitter and Duty Cycle
The CLKIN input to the MPC8272 should not exceed +/– 150 psec. This
represents total input jitter—the combination of short term (peak-to-peak)
and long term (cumulative). The duty cycle of CLKIN should not exceed the
ratio of 40:60.
NOTE: Spread Spectrum Clocking
Spread spectrum clocking is allowed with 1% input frequency down-spread
at maximum 60 KHz modulation rate regardless of input frequency.
NOTE: PCI AC Timing
The MPC8272 meets the timing requirements of PCI Specification Revision
2.2. Refer to Section 7, “Clock Configuration Modes” and “Note: Tval
(Output Hold)” to determine if a specific clock configuration is compliant.
Sys clk
PIO/IDMA/TIMER[TGATE assertion] input signals
IDMA output signals
sp22
sp23
sp42/sp43
TIMER(sp42/43)/ PIO(sp42a/sp43a)
sp42a/sp43a
output signals
sp42/sp43
TIMER input signal [TGATE deassertion]
sp22
sp23
Note: TGATE is asserted on the rising edge of the clock; it is deasserted on the falling edge.
(See note)
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