Circuit for harmonizing read and wright between central processor and input output interface device
A central processing unit, input and output technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of reading or writing data errors, too late to send waiting signals, and impracticality, so as to avoid transmission errors and reduce The effect of system design
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[0039] see Figure 6 Shown, the present invention is to set up a synchronous control unit 3 and a signal input unit 5 (referring to Fig. 7, shown in 8) between CPU (central processing unit) 1 and PCMCIA Card (standard input and output interface device) 2, wherein the The synchronous control unit 3 may include:
[0040] A flip-flop 31, the input terminal is connected to the output terminal of a read-write signal extractor 32, and the reverse output terminal is connected to one input terminal of the first comparison logic gate 33, and the input terminal is controlled by the trigger terminal. When the connected CPU (Central Processing Unit) 1 is input with timing pulse (Clock) 4, the reverse output terminal can provide a reverse sync pulse state.
[0041]A read-write signal picker 32, the input end is respectively connected with the signal control lines of the read end (READ) and the write end (WRITE), and the output end is connected to the input end of a flip-flop 31, when Whe...
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