std

Veryl Standard Library

Version 0.0.1
Repository https://github.com/veryl-lang/std
License MIT OR Apache-2.0

Modules

async_fifo::<S> Asynchronous FIFO
async_handshake::<S> Asynchronous handshake
binary_decoder A binary decoder.
binary_encoder A binary encoder.
counter Value counter
countones
delay Delay input by configured cycle
edge_detector Edge detector
fifo
gray_counter Value counter using Gray Encoding
gray_decoder Converts a Gray encoded bit vector to a binary encoded bit-vector
gray_encoder Converts a binary encoded bit vector to a Gray encoded bit-vector
lfsr_galois
onehot
ram

Module Prototypes

synchronizer

Interfaces

Packages

Modules

async_fifo::<S> Asynchronous FIFO
async_handshake::<S> Asynchronous handshake
binary_decoder A binary decoder.
binary_encoder A binary encoder.
counter Value counter
countones
delay Delay input by configured cycle
edge_detector Edge detector
fifo
gray_counter Value counter using Gray Encoding
gray_decoder Converts a Gray encoded bit vector to a binary encoded bit-vector
gray_encoder Converts a binary encoded bit vector to a Gray encoded bit-vector
lfsr_galois
onehot
ram

async_fifo::<S>

Asynchronous FIFO

Asynchronous FIFO based on gray-code pointer. Generic parameter S is a module name of synchrinozer.

Generic Parameters

S synchronizer

Parameters

WIDTH u32 Data width
TYPE type Data type
STAGES u32 Stages of synchronizer
DEPTH u32 Depth of FIFO
THRESHOLD u32 Threshold for almost full signal
USE_OUT_DATA_RESET bit Whether output data is reset
INITIAL_OUT_DATA TYPE Reset value of output data
MERGE_RESET bit Whether both reset are merged
RESET_SYNC_STAGES u32 Stages of reset synchronizer

Clock Domains

'd
's

Ports

is_clk input 's clock src clock
is_rst input 's reset src reset
os_almost_full output 's logic FIFO is almost full
os_full output 's logic FIFO is full
is_push input 's logic push to FIFO
is_data input 's TYPE push data
id_clk input 'd clock dst clock
id_rst input 'd reset dst reset
od_empty output 'd logic FIFO is empty
id_pop input 'd logic pop from FIFO
od_data output 'd TYPE pop data

async_handshake::<S>

Asynchronous handshake

Asynchronous data transmitter based on handshake protocol. Generic parameter S is a module name of synchrinoizer.

Generic Parameters

S synchronizer

Parameters

WIDTH u32 Data width
TYPE type Data type
STAGES u32 Stages of synchrinoizer
INITIALIZE_DATA_OUT bit Whether output data is reset
INITIAL_DATA_OUT bit<$bits(TYPE)> Reset value of output data
MERGE_RESET bit Whether both reset are merged
RESET_SYNC_STAGES u32 Stages of reset synchronizer

Clock Domains

'd
's

Ports

is_clk input 's clock src clock
is_rst input 's reset src reset
is_valid input 's logic src data is valid
os_ready output 's logic src data is acceptable
is_data input 's TYPE src data
id_clk input 'd clock dst clock
id_rst input 'd reset dst reset
od_valid output 'd logic dst data is valid
id_ready input 'd logic dst data is acceptable
od_data output 'd TYPE dst data

binary_decoder

A binary decoder.

Converts a bit vector from a binary encoding to a bit vector with a unary encoding.

Parameters

BIN_WIDTH u32 Width of the input binary vector

Ports

i_en input logic Enable Signal. Dynamic power is minimzed when not enabled.
i_bin input logic Binary encoded input.
o_unary output logic Unary encoded output.

binary_encoder

A binary encoder.

Transforms a unary encoded value into a binary encoding.

