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DMA Channels
The system board uses Direct Memory Address (DMA) channels to exchange data without accessing
the CPU. Some channels are assigned for specific use by the system, as defined below. Each DMA
channel appropriates full 32-bit processing. For an ISA bus, channels 0 through 3 are 8-bit and
channels 4 through 7 are 16-bit channels.
DMA
Assignment
0
Spare
1
Spare
2
Floppy I/O Controller
3
Parallel Port
Board Layout
J19
J20
ISA
SCSI J26
Floppy J29
Standard Board Placement
InterServe 8400
AMI RAID Controller (MSMT489)
or Symbios UW SCSI (CINFD80)
100 Base-T Fast Ethernet (CINF920)
InterSite Server Monitor (CINF029)
DMA
4
5
6
7
1
2
PCI
4
3
2
1
J25
PCMCIA
J27, J28
Speaker J30
PCI 0 Connector
Sideband Connector
Slot
PCI 4
PCI 2
ISA 4
Assignment
Cascade input for 0-3
Spare
Spare
Spare
3
4
5
6
7
PCI Bus 0 = 1 - 3
PCI Bus 1 = 4 - 7
PCI Bus 2 = 8 - 12
PCI 1 Connector
8
9
10
11 12
47
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