Dma Controller - Epson ExpressStation Product Information Manual

System Current usage
2.0 A (n-tax)
3.5' 1.44 Meg
TEAC Fbppy
0.7 A (max)
Hard drsk drive
0.75 A (max)
2 EISA Eqansim 6 A (mex)
Slots
SCSI corltrd m@sters
DMA cmtmfter 2 extended mgisters
0462
DMA dontrotter 2
DMA bwer page register
0070 CLASIC RtOS cormtar
Reel-time ckxk
0070
NMI enable register (write mty)
00
0061 NMI status moister
60, Oow ( KqbwYmousaamtmtter
CLASIC index ragistars (r&&able to Oc26-Oc27)
ExpressStation Computer
System I/O address map

DMA Controller

Direct memory access (DMA) improves system performance by
allowing devices to access the system memory directly. This
ability is provided by two 82C37-compatible direct memory
access controllers (DMACs) contained in the 82357. The seven
independent 32-bit DMA channels are listed in the table below
2.1 A Peak along
0.00 A (max)
assignments.
2 A (max)
DMA request led
DRQ 0 (CTRL1)
DRQ 1 (CTRL1)
DRQ 2 (CTRL1)
DRQ 3 (CTRL1)
DRQ 4 (CTRL2)
NCR 53C7OiI
DRQ 6 (CTRK)
DRQ 7 (CTRL2)
System interrupts
CLASIC
62357
I
02357
0
02357
1
2
62357
3
4
162367
6
62357
7
WD 16C552
6
10
1 1
WD 16C552
12
I Exp.d
WD XC552
IDE drnm
62357
CLASIC
62357
DS 1267
62357
0742
62357
62357
CLASIC
5/12/92
DRAM amtroller ragsters
DMA omtmller 1
with their associated DMA controller and their device
SDLC
(Cascade for CTRL1)
I
Reserved, Keyboard buffer full
o n - w serl Port 2
o n - w Serial Porl 1
User available
On-W Floppy
On-W Parallel Poll
RTC
User avaitabta
Optional SCSILAN
on-board SCSI.
systems, IRO 2 was avaitabte br use m the XT bus. In PC-AT compatible
systems, IRQ 2 not avarlabta for use on the bus. Some older ISAexpansion
IS
boards have an optron to use IRQ 2. This should not ba selected when such a
ExpressStation
62352
02357
02357
110
116
115
126
130
132
131
ExpressStation-5