A METHOD AND APPARATUS FOR CONTROLLING LINEAR AND TOGGLE MODE BURST ACCESS SEQUENCES USING TOGGLE MODE INCREMENT LOGIC

摘要

Memory access control logic (108) for controlling sequential and toggle mode burst accesses to a memory (109) in a computer system using toggle mode automatic increment logic (201B). The memory access control logic (108) of the invention controls the sequence in which locations of a memory are accessed during a memory burst access operation wherein the burst access sequence is determined by an order in which a burst access starting address is incremented. Toggle increment logic (201B) for incrementing a starting address in a toggle sequence is included in the computer system in which the memory access control logic of the invention is used. An input bus (106) receives a burst access request and a burst access starting address indicating a first memory location to be accessed in response to the burst access request from a device in the computer system. Additional logic (117) determines whether the device requires a linear increment sequence or a toggle increment sequence for the burst access. Control logic (213) controls the toggle increment logic (201B) to increment the starting address in a linear sequence in response to determining that the device requires a linear increment sequence.