hw: added 2x VLSU bandwidth and TROOP optimizations for Spatz #50
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DiyouS
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Jan 26, 2026
| "n_ipu": 1, | ||
| "spatz_fpu": true, | ||
| "spatz_nports": 4, | ||
| "double_bw": 0, |
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Why we have both number of ports value and double_bw? Should we be able to automatically enable double_bw based on the number of ports?
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Ideally yes. For now it is to keep it flexible. We could have a smaller Spatz with 2 FPUs, but still using double bandwidth.
DiyouS
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In general looks quite good to me. One question I have: do you think we should add a CI test for double-bw configuration?
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To add feature to support for double VLSU bandwidth to L1 scratchpad in Spatz cluster to accelerate memory-intensive workloads. This configuration can be enabled by setting
double_bwparameter in spatz configuration file and doubling the number ofspatz_nportsw.r.t number of functional units (assuming 64b granularity).Added
spatz_doublebw_vlsu.sv- To implement the load-store functionality to generatespatz_nportsparallel requests across 2 interfaces and commit each interface separately back to theVRF, synchronizing between them only at instruction completion.spatz.sv,spatz_controller.sv,spatz_vrf.svis enclosed with the pragmaDOUBLE_BW.spatz_tcdm_interconnect.svto misalign VLSU requests to avoid conflicts at the L1 for varyingLMULconfigurations.dp-fdotpanddp-faxpyfor higher performance configurable using a-DUNROLLcmake option.spatz_cluster.doublebw.dram.hjson- configuration with double bw support to the default spatz core configuration.