TI380PCI Datasheet, PDF (28/36 Pages) Texas Instruments – PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS

TI380PCI
PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS
SPWS020 – AUGUST 1995
TI380C2x interface configuration register (TI2000) (continued)
CONNECTOR bit 10: The CONNECTOR bit indicates the connector in use: TI2000 drivers do not currently use
this bit; however, it must always read as 0 if it is not implemented in adapter logic. The value of this bit is
presented on pin DB9 / UTP of the TI380PCI. Upon reset, this bit is 0. This bit echoes bit 10 of the MISCCNTL
register.
1 = D-Shell (AUI or DB9)
0 = UTP / 10BaseT
SPEED bit 9: Indicates whether the driver must initialize 4- or 16-Mbps token-ring operation. See TOPOLOGY
bit 8.
TOPOLOGY bit 8: Indicates whether the driver must initialize token-ring or Ethernet™ operation.
TI2000 drivers interpret the speed and topology bits together to determine whether to initialize the adapter under
4- or 16-Mbps token-ring, or 10-Mbps Ethernet™ operation:
SPEED BIT 9
0
1
0
1
TOPOLOGY BIT 8
0
0
1
1
DESCRIPTION
Reserved
Ethernet
Token Ring, 16 Mbps
Token Ring, 4 Mbps
These two bits echo bits 8 and 9 in the MISCCNTL Register.
INT bits 4 – 7: The four INT bits indicate the interrupt level. At reset these bits are set to 0x0. These bits echo
the LSBs of the Interrupt Line Register.
7
6
5
4
0
0
0
0
0
0
0
1
0
0
1
0
.
.
.
.
1
1
1
1
INTERRUPT LEVEL
0
1
2
...
15
DMA bits 0 – 3: The four DMA bits indicate the DMA channel. At reset, these bits are 0x0. They are used by
TI2000-compatible software, and the channel number has no meaning in terms of PCI bus DMA. However,
TI2000 drivers read this field, and if it is set to 0, they operate in pseudo-DMA mode. Any other value allows
TI2000 drivers to use PCI DMA operation.
3
2
1
0
0
0
0
0
0
0
0
1
0
0
1
0
.
.
.
.
1
1
1
1
DMA CHANNEL
DMA bus master
DMA bus master
DMA bus master
DMA bus master
Pseudo DMA operation
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