~ National ~ Semiconductor - Al Kossow's Bitsavers

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Interrupt 5
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TL/F/917Q-25
Note: Rev 0 demo software will not work unless the factory configuration for
Jumper Block J4 is used.
FACTORY CONFIGURATION:
DMA
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TL/F/9179-26
The evaluation board may use 1 DMA channel on the PC
expansion bus. DMA channel 1 or 3 can be selected. The
corresponding DACK line must also be installed on Jumper
J4.
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DMA Channel 1
(Factory Instelled)
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TLlF/9179-15
DMA Channel 3
TL/F/9179-16
If a DMA channel is not available an interrupt driven routine
can be used to move data between the PC and the buffer
memory on the evaluation board. Interrupt 5 is used for this
function.
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SELECTING ETHERNET OR CHEAPERNET
IRQ 5 for DMA
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TL/F 19179-17
Two 10 Mbitlsec Interface options are available, a connection
to an external transceiver via the DB-15 connector, or a
direct interface to a BNC T -connector. Seven jumpers are
used to select the appropriate option. These jumpers are
labeled J1C-J7C and J7E.
For Cheapernet the following jumpers should be shorted:
J7C
JIC
J2C
J3C
J4C
J5C
J6C
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J7E •
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TL/F/9179-18
(Factory Installed)
For Ethernet the following jumpers should be shorted.
J7C
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TL/F 19179-19
Double check the jumper positions prior to powering up the
board.
OSCILLATOR
When the SterLAN daughter board is used, the 20 MHz oscillator
must be disconnected by removing jumper JB. The
SterLAN daughter board provides the clock to the NIC.
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Ethernet, Cheapernet
(Factory Installed)
StarLAN
(Removed)
APPENDICES
JB
TLlF/9179-21
The remainder of this document contains the evaluation
board parts list, schematic and PAL descriptions.
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