176
•
Transfer requests
External request (From
DREQ
pins (channels 0 and 1 only).
DREQ
can be detected either
by edge or by level)
Requests from on-chip supporting modules (serial communication interface (SCI), A/D
converter (A/D), and 16-bit integrated timer pulse unit (ITU))
Auto-request (the transfer request is generated automatically within the DMAC)
•
Selectable bus modes: Cycle-steal mode or burst mode
•
Selectable channel priority levels: Fixed, round-robin, or external-pin round-robin modes
•
CPU can be asked for interrupt when data transfer ends
•
Maximum transfer rate
20 M words/s (320 MB/s)
For 5 V and 20 MHz
Bus mode: Burst mode
Transmission size: Word
9.1.2
Block Diagram
Figure 9.1 shows a block diagram of the DMAC.
Summary of Contents for HD6417032
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Page 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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