Desktop Transceiver SFX-TAP4_2/C, V0.1, Technical Description
15
4.9
Input Stage
The input stage consists of a High-Speed comparator. Following operating conditions are
recommended:
VCC
5.0 V
Programmable Threshold
0.0 to 3.0 V
Max. Input Voltage Range
-0.3 V to 5.5 V
5 Software Settings of the Testbus Interface
5.1 TCK Frequency
The effective test speed is defined by software access time and frequency of TCK. The TCK
frequency can be freely programmed in the range of 500 Hz ... 20/50/80 MHz. Thee maximum
TCK frequency is given by the SCANFLEX controller type.
Controller Type
Max. TCK
[MHz]
A
20
B
50
C
80
Die TCK frequency is generated following this formula: x*(12MHz+n*0.25MHz)/2
m
Frequency
Range
Min.
[MHz]
Max.
[MHz]
Resolution
[MHz]
Tolerance Value
for m
Value
for m
Value
for x
1
50
80
0.5
2%
0
112
2
2
12.0
50.0
0.25
2%
0
0...152
1
3
6
12.0
0.125
2%
1
0...47
1
4
0.0005
6
0.25/2
m
2%
2..15
0..47
1
The values of m, n, and x are regarding the set TCK frequency calculated by software SYSTEM
CASCON
/ POLARIS
and limited by the controller type.
The TCK frequency is set as follow:
Move the mouse cursor to
OPTIONS / UUT
. Select the index card
Testbus
. Type-in the wanted
frequency. Red colour indicates a wrong parameter.
Содержание SFX-TAP2/C
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