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SDMA Environment
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11.2 SDMA Environment
11.2.1 External SDMA Request Signals
The SDMA controller supports external DMA requests through the sys_ndmareq[3:0] pins. A logical
channel can be configured to respond to an external synchronization request.
describes the external SDMA request signals.
Table 11-1. External SDMA Request Signals
Pin Name
I/O
(1)
Description
Reset
sys_ndmareq0
I
External DMA request signal (active low)
1
sys_ndmareq1
I
External DMA request signal (active low)
1
sys_ndmareq2
I
External DMA request signal (active low)
1
sys_ndmareq3
I
External DMA request signal (active low)
1
(1)
I = Input, O = Output
NOTE:
External SDMA requests can be configured to be either edge or transition (level) sensitive
by the system control module. For more information, see
, SDMA Request
Scheme.
11.2.2 External SDMA Requests Typical Application
shows the SDMA environment with an example of how to use the external hardware DMA
request pins.
2338
SDMA
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated