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PSpice User Guide Analyzing waveforms October 2019 772 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. An arithmetic or logical operation between a bus operand and a signal operand results in a bus value. Prior to the operation, the signal is converted to a bus of width one, then extended if necessary. You can use signal constants in signal expressions. Specify them as shown in Table 17-22. You can use bus constants in bus expressions. Specify them as strings of the form: r'ddd Table 17-22 Signal constants for digital trace expressions Signal Constant Meaning '0 low '1 high 'F falling 'R rising 'X unknown 'Z high impedance Table 17-23 This placeholder... Means this... r case-insensitive radix specifier (x, h, d, o, or b) ddd string of digits appropriate to the specified radix Table 17-24 Example notations for bus constants: This notation... Has this radix... x'3FFFF hexadecimal h'5a hexadecimal