Measurement-computing Digital488 Manual do Utilizador descarregar pdf (Página 23)

Section 2 Getting Started

2.7

2.3.3.2 Data Strobe

(Pin 42)

The

Data Strobe

output is pulse for approximately 50

microseconds after new data is output on the I/O port. The

Data

Strobe

line is normally active high but may be programmed active

low by the

Invert

command (

). The

Handshake

command

(H1)

can pulse the

Data Strobe

line, independent of an I/O operations.

Timing Diagram for Strobe Output

DATA VALID

15 µS min

50 µS typ†

† 15 µS typ in F5 Format

DATA

STROBE

2.3.3.3 External Data Ready

[EDR]

(Pin 46)

The

External Data Ready

[

EDR

] line is an edge sensitive

input which is used to latch input data. It is used in conjunction with

the

Data Ready

command (

). The

EDR

signal must be at least 1

microsecond wide and must have a rise and fall time of less than one

microsecond. The

EDR

line is normally rising-edge sensitive but can

be programmed with the

Invert

command (

I32

) to be falling-edge

sensitive. Refer to the following diagram for timing relationships.

When using the

EDR

line with the

command, data is not

read when the

Digital488

is addressed to talk as with

. The

Digital488

will only output data when the

EDR

line transitions.

EDR

is not functional in the high speed binary (

) format.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 82 83

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