Entity: neorv32_fifo
- File: neorv32_fifo.vhd
Diagram
Description
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<< NEORV32 - General Purpose FIFO Component >>
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BSD 3-Clause License
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Copyright (c) 2021, Stephan Nolting. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice, this list of
conditions and the following disclaimer in the documentation and/or other materials
provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors may be used to
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting
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Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| FIFO_DEPTH | natural | number of fifo entries; has to be a power of two; min 1 | |
| FIFO_WIDTH | natural | size of data elements in fifo | |
| FIFO_RSYNC | boolean | false = async read; true = sync read | |
| FIFO_SAFE | boolean | true = allow read/write only if entry available |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| clk_i | in | std_ulogic | clock, rising edge |
| rstn_i | in | std_ulogic | async reset, low-active |
| clear_i | in | std_ulogic | sync reset, high-active |
| level_o | out | std_ulogic_vector(index_size_f(FIFO_DEPTH) downto 0) | fill level |
| wdata_i | in | std_ulogic_vector(FIFO_WIDTH-1 downto 0) | write data |
| we_i | in | std_ulogic | write enable |
| free_o | out | std_ulogic | at least one entry is free when set |
| re_i | in | std_ulogic | read enable |
| rdata_o | out | std_ulogic_vector(FIFO_WIDTH-1 downto 0) | read data |
| avail_o | out | std_ulogic | data available when set |
Signals
| Name | Type | Description |
|---|---|---|
| fifo | fifo_t |
Types
| Name | Type | Description |
|---|---|---|
| fifo_data_t | ||
| fifo_t |
Processes
- fifo_control: ( rstn_i, clk_i )
Description
FIFO Control --------------------------------------------------------------------------- -------------------------------------------------------------------------------------------
- fifo_memory_write: ( clk_i )
Description
FIFO Memory ---------------------------------------------------------------------------- -------------------------------------------------------------------------------------------