参数资料
型号: MPC8240LZU200X
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 200 MHz, RISC PROCESSOR, PBGA352
封装: 35 X 35 MM, 1.65 MM HEIGHT, 1.27 MM PITCH, TBGA-352
文件页数: 9/58页
文件大小: 596K
代理商: MPC8240LZU200X
MPC8240 Integrated Processor Hardware Specications
17
Electrical and Thermal Characteristics
Table 10. describes the bit values for the PCI_HOLD_DEL values in PMCR2.
.
Table 10. Power Management Configuration Register 2 at 0x72
Bit
Name
Reset
Value
Description
6–4
PCI_HOLD_DEL
xx0
PCI output hold delay values relative to PCI_SYNC_IN. The initial
values of bits 6 and 5 are determined by the reset conguration pins
MCP and CKE, respectively. As these two pins have internal pull-up
resistors, the default value after reset is 0b110.
While the minimum hold times are guaranteed at shown values,
changes in the actual hold time can be made by incrementing or
decrementing the value in these bit elds of this register via software or
hardware conguration. The increment is in approximately 400
picosecond steps. Lowering the value in the three bit eld decreases
the amount of output hold available.
000
001
010
011
100 66 MHz PCI. Pull-down CKE conguration pin with a 2K
or less
value resistor. This setting guarantees the minimum output hold,
item 13a, and the maximum output valid, item 12a, times as
specied in Figure 9 are met for a 66 MHz PCI system. See
101
110 33 MHz PCI. This setting guarantees the minimum output hold,
item 13a, and the maximum output valid, item 12a, times as
specied in Figure 9 are met for a 33 MHz PCI system. See
Figure 10. (Default if reset conguration pins left unconnected.)
111
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