User`s guide

Probe Trace Expressions 17
-59
You can use signal constants in signal expressions. Specify them
as shown in Table 17-13
.
You can use bus constants in bus expressions. Specify them as
strings of the form:
r'ddd
For a discussion and demonstration of digital trace presentation,
complete the Mixed Analog/Digital Tutorial on page 17-25
.
Table 17-13
Probe Signal Constants
Si
g
nal Constant Meanin
g
’0 low
’1 high
’F falling
’R rising
’X unknown
’Z high impedance
This
placeholder...
Means this...
r
case-insensitive radix specifier (x, h, d, o, or
b)
ddd
string of digits appropriate to the specified
radix
Example notations for bus
constants:
This notation...
Has this
radix...
x'3FFFF
hexadecimal
h'5a
hexadecimal
d'79
decimal
o'177400
octal