Samsung S3C2451X User Manual page 209

S3C2451X RISC MICROPROCESSOR
9
DMA CONTROLLER
OVERVIEW
S3C2451X supports eight-channel DMA (Bridge DMA or peripheral DMA) controller that is located between the
system bus and the peripheral bus. Each channel of DMA controller can perform data movements between
devices in the system bus and/or peripheral bus with no restrictions. In other words, each channel can handle the
following four cases: 1) both source and destination are in the system bus, 2) source is in the system bus while
destination is in the peripheral bus, 3) source is in the peripheral bus while destination is in the system bus, 4)
both source and destination are in the peripheral bus.
The main advantage of DMA is that it can transfer the data without CPU intervention. The operation of DMA can
be initiated by S/W, or the request from internal peripherals, or the external request pins.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
DMA CONTROLLER
9-1