Agilent Technologies L4400 manual L4450A 64-Bit Digital I/O with Memory and Counter, Bank

L4450A 64-Bit Digital I/O with Memory and Counter 8

L4450A 64-Bit Digital I/O with Memory and Counter

The L4450A has 64- bits of general- purpose digital I/O grouped in 8- bit channels with programmable polarity, input thresholds, and output levels. The module is segmented into two banks of four 8- bit channels. Each bank has 64 Kb of volatile memory for pattern capture and pattern generation with hardware interrupt capability. Up to three pins of handshaking are available for each bank of 32 bits.

The module also has two 10 MHz frequency counter/totalizer measurement input channels and a programmable clock output for frequency synchronization or general clocking needs.

The digital channels are numbered by bank; 101 through 104 and 201 through 204 for banks 1 and 2 respectively. The counter/totalizer channels are assigned channel numbers 301 and 302. The programmable clock is not assigned a channel number.

Bank 1 Bank 2

INTR INTR

8

8

8

8

32 Bits

	Bit 0	8
		Channel
		101
	Bit 7
	Bit 8	8
		Channel
		102
DIO	Bit 15
	Bit 16	8
Bank
		Channel
1		103
	Bit 23
	Bit 24	8

Channel

104

Bit 31

H0

H1

H2

Counter/	IN	24 Bits
		Channel

	Bit 0
	Channel
	201
	Bit 7
	Bit 8
	Channel
	202
DIO	Bit 15
	Bit 16
Bank	Channel
2	203
	Bit 23
	Bit 24
	Channel
	204
	Bit 31
	H0
	H1
	H2

Clock

Totalizer	301
1	Gate

Out

CLK

32 Bits

Counter/	IN	Channel
Totalizer
	Gate	302
2

20 MHz - 10 Hz

L4400 User’s Guide 199