SIM::lsr Class Reference

linear shift register
Core function: SIM::lsr.process()
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Inheritance diagram for SIM::lsr:

Public Member Functions
	lsr ()
	~lsr ()
void	set_length (int L)
void	set_symbol_size (int W)
void	set_reset_state (const bvec &binit)
void	set_output (const bvec &yout)
void	set_state (const bvec &state)
bvec	get_state (void)
bvec	get_reset_state ()
bvec	get_output ()
int	get_length (void)
int	get_symbol_size ()
bmat	process (const bvec &ce, const bmat &x)

Detailed Description

linear shift register
Core function: SIM::lsr.process()

linear shift register with clocked interface as used in BERT
Shift register (aka memory) is a bvec with size of L bits
Input is reprsented by bmat[N,W] for N ce[] ticks
For i-th tick one row in x bmat represents one symbol with W bits
x[i,:] = [x0(0), x0(1),...x0(W-1)]
For active tick ce[i] Input symbol is shifted in memory as W - LSB bits (from index 0)
mem(i) = [x[0:W-1] | mem[0:L-W-1]]
output is bvec with W bit shifted out
y[i,:] = m[L-W:L-1]

Constructor & Destructor Documentation

SIM::lsr::lsr ( )

inline

SIM::lsr::~lsr ( )

inline

Member Function Documentation

int SIM::lsr::get_length

(

void

)

get length of shift register

Returns

- [int] lenght

bvec SIM::lsr::get_output

(

void

)

get initial/idle output vector

Returns

- [bvec] initial vector y0

bvec SIM::lsr::get_reset_state

(

)

get reset binary vector

Returns

- [bvec] reset vector

bvec SIM::lsr::get_state

(

void

)

get state of shift register (aka memory)

Returns

- [bvec] state of shift register

int SIM::lsr::get_symbol_size

(

void

)

get size of input/output symbol

Returns

- [int] lenght of symbol

bmat SIM::lsr::process	(	const bvec &	ce,
		const bmat &	x
	)

for active clock ticks ce[i]
right shift in one input symbol x[i,:] and shift out one symbol y[i,:]

Parameters

ce	- [bvec] - clock enable vector - sizeof(ce)=N
x	- [bmat] - input symbols matrix - sizeof(x)=[N,W]

Returns

y - [bmat] - output symbols matrix - sizeof(y)=[N,W]

void SIM::lsr::set_length

(

int

L

)

set lenght of shift register

Note

also sets default reset bvec s0 = zeros(L) and resets register

set_length() and set_symbol_size() are minimal set-up

Parameters

[in]

L

- [int] size of shift register (aka memory)

void SIM::lsr::set_output

(

const bvec &

yout

)

sets initial/idle output vector

Note

yout is a bvec of symbol size (W) length, initialized by set_symbol_size

Parameters

[in]

yout

- [bvec] y0 = yout

void SIM::lsr::set_reset_state

(

const bvec &

binit

)

set reset vector

Note

can be redefined after setting length of shift register

Parameters

[in]

binit

- [bvec] reset vector

void SIM::lsr::set_state

(

const bvec &

state

)

set state of shift (aka memory) register

Parameters

[in]

state

- [bvec] vector to set

void SIM::lsr::set_symbol_size

(

int

W

)

set size of a symbol

Note

W it checked to be smaller or equal with lenght

also sets default initial/idle bvec y0 = zeros(W)

set_length() and set_symbol_size() are necessary minimal set-up

Parameters

[in]

W

- [int] size of a symbol

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The documentation for this class was generated from the following files:

• C:/jobs/vcc/itpp_sci/include/sim/sim_lsr.hpp
• C:/jobs/vcc/itpp_sci/sim_lib/code/sim_lsr.cpp