Chapter 1 - Introduction
interrupt handler outputs an interrupt vector number for the non-DMA engine interrupts or requests access to the LBUS for a DMA engine IACK cycles.
CPU/LBUS Interface
The CPU/LBUS Interface links the CPU core with the LBUS resources. The CPU/LBUS interface converts the CPU Core bus to the LBUS. The Interface is a one-way interface which allows the CPU to act as a LBUS master. The interface does not allow other LBUS masters to access the CPU Core.
The CPU/LBUS interface is composed of address latches, data-latching transceivers, and control logic. The CPU/LBUS Interface performs write-posting and read-latching to maximize the CPU bus and the LBUS performance. The interface also performs relinquish retries, read-modify-write cycles, IACK cycles to the DMA engine, back-to-back write-write cycles and back-to-back, write-read cycles.
