HD6417712BPV Renesas Electronics America, HD6417712BPV Datasheet - Page 524

• Manufacturer Part Number: HD6417712BPV
• Description: MPU 1.5/3.3V 0K PB-FREE 256-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Ethernetr

Specifications of HD6417712BPV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, FIFO, SCI, SIO
• Peripherals: DMA, POR, WDT
• Number Of I /o: 24
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 13 Direct Memory Access Controller (DMAC)
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.
Rev. 1.00 Dec. 27, 2005 Page 480 of 932
REJ09B0269-0100
(1) When channel 0 transfers
(2) When channel 1 transfers
(3) When channel 2 transfers
(4) When channel 5 transfers
Initial priority order
Priority order
afrer transfer
Initial priority order
Priority order
afrer transfer
Initial priority order
Priority order
afrer transfer
Post-transfer priority order
when there is an
immediate transfer
request to channel 5 only
Initial priority
order
Priority order
afrer transfer
CH0 > CH1 > CH2 > CH3 > CH4 > CH5
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
CH2 > CH3 > CH4 > CH5 > CH0 > CH1
CH1 > CH2 > CH3 > CH4 > CH5 > CH0
CH0 > CH1 > CH2 > CH3 > CH4 > CH5
Figure 13.3 Round-Robin Mode
Channel 0 becomes bottom
priority
Channel 1 becomes bottom
priority.
The priority of channel 0, which
was higher than channel 1, is also
shifted.
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.
Priority order does not change