參數(shù)資料
型號: MCF54454VR266
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 266 MHz, RISC PROCESSOR, PBGA360
封裝: 23 X 23 MM, ROHS COMPLIANT, TEPBGA-360
文件頁數(shù): 21/48頁
文件大?。?/td> 945K
代理商: MCF54454VR266
MCF5445x ColdFire Microprocessor Data Sheet, Rev. 6
Electrical Characteristics
Freescale Semiconductor
28
Figure 13. PCI Timing
5.9.1
Overshoot and Undershoot
Figure 14 shows the specification limits for overshoot and undershoot for PCI I/O. To guarantee long term reliability, the
specification limits shown must be followed. Good transmission line design practices should be observed to guarantee the
specification limits.
P6
PCI_REQ[3:0]/PCI_GNT[3:0] — output valid
12.0
6.0
ns
P7
All PCI signals — output hold
2.0
1.0
ns
1 The PCI bus operates at the CLKIN frequency. All timings are relative to the input clock, CLKIN.
2 All PCI signals are bused signals except for PCI_GNT[3:0] and PCI_REQ[3:0]. These signals are defined as point-to-point
signals by the PCI Specification.
3 The 66-MHz parameters are only guaranteed when the 66-MHz PCI pad slew rates are selected. Likewise, the 33-MHz
parameters are only guaranteed when the 33-MHz PCI pad slew rates are selected.
Table 14. PCI Timing Specifications1,2 (continued)
Num
Characteristic
33 MHz3
66 MHz3
Min
Max
Min
Max
Unit
CLKIN
Input
Setup/Hold
P1
P7
P4
Output Valid
Input Valid
Output
Valid/Hold
P5
P6
P2
P3
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