14. Direct Memory Access Controller (DMAC)
Rev.1.00 Jan. 10, 2008 Page 667 of 1658
REJ09B0261-0100
14.2
Input/Output Pins
The DMAC-related external pins are shown below.
Table 14.1 shows the configuration of the pins that are connected to external device. The DMAC
has pins for four channels (channels 0 to 3) used in the external bus.
Table 14.1 Pin Configuration for the External Bus
Channel Function
Pin
Name I/O
Description
0
DMA transfer request
DREQ0
*
1
Input
DMA transfer request input from external
device to channel 0
DREQ0
acceptance
confirmation
DRAK0
*
2
Output Notifies acceptance of DMA transfer
request and start of execution from
channel 0 to external device
DMA transfer end
notification
DACK0
*
2
Output Outputs strobe to DMA transfer request
from channel 0 to external device
1
DMA transfer request
DREQ1
*
1
Input
DMA transfer request input from external
device to channel 1
DREQ1
acceptance
confirmation
DRAK1
*
2
Output Notifies acceptance of DMA transfer
request and start of execution from
channel 1 to external device
DMA transfer end
notification
DACK1
*
2
Output Outputs strobe to DMA transfer request
from channel 1 to external device
2
DMA transfer request
DREQ2
*
1
Input
DMA transfer request input from external
device to channel 2
DREQ2
acceptance
confirmation
DRAK2
*
2
Output Notifies acceptance of DMA transfer
request and start of execution from
channel 2 to external device
DMA transfer end
notification
DACK2
*
2
Output Outputs strobe to DMA transfer request
from channel 2 to external device
3
DMA transfer request
DREQ3
*
1
Input
DMA transfer request input from external
device to channel 3
DREQ3
acceptance
confirmation
DRAK3
*
2
Output Notifies acceptance of DMA transfer
request and start of execution from
channel 3 to external device.
DMA transfer end
notification
DACK3
*
2
Output Outputs strobe to DMA transfer request
from channel 3 to external device
Notes: 1. The initial value is low-level detection.
2. The initial value is low-active.
Содержание SH7781
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