am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 44

• Manufacturer Part Number: am79c961
• Description: Pcnettm-isa Jumperless Single-chip Ethernet Controller For Isa
• Manufacturer: Advanced Micro Devices

The following chart and its bit descriptions show the in-
ternal command registers associated with the Plug and
Plug & Play Register Locations Detailed
Description (Refer to the Plug & Play
Register Map above.)
IOAM[3:0]
1-518
Plug and
Play Register
0x60
0x61
0x70
0x71
0x74
0x40
0x41
0x42
0x43
0x44
0x48
0x49
0x4A
0x4B
0x4c
0xF0
IOAM[3:0]
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
AMD
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
BPAM2
SRAM2
IOAM2
BPSZ2
SRSZ2
Bit 7
0
0
0
0
0
0
1
0
0
1
0
Base Address (Hex)
200
220
240
260
280
2A0
2C0
2E0
300
320
340
360
380
3A0
3C0
3E0
I/O Address Address Match to
bits [8:5] of SA bus (PnP
0x60–0x61). Controls the base
address of PCnet-ISA
IOAM will be written with a value
from the EEPROM.
SRAM1
BPAM1
BPSZ1
SRSZ1
IOAM1
Bit 6
0
0
0
0
0
0
1
0
0
1
0
BPAM0
SRAM0
IOAM0
BPSZ0
SRSZ0
Bit 5
0
0
0
0
0
0
1
0
0
1
0
P R E L I M I N A R Y
+
. The
Am79C961
FL_SEL
Bit 4
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
Play operation. These registers control the PCnet-ISA
controller Plug and Play operation.
IRQ[3:0]
IRQ_TYPE
IRQ_LVL
IRQ[3:0]
0
0
0
1
1
1
1
1
0
1
1
0
0
0
1
1
BP_CS
IRQ3
Bit 3
1
0
0
0
1
1
0
1
0
0
0
0
1
0
0
1
0
1
0
0
1
0
1
0
1
1
0
1
0
1
APROM_EN
ISA IRQ Pin
IRQ3 (Default)
IRQ4
IRQ5
IRQ9
IRQ10
IRQ11
IRQ12
IRQ15
DMA2
IRQ2
Bit 2
IRQ selection on the ISA bus
(PnP 0x70). Controls which inter-
rupt will be asserted. ISA Edge
sensitive or EISA level mode is
controlled by IRQ_TYPE bit in
PnP 0x71. Default is ISA Edge
Sensitive. The IRQ signals will
not be driven unless PnP activate
register bit is set.
IRQ Type (PnP 0x71). Indicates
the type of interrupt setting; Level
is 1, Edge is 0.
IRQ Level (PnP 0x71). A read-
only register bit that indicates the
type of setting, active high or low.
Always
IRQ_TYPE.
0
0
0
1
0
0
1
0
1
0
0
1
0
IRQ_LVL
AEN_CS
BP_16B
SR16B
DMA1
IRQ1
Bit 1
complement
1
0
0
0
1
0
0
0
1
0
IRQ_TYPE
IO_MODE
BPAM3
SRAM3
IOAM3
BPSZ3
SRSZ3
DMA0
IRQ0
Bit 0
0
0
0
0
0
0
0
of
+