UVM usage for selective dynamic re-configuration of complex designs
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1 UVM usage for selective dynamic re-configuration of complex designs Kunal Panchal Pushkar Naik Accellera Systems Initiative 1
2 Agenda Introduction Sample DUT Verification Considerations Basic Recommendations Limitations Faced Solution Proposed Flow Chart Conclusion Accellera Systems Initiative 2
3 Introduction Verification of single sub-system chip Demand for multi-subsystem chip Verification complexity of multi-subsystem chip Re-use of proven verification env(s) Accellera Systems Initiative 3
4 Multi-Subsystem Chip Accellera Systems Initiative 4
5 Sample DUT Subsystem variation parameters Rate Variation (10G, 40G ETH) Protocol Variation (ETHERNET, OTN, INTERLAKEN) Switching Fabric for Subsystem to I/O s selection using software Total 6 basic I/O channels of 10G rate each to provide 60G aggregate BW Multiple channels clubbed to form higher BW pipe Accellera Systems Initiative 5
6 10G/40G Networking PHY 60G 10G 10G 10G 10G 10G 10G CHIP PIN I/O Switching Fabric (Subsystem SW selection) 10G Ethernet Subsystem [0..2] 40G Ethernet Subsystem OTN Subsystem [0..2] Interlaken Subsystem Control Subsystem SOC with software enabled subsystem Accellera Systems Initiative 6
7 Sample Test Scenario Initial Setup 3 x 10G ETH Channels 3 x 10G OTN Channels Setup after reconfiguration 1 x 40G ETH Channel 1 x 10G OTN Channel (Untouched) 1 x 10G INTERLAKEN Channel Accellera Systems Initiative 7
8 BW allocation for Dynamic Reconfig 1st Setup: 60G Chip supporting 6x10G protocols TO Setup after reconfiguration: 60G Chip supporting 1x40G & 2x10G protocols 10G Ethernet channel 10G Ethernet channel 10G Ethernet channel 10G OTN channel 10G OTN channel 10G OTN channel 40G Ethernet channel 10G OTN channel 10G Interlaken channel Accellera Systems Initiative 8
9 Verification Considerations A DUT Subsystem with given Rate/Protocol variation forms one UVM environment A test case will create as many Env s as required by test scenario s Rate/Protocol requirement Accellera Systems Initiative 9
10 Multi-Environment Test Bench TESTBENCH Ethernet Subsystem Env(s) TESTCASE VIF_E Connection agent OTN Subsystem Env(s) VIF_O text (Enable/disable paths as per configuration) VIF_TOP REAL_IF DUT VIF_I Interlaken Subsystem Env(s) Accellera Systems Initiative 10
11 Verification Considerations Interface connections An interface with all signals across all DUT features is created Each Env has its own Virtual Interface instance created of above Interface type Idea is that respective Env touches only those signals that it is supposed to A top level Virtual Interface instance is created, again of same interface type, that finally connects to DUT s Real Interface As per Env s active status, its local VIF is connected to the top level VIF, using the connection agent shown Accellera Systems Initiative 11
12 Basic Recommendations Use uvm_config_db for Env components config Env components with enable/disable config as per datapath(sb, mon, drv, etc) Configurable clocks as per Reconfig requirements Proven tests of every subsystem env, tested individually, forms base for Dynamic Reconfig Test Scenario s Reset to all TB components and DUT must be in sync, and placed in reset_phase Any DUT specific reset requirements at the time of reconfig should be carefully taken care of Accellera Systems Initiative 12
13 Basic Recommendations Data sequences lifetime need to be adjusted correctly Env s untouched need to have sequence(s) running till end of test Env s being phased out need to have their sequence(s) end right at Reconfig time (Graceful exit) New Env s being created need to start sequence(s) after they are correctly configured/connected. Common Reconfig tasks to be placed in base_test for all test scenario s to leverage upon Untouched channels should not loose data integrity, ever Newly made active channels should eventually establish data integrity Accellera Systems Initiative 13
