PCI-SIO4 User Manual
General Standards Corporation
8302A Whitesburg Drive Huntsville, AL 35802, Phone: (256) 880-8787
50
3.4.6
DMA
CHANNEL
0
C
OMMAND
/S
TATUS
R
EGISTER
:
(PCI
0
X
A8)
D0
Channel 0 Enable
D1
Channel 0 Control
D2
Channel 0 Abort
D3
Clear Interrupt
D4
Channel 0 Done
D7:5
Reserved
3.4.7
DMA
A
RBITRATION
R
EGISTER
:
(PCI
0
X
AC)
Same as Mode /Arbitration Register (MARBR) (PCI 0x08 – See Section 2.2.2)
3.4.8
DMA
T
HRESHOLD
R
EGISTER
:
(PCI
0
X
B0)
D3:0
DMA Channel 0 PCI to Local Almost Full (C0PLAF)
D7:4
DMA Channel 0 Local to PCI Almost Empty (C0LPAE)
D11:8
DMA Channel 0 Local to PCI Almost Full (C0LPAF)
D15:12
DMA Channel 0 PCI to Local Almost Empty (C0PLAE)
D19:16
DMA Channel 1 PCI to Local Almost Full (C1PLAF) (Unused)
D23:20
DMA Channel 1 Local to PCI Almost Empty (C1LPAE) (Unused)
D27:24
DMA Channel 1 PCI to Local Almost Full (C1LPAF) (Unused)
D31:28
DMA Channel 1 PCI to Local Almost Empty (C1PLAE) (Unused)
3.5
MESSAGING QUEUE REGISTERS
Messaging queue registers are not used on the PCI/PMC-HPDI32.