SH7713 datasheet(520/904 Pages) RENESAS

520 / 904 page

Section 13 Direct Memory Access Controller (DMAC)

Rev.1.50 Aug. 30, 2006 Page 480 of 860

REJ09B0288-0150

Round-Robin Mode: Each time one word, byte, longword or 16-byte unit is transferred on one

channel, the priority order is rotated. The channel on which the transfer was just finished rotates to

the bottom of the priority order. The round-robin mode operation is shown in figure 13.3. The

priority of the round-robin mode is CH0 > CH1 > CH2 > CH3 > CH4 > CH5 immediately after a

reset. When round-robin mode is specified, the bus mode setting of multiple channels does not

allow a mixture of cycle steal mode and burst mode.

CH1

> CH2 > CH3 > CH4 > CH5 > CH0

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

CH2

> CH3 > CH4 > CH5 > CH0 > CH1

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

CH3

> CH4 > CH5 > CH0 > CH1 > CH2

CH0

> CH1 > CH2 > CH3 > CH4 > CH5

(1) When channel 0 transfers

Initial priority order

Initial priority

order

Priority order

afrer transfer

Priority order does not change

Channel 2 becomes bottom

priority.

The priority of channels 0 and 1,

which were higher than channel 2,

are also shifted. If immediately

after there is a request to transfer

channel 5 only, channel 5 becomes

bottom priority and the priority of

channels 3 and 4, which were

higher than channel 5, are also

shifted.

Channel 1 becomes bottom

priority.

The priority of channel 0, which

was higher than channel 1, is also

shifted.

Channel 0 becomes bottom

priority

Priority order

afrer transfer

Priority order

afrer transfer

Priority order

afrer transfer

Post-transfer priority order

when there is an

immediate transfer

request to channel 5 only

(2) When channel 1 transfers

(3) When channel 2 transfers

(4) When channel 5 transfers

Figure 13.3 Round-Robin Mode

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