Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Instrukcja Użytkownika Pobierz pdf (Strona 47)

File-based Decoding User Manual Chapter 11: Primitives

LeCroy Corporation 41

NextNBits()

NextNBits (<bit_count integer>)

Parameter Meaning

Default

Value Comments

bit_count in

teger

Support

Supported by all LeCroy analyzers.

Return value

None.

Comments

Reads bit_count bits from the data source specified in the last call to GetNBits,

arting after the last bit that the previous call to GetNBits or NextNBits returned. If

calle

d without a previous call to GetNBits, the result is undefined.

Note that bits are

indexed starting at bit 0.

Example

raw = 'F0F0';# 1111000011110000 binary

result1 = GetNBits ( raw, 2, 4 );

result2 = NextNBits(5);

result3 = NextNBits(2);

This results in:

result1 == C

result2 == 7

result3 == 2

A call to GetNBits, starting at bit 2, reads 4 bits (1100), and returns the value 0xC.

A first call to NextNBits, starting at bit 6, reads 5 bits (00111), and returns the value 0x7.

A second call to NextNBits, starting at bit 11 (= 6 + 5), reads 2 bits (10), and returns the

value 0x2.

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Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Instrukcja Użytkownika Strona 47