DMA CONTROLLER
S3C2416X RISC MICROPROCESSOR
8-4
3.1 EXTERNAL DMA DREQ/DACK PROTOCOL
There are four types of external DMA request/acknowledge protocols. Each type defines how the signals like
DMA request and acknowledge are related to these protocols.
3.1.1 Basic DMA Timing
The DMA service means paired Reads and Writes cycles during DMA operation, which is one DMA operation.
The Figure 8-1 shows the basic Timing in the DMA operation of the S3C2416.
•
The setup time and the delay time of XnXDREQ and XnXDACK are same in all the modes.
•
If the completion of XnXDREQ meets its setup time, it is synchronized twice and then XnXDACK is asserted.
•
After assertion of XnXDACK, DMA requests the bus and if it gets the bus it performs its operations. XnXDACK
is deasserted when DMA operation finishes.
XSCLK
9.3ns Setup
9.3ns Setup
6.8ns Delay
6.6ns Delay
Read Write
Min. 2MCLK
XnXDREQ
XnXDACK
Min. 3MCLK
Figure 8-1. Basic DMA Timing Diagram
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...