Programming 43
3.2 Local Configuration Registers
The
Local
Configuration
Registers
are
memory
cycle
accessible
at
the
offsets
from
the
value
stored
in
Base
Address
Register
0.
The
registers
at
offsets
$00
to
$FF
are
also
I/O
cycle
accessible
at
the
offsets
from
the
value
stored
in
Base
Address
Register
1.
The
offsets
are
specified
below.
NOTE
To ensure software compatibility with other RFM-5565 boards using the PLX 9656 and to ensure
compatibility with future enhancements, write zero (0) to all unused bits.
Table 3-35 Local Configuration and DMA Control Registers
PCI
(Offset from
Base Address)
Register Name
Writable
$00-$07
Reserved
N/A
$08
MARBR (same as $AC)
Y
$0C
Big/Little Endian Descriptor
Y
$10-$67
Reserved
N/A
$68
INTCSR
Y
$70
Reserved
N/A
$74
PCI H Rev
Y
$78
Reserved
N/A
$80
DMA Channel 0 Mode
Y
$84
DMA Channel 0 PCI Address
Y
$88
DMA Channel 0 Local Address
Y
$8C
DMA Channel 0 Transfer Byte Count
Y
$90
DMA Channel 0 Descriptor Pointer
Y
$94-$A7
Reserved
N/A
$A8
DMA CSR 0
Y
$AC
MARBR (same as $08)
Y
$B0
Reserved
N/A
$B4
DMA Channel 0 PCI DAC Upper Address
Y
$B8-$EF
Reserved
N/A
$F0
PCI PIO Address Range
N
$F4
PCI PIO Base Address (Remap)
Y
$F8-$1FF
Reserved
N/A