Asynchronous pseudo-double port image memory access conflict processing method
A technology for image storage and access conflicts, applied to instruments, static indicators, cathode ray tube indicators, etc., to avoid catastrophic consequences and improve reliability
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[0031] refer to figure 1 , divide a complete operation cycle of the read / write operation request signal RD / WR signal of the MPU into three operation areas. The operation of area 1 starts from the rising edge of the signal, and goes through an address setup time (Tas=5ns) and a read / write operation cycle. In the first operation area, the read / write operation of a memory is mainly completed, the data in the interface data register is written into the GRAM or the data in the GRAM is read out to the data register. The operation area 2 is the trigger area for internal display operations. When the read / write operation of the MPU is not performed for a long time, the WR / RD signal is always at high level. At this time, the entire operation can be considered to be in the operation area 2. When the MPU continues to perform read / write operations, the operation area 2 is located between the end point of the operation area 1 and the falling edge of the signal. In the second area of op...
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