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Changes to reply to issue #2403, #2407 and #2408 #2409

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31bcffe
Changes to reply to issue #2403, #2407 and #2408
ludovicpion Apr 12, 2024
ba443fb
remove artificial layer of heirarchy (bp_gen/bp_gen). It was a mistake
ludovicpion Apr 15, 2024
8b07974
remove artificial layer of heirarchy (bp_gen/bp_gen). It was a mistake
ludovicpion Apr 15, 2024
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202 changes: 202 additions & 0 deletions lib/cv_dv_utils/uvm/bp_gen/LICENSE
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Copyright 2023 CEA*
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22 changes: 10 additions & 12 deletions lib/cv_dv_utils/uvm/bp_gen/Makefile
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# ----------------------------------------------------------------------------
# Copyright 2023 CEA*
# *Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA)
#Copyright 2023 CEA*
#*Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA)
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#limitations under the License.
#[END OF HEADER]
# ----------------------------------------------------------------------------
# ----------------------------------------------------------------------------
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53 changes: 45 additions & 8 deletions lib/cv_dv_utils/uvm/bp_gen/README.md
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Expand Up @@ -3,15 +3,15 @@
## Introduction

The Back Pressure (BP) Gererator is a SystemVerilog UVM module which can generate back-pressure.
It is important to note that virtual sequencer / sequences are not provided with the bp_gen package. It is up to the user to implement his/her own virtual sequencer / sequences to be able to chose between one of the four sequences provided (see sequence's part hereafter)
The bp_gen package provides a virtual sequencer that user can use to be able to choses between one of the four sequences provided (see sequence's part hereafter).

## Configuration

Users can either use one the existing sequences (see in the next part below) or create their own sequence to configure the BP type() (OFF or ON, the duration cycle and the percentage (or frequency rate))
Users can either use one of the existing sequences (see in the next part below) or create their own sequence to configure the BP type() (OFF or ON, the duration cycle and the percentage (or frequency rate))

```
typedef enum { BP_OFF=0, // BP OFF - for N, number of indicated clocks
BP_ON=1, // BP ON - for N, number of indicated clocks,
BP_ON=1, // BP ON - for N, number of indicated clocks,
BP_TOGGLE=2, // BP toggles every Mth cycles for N clocks
BP_PERCENT=3 } // BP is asserted M% of the time for N clocks
bp_drive_type_t;
Expand All @@ -26,6 +26,31 @@ Users can either use one the existing sequences (see in the next part below) or

```

If user uses the virtual sequence provided with the bp_gen, s(h)e should configure following fields (see example in the section "integration guide")
```
typedef enum {
NO_BP, // selects no_bp_sequence
HEAVY_BP, // selects heavy_bp_sequence
OCCASSIONAL_BP, // selects occassional_bp_sequence
MOSTLY_BP // selects mostly_bp sequence
} bp_type_t;

// In the virtual sequence following fields need to be passe

// Type of the back pressure to be applied
bp_type_t which_bp;
/// Target Agent Sequencers
bp_sequencer bp_sqr;

```

## APIs
The virtual sequence provides following APIs to set bp_type and sequencer
```
function void set_bp_type(bp_type_t bp);
function void set_bp_sequencer(bp_sequencer sqr);
```

## Sequence

Sequence where bp type is always at BP_OFF
Expand Down Expand Up @@ -55,6 +80,8 @@ This guide is based on the example of a AXI interface
### 1. In the top ENV: Instantiate and create clock driver

```
import bp_driver_pkg::*;

bp_agent aw_bp_agent ;
bp_agent w_bp_agent ;
bp_agent b_bp_agent ;
Expand Down Expand Up @@ -88,16 +115,26 @@ This guide is based on the example of a AXI interface
#### Connect phase

```
aw_bp_vseq.bp_sqr = aw_bp_agent.m_sequencer ;
w_bp_vseq.bp_sqr = w_bp_agent.m_sequencer ;
b_bp_vseq.bp_sqr = b_bp_agent.m_sequencer ;
ar_bp_vseq.bp_sqr = ar_bp_agent.m_sequencer ;
r_bp_vseq.bp_sqr = r_bp_agent.m_sequencer ;
// Sequencer to virtual sequence
aw_bp_vseq.set_bp_sequencer(aw_bp_agent.m_sequencer);
w_bp_vseq.set_bp_sequencer(w_bp_agent.m_sequencer ) ;
b_bp_vseq.set_bp_sequencer(b_bp_agent.m_sequencer ) ;
ar_bp_vseq.set_bp_sequencer(ar_bp_agent.m_sequencer);
r_bp_vseq.set_bp_sequencer(r_bp_agent.m_sequencer ) ;

// BP type to virtuals sequence
aw_bp_vseq.set_bp_type(aw_bp_cfg.m_bp_type) ;
w_bp_vseq.set_bp_type(w_bp_cfg.m_bp_type) ;
b_bp_vseq.set_bp_type(b_bp_cfg.m_bp_type) ;
ar_bp_vseq.set_bp_type(ar_bp_cfg.m_bp_type) ;
r_bp_vseq.set_bp_type(r_bp_cfg.m_bp_type) ;
```

### 2. In the TestBench Top

```
import bp_driver_pkg::*;

bp_vif #(1) aw_bp ( .clk( clk_i ), .rstn( reset_n ) );
bp_vif #(1) w_bp ( .clk( clk_i ), .rstn( reset_n ) );
bp_vif #(1) b_bp ( .clk( clk_i ), .rstn( reset_n ) );
Expand Down
23 changes: 10 additions & 13 deletions lib/cv_dv_utils/uvm/bp_gen/bp_agent.svh
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// ----------------------------------------------------------------------------
// Copyright 2023 CEA*
// *Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA)
//Copyright 2023 CEA*
//*Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA)
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//[END OF HEADER]
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// Description : This holds a UVM agent for generating back-pressure.
//
//
Expand Down
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