15-21
MB86R02 ‘Jade-D’ Hardware Manual V1.64
15.7.1.3
Burst transfer
Operation
In burst transfer mode, DMA transfer is executed for a number of blocks, multiplied by the
number of transfers (DMACA/BC
×
DMACA/TC) using 1 request.
When the number of transfers (DMACA/TC) is set to values other than "0", TC is decremented by
1 after completing the DMA transfer. DMA transfer is completed after the last transfer (BC is 4'h0
and TC is 16'h0000).
Transfer gap
After completing DMA transfer, DMAC negates the bus request to the arbiter so that a transfer
gap does not occur in burst transfer mode.
Register setting changes during DMA transfer (e.g. disable/interruption setting) are reflected after
completing DMA transfer.
Transfer request
Software request, external (DREQ), and peripheral (IDREQ) requests are valid in this mode.
•
Software request
Set "1" to DMACA/ST and set 5'b00000 to DMACA/IS
•
External request
Set "0" to DMACA/ST and set 5'b01110 (rising edge of transfer request) or 5'b01111 (falling
edge of transfer request) to DMACA/IS
•
Peripheral request
Set "0" to DMACA/ST and set 5'b1**** (rising edge of transfer request) to DMACA/IS
When external request or peripheral request mode is selected, the DMAC detects the transfer
request edge. When DMA transfer of BC
×
TC is executed by either of these requests, the DMAC
is unable to detect the next transfer; however it is able to detect the next transfer request after
DMA transfer of BC
×
TC has been completed.
Содержание MB86R02
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