Interrupts

Question

In case of Vectored interrupts,the I/o device send the vector address along with the I/o request or does it sends after it receives ack/INTA from CPU?

Answer 1

In Daisy Chain

First INTA is sent by CPU to I/O devices which are present in a row, the device which raises the interrupt earlier will take this signal and send Vector Address to the CPU. (Other devices which are present before the device which raises the interrupt will just pass the signal to next device present in the row until it reaches to final one).   

Comments

But what if devices are connected with septate interrupt request and interrupt acknowledgement lines for each device .i belive  then vectors cud be sent wen device raises an interrupt.

Answer 2

yeah ,I/o device will send the vector address along with the I/o request not after INTA