ADSP-BF542/ADSP-BF544/ADSP-BF547/ADSP-BF548/ADSP-BF549
External DMA Request Timing
Table 39 and Figure 29 describe the external DMA request tim-
ing operations.
Table 39. External DMA Request Timing
Parameter
Timing Parameters
tDR
Min
Max
Unit
DMARx Asserted to CLKOUT High Setup
CLKOUT High to DMARx Deasserted Hold Time
DMARx Active Pulse Width
6.0
ns
ns
ns
ns
tDH
0.0
tDMARACT
1.0 × tSCLK
1.75 × tSCLK
tDMARINACT
DMARx Inactive Pulse Width
CLKOUT
tDS
tDH
DMAR0/1
(ACTIVE LOW)
tDMARACT
tDMARINACT
DMAR0/1
(ACTIVE HIGH)
Figure 29. External DMA Request Timing
Rev. C
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Page 58 of 100
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February 2010
ADI [ ADI ]
