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Impulse ACB-104 (3512) User Manual

Page 8

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Card Setup

Sealevel Systems ACB-104 Page

5

DMA Jumper Option Tables

The following tables show the jumper setting examples for each mode of DMA:

No DMA

Option E2

E3

Ch.A No DMA

None

None

Single Channel DMA (Half Duplex Only)

Option E2

E3

DMA Channel 0

00

None

DMA Channel 1

11

None

DMA Channel 2

22

None

DMA Channel 3

33

None

Full Duplex

Option E2

E3

DMA Ch.1 Receive Data

DMA Ch.3 Transmit Data

11 33

DMA Ch.0 Receive Data

DMA Ch.2 Transmit Data

00 22

Note: DMA Channel 2 can only be used if the floppy disk DMA drivers are turned off. Please refer to the Toolkit

disk for software examples.

DMA Enable Header E1

Header E1 selects whether the DMA tri-state drivers are enabled permanently, (position A) disabled permanently
(jumpers removed), or which DMA enable control port bit is used to enable the DMA hardware request and
acknowledge signals. Removing the jumper disables the drivers and no DMA can be performed.

Note: The power on reset signal resets or disables the DMA software enable signal.

S1 S2 A

E1

Figure 5 - DMA Enable Header E1