All the hdl (verilog and vhdl) source files were updated. If a file did not
have any license, it was added into it. Files, which were generated by
a tool (like Matlab) or were took over from other source (like opencores.org),
were unchanged.
New license looks as follows:
Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
Each core or library found in this collection may have its own licensing terms.
The user should keep this in in mind while exploring these cores.
Redistribution and use in source and binary forms,
with or without modification of this file, are permitted under the terms of either
(at the option of the user):
1. The GNU General Public License version 2 as published by the
Free Software Foundation, which can be found in the top level directory, or at:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
OR
2. An ADI specific BSD license as noted in the top level directory, or on-line at:
https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
For a better timing and control, the valid control lines are gated with flops, instead of combinatorial logic.
This is the main reason why we do not need the tdd_enable_synced signal anymore. The out coming data is delayed by one clock cycle to keep data and control lines synced.
+ Define two control signal for util_tdd_sync : tdd_sync_en and tdd_terminal_type
+ Delete to old ad_tdd_sync.v instances from the core
+ Update Make files
+ Update ad_tdd_control: add additional CDC logic for tdd_sync (the sync comes from another clock domain)
+ Update the ad_tdd_sync module: it's just a simple pulse generator, the pulse period is defined using a parameter, pulse width is fixed: 128 x clock cycle
+ Update TDD regmap: tdd sync period is no longer software defined
The synchronization interface is a single bidirectional line. Output for Master, input for Slave.
The sync_period value is relative to frame length and the digital interface clock. The actual synchronization
period will be: sync_period * frame_length * fb_clock_cycle
This line controls the mux, which switch between hdl and software (GPIO) control of the ENABLE/TXNRX pins.
Fix the broken path and change the name from "tdd_enable" to "tdd_enabled".
Supported carrier are ZC706 and RFSOM.
The synchronization pulse is automatically generated by the master terminal, when TDD mode is enabled.
By default a terminal is slave, software must write 0x01 into TDD register 0x50.
Add tdd_gated_[tx/rx]_dmapath control bits to the TDD logic. With these control line, the user can choose between gated and free-running (like in FDD mode) data flow control.
In FDD mode the tx_valid_* signals are generated inside the axi_ad9361_tx module, in function of
the selected dac data rate. In TDD mode, these signals are gated by the tdd_enable and tdd_tx_dp_en signals.
In other words, the tx_valid_* signals will be valid just when tdd_enable and tdd_tx_dp_en is active.
+ Delete unnecessary registers
+ Add the module ad_addsub.v to resolve additions and subtractions inside TDD control
+ Redefine the burst logic
+ Redesign the control signal generations
+ Note: This patch fix the TDD related timing violations
David Winter
Istvan Csomortani