15-29
MB86R02 ‘Jade-D’ Hardware Manual V1.64
15.7.2 Beat transfer
The DMAC supports beat transfer corresponding to an increment/lap burst of the AMBA standard.
The DMAC has a 64 byte FIFO shared by all channels and enables sequential source access
and destination access. The beat transfer type is set using the DMACA/BT bits.
The correlation to DMACA/BT and AHB of HBURST is shown below.
Table 15-2 DMACA/BT and HBURST
DMACA/BT
Beat transfer type
HBURST
DMACA/MS (mode select)
Block
Burst
Demand
4’b0000
Normal
Single
OK
OK
OK
4’b1000
Single
Single
OK
OK
OK
4’b1001
INCR
INCR
OK
OK
NG
4’b1010
WRAP4
WRAP4
OK
OK
NG
4’b1011
INCR4
INCR4
OK
OK
NG
4’b1100
WRAP8
WRAP8
OK
OK
NG
4’b1101
INCR8
INCR8
OK
OK
NG
4’b1110
WRAP16
WRAP16
OK
OK
NG
4’b1111
INCR16
INCR16
OK
OK
NG
In demand transfer mode, increment/lap burst (INCR* and WRAP*) are unsupported.
15.7.2.1
Normal and Single transfer
The Normal and Single transfer methods are the same. Single source access and single
destination access are executed alternately as shown in Figure 15-2 and Figure 15-3.
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