Entity: ad_sysref_gen
- File: ad_sysref_gen.v
Diagram
Description
Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
In this HDL repository, there are many different and unique modules, consisting of various HDL (Verilog or VHDL) components. The individual modules are developed independently, and may be accompanied by separate and unique license terms.
The user should read each of these license terms, and understand the freedoms and responsibilities that he or she has by using this source/core.
This core is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Redistribution and use of source or resulting binaries, with or without modification of this file, are permitted under one of the following two license terms:
- The GNU General Public License version 2 as published by the Free Software Foundation, which can be found in the top level directory of this repository (LICENSE_GPL2), and also online at: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
OR
- An ADI specific BSD license, which can be found in the top level directory of this repository (LICENSE_ADIBSD), and also on-line at: https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD This will allow to generate bit files and not release the source code, as long as it attaches to an ADI device.
Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| SYSREF_PERIOD | 128 | SYSREF period is multiple of core_clk, and has a duty cycle of 50% NOTE: if SYSREF always on (this is a JESD204 IP configuration), the period must be a correct multiple of the multiframe period |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| core_clk | input | ||
| sysref_en | input | ||
| sysref_out | output |
Signals
| Name | Type | Description |
|---|---|---|
| counter | reg [ 7:0] | |
| sysref_en_m1 | reg | |
| sysref_en_m2 | reg | |
| sysref_en_int | reg |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| SYSREF_HALFPERIOD | SYSREF_PERIOD/2 - 1 |
Processes
- unnamed: ( @(posedge core_clk) )
Type: always
Description
bring the enable signal to JESD core clock domain
- unnamed: ( @(posedge core_clk) )
Type: always
Description
free running counter for periodic SYSREF generation
- unnamed: ( @(posedge core_clk) )
Type: always
Description
generate SYSREF