A control chip having a multiple-layer defer queue therein and a method of operating
the control chip. The control chip is coupled to a CPU bus and a PCI bus. The control
chip comprises of a PC request queue, a multiple-layer defer queue, a PCI access
queue and a PCI controller. The multiple-layer defer queue facilitates the processing
of a multiple of concurrent CPU requests that belong to a first request type. The
multiple-layer defer queue supports retry and defer transactions, thereby reducing
data transmission between the CPU and the control chip.
