Tektronix 071-0590-00 user manual Affected Input Allowable Control

Functional Overview

Analyzer INPUT Section

The controls shown below are used to set up the Analyzer clock and data inputs.

INPUT

DELAY
V-TERM V-THRESH
D-INV		EXT
DATA	DATA	REFERENCE DATA	CLOCK	CLOCK
		(1)		(1)(2)
	50 Ohm, 2V MAX		50 Ohm, 1.5V MAX

∙DELAY: Press this key to add delay to the DATA or REF DATA inputs to adjust the clock/data phase relationship. Note that the Auto_Search function will automatically set data delay to a value which provides the maximum noise immunity, that is so that the active (falling) edge of the clock falls in the middle of data bit time slots.

∙V-THRESH:Press this key to set the input decision threshold for the DATA and REF DATA inputs. Note that threshold does not apply when differential operation is selected. Function keys F2 and F3 are OFF when programming DATA. Function key F3 is ON when programming REF DATA.

∙V-TERM:Press this key to select the input terminations for the DATA,

CLOCK, or REF DATA inputs. Available selections are: (GND, -2 V, or AC). See table below.

∙D-INV:Press this key to select either the data non-inverted (LED off) or data inverted (LED on) mode.

∙EXT: This is an input for an external data reference signal.

NOTE: Use the F2 and F3 function keys to determine which input will be affected by the DELAY, V-THRESH, and V-TERM controls as follows:

F2	F3	Affected Input	Allowable Control
off	off	DATA	V-TERM, V-THRESH, DELAY
on	off	CLOCK	V-TERM only
off	on	REF DATA	V-TERM, V-THRESH, DELAY
on	on	not allowed

GB1400 User Manual 2-23