초록 ▼

An apparatus and method for enabling a Peripheral Component Interconnect ("PCI") bus to support direct memory access ("DMA") transfers. The apparatus comprises a plurality of DMA controllers, a state machine and an internal storage element. The plurality of DMA controllers transfers DMA requests for

An apparatus and method for enabling a Peripheral Component Interconnect ("PCI") bus to support direct memory access ("DMA") transfers. The apparatus comprises a plurality of DMA controllers, a state machine and an internal storage element. The plurality of DMA controllers transfers DMA requests for an electronic device to the state machine and DMA acknowledges from the state machine to the electronic device. The state machine controls the DMA transfer by performing two transactions for each DMA transfer; namely, a memory cycle and an input/output cycle. The internal storage element acts as a buffer for this multiple cycle DMA transfer.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus configured to support a direct memory access transfer on a multiplexed bus between a main memory element and an electronic device, the apparatus comprising:a plurality of direct memory access controllers capable of receiving a direct memory access request fro

[ What is claimed is:] [1.] An apparatus configured to support a direct memory access transfer on a multiplexed bus between a main memory element and an electronic device, the apparatus comprising:a plurality of direct memory access controllers capable of receiving a direct memory access request from the electronic device coupled to the multiplexed bus;a state machine coupled to the plurality of direct memory access controllers, the state machine coordinating the direct memory access transfer by separating the direct memory access transfer into at least a memory cycle and an input/output cycle upon detecting that at least one of the plurality of direct memory access controllers has received the direct memory access request; andan internal storage element coupled to the state machine, the internal storage element collecting data during the direct memory access transfer.