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參數(shù)資料
| 型號： | MPC180LMB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROPROCESSOR, PQFP100 |
| 封裝： | LQFP-100 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大小： | 356K |
| 代理商： | MPC180LMB |
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MOTOROLA
MPC180 Hardware Reference Manual
13
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Electrical and Thermal Characteristics
indicates whether the transaction is a read or a write and the address bus is decoded to select the destination
within the MPC180. The LUMPWAIT signal drives high after the MPC180 is selected to signal to the
MPC8260 the number of wait states that the device needs to perform a given read or write. When the
LUMPWAIT signal is deasserted, the processor completes the transaction. The MPC8260 then drives the
PSDVAL signal low to indicate that valid data is on the bus. If PSDVAL is driven low during a read cycle,
the MPC180 is driving valid data; if PSDVAL is driven low during a write cycle, the MPC180 has captured
valid data
Figure 6 shows a typical read cycle when the MPC180 is interfacing to an MPC8260 and Figure 7 shows a
typical write cycle.
Figure 6. MPC8260 Interface: Read Cycle
KHPX
PVKH
KHTAX
KHTAV
KHQX
KHAX
AVKH
KHBX
BVKH
KHWX
WVKH
KHCX
CVKH
KHKH
CLK
CS
R/W
BURST
A[18:29]
D[0:31]
LUPMWAIT
PSDVAL
KHQV
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