Fujitsu FR60 Hardware Manual page 549

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Figure 16.6-4 DREQx Edge Request (2-Cycle Transfer)
MCLK
DREQ
A24 - 0
RD
WR
DEOP
CPU
operation
Figure 16.6-5 DREQx Level Request (2-Cycle Transfer)
MCLK
DREQ
A24 - 0
RD
WR
CPU
operation
In these cases, the transfer source/destination for 2-cycle transfer is the external area. Therefore, to stop at
the second DMA transfer, negate after the fall of #RD2 but before the final MCLK rise of #WR2.
#RD1
#WR1
#RD2
DMA
transfer
3 cycles or more
Next request after DEOP output
#RD1
#WR1
#RD2
#WR2
DMA
transfer
Sensing point of 3rd transfer request
#WR2
CPU
CPU
531

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