CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
196
6.17 One Time Single Transfer with DMARQ0 to DMARQ3
To execute one time single transfer to external memory via DMARQn signal input, DMARQn should be inactive
within the clock time shown in Table 6-4 from when DMAAKn becomes active (n = 0 to 3). If DMARQn is active for
more than the clock time shown in Table 6-4, single transfers are continuously executed.
Time for a single transfer
one time only.
DMARQn
(input)
DMAAKn
(output)
Table 6-4. DMAAKn Active
→
→
→
→
DMARQn Inactive Time for Single Transfer to External Memory
Transfer Type
Source
Destination
DMAAKn Signal Active
→
DMARQn Inactive Time (Max.)
Note
DRAM (off page)
All objects
5 clocks
DRAM (on page)
All objects
4 clocks
SRAM or external I/O
All objects
4 clocks
Internal RAM or internal peripheral
I/O
DRAM (off page)
7 clocks
Internal RAM or internal peripheral
I/O
DRAM (on page)
6 clocks
Internal RAM
SRAM or external I/O
6 clocks
Two-cycle transfer
Internal peripheral I/O
SRAM
6 clocks
DRAM (off page)
↔
External I/O
3 clocks
DRAM (on page)
↔
External I/O
2 clocks
Flyby transfer
SRAM
↔
External I/O
2 clocks
Note When inserting waits, add the number of waits together.
Remark n = 0 to 3
Содержание V850E/MS1 UPD703100
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