Measurement-computing DaqBoard-ISA Instrukcja Użytkownika Pobierz pdf (Strona 23)

DaqBoard-ISA User’s Manual

02-14-02

Hardware 3-5

DMA and Interrupt Selection (JP8)

The JP8 11×2 header determines both the interrupt IRQ level and the Direct Memory Access (DMA)

channel for control of background data transfers. The preset default is for DMA channel 5 and for

Interrupt 10 (see figure).

•

Interrupt Selection. The DaqBoard may be set to interrupt the PC when certain hardware conditions

occur. The main board interrupt may be set to IRQ level 10, 11, 12, 14 or 15. The DaqBoard’s IRQ

level cannot be shared with any other device. Setting the JP8 interrupt jumper to OPEN can disable

interrupt assistance and background transfers.

•

DMA Selection. Direct Memory Access allows high-speed data transfer either from the ADC FIFO

or to the DAC FIFO. Only DMA channels 5, 6, and 7 (of an ISA AT machine’s seven channels) are

available for the DaqBoard. Set both the DRQ and DACK jumpers to the desired DMA channel (the

DaqBoard does not share DMA channels). Set the DMA jumpers to OPEN when other devices use

DMA channels 5, 6 and 7.

JP8

DRQ7

DRQ6

DRQ5

IRQ15

IRQ14

IRQ12

IRQ11

IRQ10

DACK7

DACK6

DACK5

Factory Default

DMA Channel 5 and Interrupt 10

JP8

JP8JP8

DRQ7

DRQ6

DRQ5

IRQ15

IRQ14

IRQ12

IRQ11IRQ11

IRQ11

IRQ10

DACK7

DACK6

DACK5

2121

2222

DMA Channel 7 and Interrupt 12

Open DMA

Open Interrupt

JP8 DaqBoard DMA and Interrupt Selection

Connections

Reference Notes:

➣

This section pertains to connections and pinouts for ISA-type DaqBoard applications.

➣

For installation instructions, refer to chapter 2, Setup and Startup.

DaqBoard [ISA type] Multi-Card Cabling

Expansion cards connect to the ISA-type DaqBoards via one externally accessible P1 DB37 I/O connector,

or by two on-board 40-pin headers [for P2 and P3 connections] on the DaqBoard/100A and the

DaqBoard/200A. The DBK option cards can be used without an enclosure, or can be installed in a multi-

card enclosure such as the DBK10, DBK41, or DBK60. The multi-card enclosures can be stacked, making

it possible for a system to accommodate a large number of cards.

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