System for generating status signals of second bus on first bus by comparing actual phase of the second bus with expected phase of second bus

Method for accelerating operation of a first controller which transfers information between a first device and a second device, said first controller communicating with said first device via a first bus, and communicating with said second device via a second bus, said method comprising the steps of:

• executing a transaction for transferring information from said first device to said second device;
• monitoring an actual phase of said second bus;
• comparing said actual phase of said second bus with an expected phase of said second bus;
• and
• generating status signals on said first bus in response to said step of comparing.

Apparatus for accelerating operation of a first controller which communicates with a second controller, comprising:

• an input/output for receiving information from the second controller which designates an operation to be executed by the first controller;
• a processor for executing said operation and for determining an operation status of said first controller for transmission to said second controller upon execution of said operation, said operation status being selected from among a group of status responses which include:
• supplying a first output signal to the second controller, said first output signal being indicative of the first controller having completed execution of said operation;
• and
• supplying said first output signal and a second output signal to the second controller, said second output signal being indicative of an acceptable but undesired condition during execution of said operation.

Method for accelerating operation of a first device which communicates with a second device, comprising the steps of:

• receiving information from the second device which designates an operation to be executed by the first device;
• and
• generating, upon execution of said operation, an operation status of said first device for transmission to said second device, said operation status being selected from among a group of status responses which include:
• supplying a first output signal to the second device, said first output signal being indicative of the first device having completed execution of said operation;
• and
• supplying said first output signal and a second output signal to the second device, said second output signal being indicative of an acceptable but undesired condition during execution of said operation;
• supplying said first output signal and a third output signal to the second device, said third output signal being indicative of an unacceptable error condition during execution of said operation, wherein said operation is a command of a multiple command transaction and upon a supply of said first signal in an absence of said second and third signals, each command of said multiple command transaction is executed without generating an interrupt from said first device to said second device.