參數(shù)資料
型號: μPD705100
廠商: NEC Corp.
英文描述: 32 Bit Microprocessor(32 位微處理器)
中文描述: 32位微處理器(32位微處理器)
文件頁數(shù): 42/81頁
文件大?。?/td> 441K
代理商: ΜPD705100
42
V830
TM
USER'S MANUAL
4.3 CONTROL SIGNAL TIMING
This section explains bus lock timing and bus hold timing.
4.3.1 Bus Lock
The bus can be locked by encoding its status to prevent, its use by a non-V830 bus master. Bus locking
is applied whenever a CAXI instruction is executed. During lock word access with the CAXI instruction, the
status is as follows:
The bus locked status is output to the status lines in sync with the beginning of a read cycle (BCYST
active).
The bus locked status changes in sync with the end of the last write cycle.
The bus lock timing chart (CAXI instruction execution) is given below.
Figure 4-8. Bus Lock Cycle (32-Bit Bus Mode)
Ta
Ts
Ts
Ti
Ti
Ti
Ti
Ta
Ts
Ts
BCLK (input)
CS0-CS3 (output)
BCYST (output)
R/W (output)
READY (input)
Note 2
D0-D31 (I/O)
Note 1
ST0-ST3 (output)
Bus lock cycle
Notes
1.
A2-A31 (output) and BE0-BE3 (output)
2.
If the chip select function is not used, A28-A31 are output to CS0-CS3.
Remarks 1.
A broken line indicates high impedance.
2.
An arrow indicates a sampling timing.
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