14 Limitations Faced Large configuration requirement of components against standard approach UVM s constraint on creation of components outside build_phase UVM s restriction on connection of TLM ports outside connect_phase UVM s phase looping feature cannot be used for Reconfig since few Env s are required to continue their data sequences untouched while few new are required to be created Accellera Systems Initiative 14
15 Solution Proposed As per test scenario, all the required environments (both pre and post reconfig) will be created in build_phase TLM port connections, if any, will be done in connect_phase Switching of Env s is done using dynamic connection of Env s local VIF to the top level VIF during the main_phase Logs reported from all env(s) to conclude test Pass/Fail Accellera Systems Initiative 15
16 Multi- Channel Reconfig Flow Chart Create all env(s) required in Test scenario Perform component connections as usual. Push all env(s) used for 1 st setup in a Q & assign channel number to each Enable environment components, configure DUT channels as per env(s) in Q build_phase() connect_phase() configure_phase() Insert new env(s) into Q. Perform Wait component only those Enable Assign 2 environment Disable connections Start Create channel sequence(s) 1 nd all env(s) as usual. components, st vif_top setup: to 2nd current setup: env(s) of Report env_vif, Start Wait sequence(s) for component complete Push required all 1 st all running configure env logs of Channel on sequence(s) env(s) channels in reconfiguration setup undergoing to which end Test env(s) are that env(s) DUT config sequence(s) for channels all in and env(s) Q which enable to as in end per Q are it. in Q reconfiguration not & needs required? Scenario assign started to channel be yet not Perform env(s) started in DUT Q yet number reconfigured to each configuration. Start sequence(s) of env(s) in Q which are not started yet Channel reconfiguration required? NO Wait for all running sequence(s) to end Report component logs for all env(s) in Q main_phase() YES shutdown_phase Disable current env(s) on channels undergoing reconfiguration Insert new env(s) into Q. Assign vif_top to env_vif, complete env config & enable it. Perform DUT configuration Wait for only those channel env sequences to end that needs to be reconfigured End of Test Accellera Systems Initiative 16
17 8 env: 3x10G enet, 3x10G otn, 40G enet, 10G ikn 1 st Setup for 6 channels: 3x10G enet, 3x10G otn Create all env(s) required in Test scenario Perform component connections as usual. Push all env(s) used for 1 st setup in a Q & assign channel number to each Enable environment components, configure DUT channels as per env(s) in Q build_phase() connect_phase() configure_phase() main_phase() Disable 3x10G enet on ch 0-2 and 2xotn on ch 3&5. (stop clocks, mon, drv, etc) Start seq(s) of env in Q (3x10G enet, 3x10G otn env) Wait for seq(s) to end for inst 40G enet on ch0, 10G otn on ch4 and 10G ikn on ch5 Start sequence(s) of env(s) in Q which are not started yet Channel reconfiguration required? NO Wait for all running sequence(s) to end Report component logs for all env(s) in Q YES shutdown_phase Disable current env(s) on channels undergoing reconfiguration Insert new env(s) into Q. Assign vif_top to env_vif, complete env config & enable it. Perform DUT configuration Wait for only those channel env sequences to end that needs to be reconfigured End of Test Add 40G enet on ch 0 & 10G ikn on ch 5. Assign env_vif to top_vif Wait for seq(s) on ch 0-3 and 5 to end (ch 4 is untouched) Accellera Systems Initiative 17
18 Conclusion Multi-subsystem Chips with Dynamic Reconfig requirement UVM limitations due to phasing structure Components require heavy configurability Paper proposes a work-around : Create all required env(s) at start and switch environments by controlling the Virtual Interface connection(s) during reconfiguration Accellera Systems Initiative 18
19 Questions Accellera Systems Initiative 19
UVM usage for selective dynamic re-configuration of complex designs
UVM usage for selective dynamic re-configuration of complex designs Kunal Panchal, Applied Micro, Pune, India (kunal.r.panchal@gmail.com) Pushkar Naik, Applied Micro, Pune, India (pushkar.naik@gmail.com)
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