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参数资料
| 型号： | MPC8240LZU250X |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 250 MHz, RISC PROCESSOR, PBGA352 |
| 封装： | TBGA-352 |
| 文件页数： | 13/52页 |
| 文件大小： | 542K |
| 代理商： | MPC8240LZU250X |
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20
MPC8240 (rev0.5) Hardware Specifications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Electrical and Thermal Characteristics
1.4.3.3.1 PCI Signal Output Hold Timing
In order to meet minimum output hold specications relative to PCI_SYNC_IN for both 33 MHz and 66
MHz PCI systems, the MPC8240 has a programmable output hold delay for PCI signals. The initial value
of the output hold delay is determined by the values on the MCP and CKE reset conguration signals.
Further output hold delay values are available by programming the PCI_HOLD_DEL value of the PMCR2
conguration register.
Table 11 describes the bit values for the PCI_HOLD_DEL values in PMCR2.
.
Table 11. Power Management Configuration Register 2—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 66 MHz PCI. Pull-down MCP 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 Table 10 are met for a 66 MHz PCI
001
010
011
100 33 MHz PCI. This setting guarantees the minimum output
hold, item 13a, and the maximum output valid, item 12a, times
as specied in Table 10 are met for a 33 MHz PCI system. See
101
110 (Default if reset conguration pins left unconnected)
111
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