Agilent Technologies L4400 Manuale Utente Scaricare il pdf (Pagina 2)

2

Digital inputs and outputs for your

most complicated digital applications

The L4450A can be used to simulate or

detect digital patterns. It has eight 8-bit

digital I/O channels with handshaking,

pattern memory, two 10 MHz counters

with gate functions, and a program-

mable clock output.

Digital input/output

The digital I/O bits are organized into

two banks of 32-bits. The I/O bits can

be configured and programmed as

inputs or outputs in 8-bit channels.

The digital outputs can be configured

as active drive or open drain outputs

with a user supplied 10 kΩ pull up. User

supplied pull-up resistors for up to 5 V

outputs are also acceptable. The digital

inputs have programmable thresholds

up to 5 V for compatibility with most

digital logic standards. The on-board

pattern memory can be used to select

and output digital stimulus or bit

stream patterns, or to capture external

digital data. Each bank has independent

memory and directional control so

that one bank can output data while

another captures data. The memory

can be divided up to 64 kbytes per 8-bit

channel.

The digital channels also have:

• Variable active high drive output

from 1.65 V to 5 V or open drain

• Variable input thresholds from 0 V

to 5 V

• Configurable handshaking protocols

including synchronous and strobe

• Programmable polarity

• Source or sink up to 24 mA

• Internal alarming for maskable pat-

tern match

• 1 hardware pattern interrupt per bank

External trigger capabilities make it

easy or you to time and synchronize

measurements and other events. This

can help you determine when to begin

or end an acquisition.

The memory can be allocated as follows:

Default

configuration

Memory on

channels 1 & 2

Memory on

channel 1

Channel 1/5

(bits 7:0)

(bits 39:32)

32 kbytes 64 kbytes 64 kbytes

Channel 2/6

(bits 15:8)

(bits 47:40)

32 kbytes 64 kbytes

Channel 3/7

(bits 23:16)

(bits 55:49)

32 kbytes

Channel 4/8

(bits 31:24)

(bits 63:56)

32 kbyes

1 2 3 4 5 6 7 8 9 10

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