Parameters

UNARY_WIDTH u32 Width of the input unary vector

Ports

i_en input logic Enable Signal. Dynamic power is minimzed when not enabled.
i_unary input logic Unary encoded input.
o_bin output logic Binary encoded output.

counter

Value counter

Parameters

WIDTH u32 Counter width
MAX_COUNT bit Max value of counter
MIN_COUNT bit Min value of counter
INITIAL_COUNT bit Initial value of counter
WRAP_AROUND bit Whether counter is wrap around

Ports

i_clk input clock Clock
i_rst input reset Reset
i_clear input logic Clear counter
i_set input logic Set counter to a value
i_set_value input COUNT Value used by i_set
i_up input logic Count up
i_down input logic Count down
o_count output COUNT Count value
o_count_next output COUNT Count value for the next clock cycle
o_wrap_around output logic Indicator for wrap around

countones

Parameters

W u32

Ports

i_data input logic
o_ones output logic

delay

Delay input by configured cycle

Parameters

DELAY u32 Clock cycle of delay
WIDTH u32 Input/output data width
TYPE type Input/output data type

Ports

i_clk input clock Clock
i_rst input reset Reset
i_d input TYPE Input
o_d output TYPE Output

edge_detector

Edge detector

Parameters

WIDTH u32 Data width
INITIAL_VALUE bit Initial value of internal FF

Ports

i_clk input clock Clock
i_rst input reset Reset
i_clear input logic Clear
i_data input logic Data
o_edge output logic Both edges
o_posedge output logic Positive edge
o_negedge output logic Negative edge

fifo

Parameters

WIDTH u32
TYPE type
DEPTH u32
THRESHOLD u32
FLAG_FF_OUT bit
DATA_FF_OUT bit
RESET_RAM bit
RESET_DATA_FF bit
CLEAR_DATA bit
PUSH_ON_CLEAR bit
MATCH_COUNT_WIDTH u32

Ports

i_clk input clock
i_rst input reset
i_clear input logic
o_empty output logic
o_almost_full output logic
o_full output logic
o_word_count output COUNTER
i_push input logic
i_data input TYPE
i_pop input logic
o_data output TYPE

gray_counter

Value counter using Gray Encoding

Parameters

WIDTH u32 Counter width
MAX_COUNT bit Max value of counter (in binary)
MIN_COUNT bit Min value of counter (in binary)
INITIAL_COUNT bit Initial value of counter (in binary)
WRAP_AROUND bit Whether counter is wrap around

Ports

i_clk input clock Clock
i_rst input reset Reset
i_clear input logic Clear counter
i_set input logic Set counter to a value
i_set_value input COUNT Value used by i_set
i_up input logic Count up
i_down input logic Count down
o_count output COUNT Count value
o_count_next output COUNT Count value for the next clock cycle
o_wrap_around output logic Indicator for wrap around

gray_decoder

Converts a Gray encoded bit vector to a binary encoded bit-vector

  • Space Complexity: O(WIDTH log WIDTH)
  • Time Complexity: O(log WIDTH)

Parameters

WIDTH u32 Input and output bit vector width

Ports

i_gray input logic Input Gray encoded Bit Vector
o_bin output logic Output binary encoded Bit Vector such that o_bin[k] = ^o_bin[WIDTH-1:k]

gray_encoder

Converts a binary encoded bit vector to a Gray encoded bit-vector

  • Space Complexity: O(WIDTH)
  • Time Complexity: O(1)

Parameters

WIDTH u32 Input and output bit vector width

Ports

i_bin input logic Input Binary encoded Bit Vector
o_gray output logic Output Gray encoded Bit Vector

lfsr_galois

Parameters

SIZE u32 Size of the LFSR in bits
TAPVEC TAPVEC_T Bit-vector representing the taps of the LFSR. Default values provided for `SIZE` in range [2, 64]

Ports

i_clk input clock Clock
i_en input logic Enable - LFSR shifts only when enabled. Active high.
i_set input logic Flag to set value of LFSR. Active High.
i_setval input logic Value which LFSR is set to when `i_set` is set.
o_val output logic LFSR value.

onehot

Parameters

W u32

Ports

i_data input logic
o_onehot output logic 1'b1 iff i_data contains exactly one set bit
o_zero output logic 1'b1 iff i_data is zero

ram

Parameters

WORD_SIZE u32
ADDRESS_WIDTH u32
DATA_WIDTH u32
DATA_TYPE type
BUFFER_OUT bit
USE_RESET bit
INITIAL_VALUE DATA_TYPE

Ports

i_clk input clock
i_rst input reset
i_clr input logic
i_mea input logic
i_wea input logic
i_adra input logic
i_da input DATA_TYPE
i_meb input logic
i_adrb input logic
o_qb output DATA_TYPE

Module Prototypes

synchronizer

synchronizer

Parameters

WIDTH u32
STAGES u32

Ports

i_clk input clock
i_rst input reset
i_d input logic
o_d output logic

Interfaces

Packages