the port’s hardware automatically generates control signals and detects response

[w410565]

Dear Jan,
     In the EPP mode part of the your book , I read this sentence that is "the port’s hardware automatically generates control signals and detects response".
I had understood "the PC’s EPP hardware automatically toggles the nAStrobe or nDStrobe output"，but how does the port detect response?
Like in data read of the EPP mode,which one detects the response,the hardware or the sofeware?how can I connect it to the software which I wrote  in the PC,If the work did by the hardware?

thank u!

[Jan Axelson]

On detecting that the peripheral has brought nWait high, the EPP hardware on the PC latches the received data and brings nDStrobe high.

Applications that can access hardware ports can read received data at the EPP data port (base address + 4).