What is the meaning of RD'signal in Intel 8151 A?
2011
What is the meaning of RD'signal in Intel 8151 A?
- A.
Read (when it is low)
- B.
Read (when it is high)
- C.
Write (when it is low)
- D.
Read and Write (when it is high)
Attempted by 147 students.
Show answer & explanation
Correct answer: A
In the Intel 8151 A Programmable Peripheral Interface (PPI), the RD signal stands for Read. It is an active-low control signal used to read data from the peripheral device. When this signal goes low, it enables the output buffers of the PPI to place data on the data bus.