pzbcm_fifo

pzbcm_fifo

https://github.com/pezy-computing/pzbcm/tree/master/pzbcm_fifo

Overview

This module implements a configurable FIFO.

Parameters

name	type/width	default value
WIDTH	int	8
TYPE	type	logic[WIDTH-1:0]
DEPTH	int	8
THRESHOLD	int	DEPTH
FLAG_FF_OUT	1	1
DATA_FF_OUT	1	1
RESET_RAM	1	0
CLEAR_DATA	1	0

• WIDTH/TYPE
  • Width/Type of the input/output data.
• DEPTH
  • Specify entries of the FIFO.
• THRESHOLD
  • Specify the threshold value for the almost full status.
• FLAG_FF_OUT
  • The output status flags (o_empty/o_almost_full/o_full) are output from FF if this value is set to 1.
• DATA_FF_OUT
  • The output data is output from FF if this value is set to 1.
• RESET_RAM
  • If this value is set to 1 the internal RAM is reset when the input reset port is asserted.
• CLEAR_DATA
  • If this value is set to 1 internal RAM and FF for the output data is cleared when the input clear port is asserted.

IO ports

name	direction	type/width	note
i_clk	input	1	clock
i_rst_n	input	1	reset (async/active low)
i_clear	input	1	the internal state is cleared when this port is asserted
o_empty	output	1	indicate no FIFO entries are not used
o_almost_full	output	1	indicate almost all FIFO entries are used
o_full	output	1	indicate all FIFO entries are used
o_word_count	output	$clog2(DEPTH + 1)	indicate how many fifo entries are used
i_push	input	1	i_data is pushed into the FIFO when this port is asserted
i_data	input	TYPE	input data
i_pop	input	1	o_data is popped from the FIFO when this port is asserted
o_data	output	TYPE	output data

• i_push is valid only when the FIFO is not full.
• i_pop is valid only when the FIFO is not empty.