V2.0.0 hardware freeze - single SDRAM
FASE #1 hardware freeze for FPGA-Neural V2, N4/P8, single external SDRAM (Alliance Memory AS4C4M16SA-6TIN) serving weights, activations, and results through one physical sdram_controller.v instance. Removes the PSRAM dependency (hardware/v1/rtl/psram_controller.v + memory_interface.v) from the V2 physical path entirely -- V1 itself remains fully unmodified, the golden reference. New RTL: sdram_unified_backend.v (2-way W/AR arbitration over one SDRAM controller, real per-byte DQM write masking added to sdram_controller.v for correct single-byte result writes with no read-modify-write), nms_neural_multiprocessor_sdram_unified.v (the frozen top-level). Two real bugs found and fixed via full-system testing before being accepted (ERR-0023): a deadlock and an off-by-one data-shift bug in the new arbitration logic. Real results: N=4 and N=2 D-Stress bit-exact (256/256 neurons), 40 real AUTO REFRESH events interleaved with zero corruption, real Yosys+nextpnr-ecp5 synthesis/P&R for LFE5U-45F-8CABGA381 (149/245 TRELLIS_IO, a real 45-pin reduction from the prior dual-memory design). Timing is MARGINAL (1/8 P&R seeds >=80MHz), reported honestly rather than masked by the best seed. Real, sourced ball-level pinout for the SDRAM bus + clk/rst (39/149 signals, P&R-verified) using the official Lattice ECP5U-45 pinout CSV found on disk during this step's own pre-commit review -- corrects an earlier draft that wrongly assumed no real pinout data was available. Chip readiness: NO. Real, disclosed blockers remain (no physical host interface exists yet -- the RTL's own reg_* ports are a 110-pin raw test-harness bus; clock source/PLL decision; power/configuration component selection) -- see hardware/v2/docs/{HARDWARE_FREEZE, CHIP_READINESS,OPEN_ITEMS}.md for the complete, itemized status. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
This commit is contained in:
Claude Sonnet 5
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Info: Logic utilisation before packing:
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Info: Total LUT4s: 40/43848 0%
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Info: logic LUTs: 16/43848 0%
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Info: carry LUTs: 0/43848 0%
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Info: RAM LUTs: 16/ 5481 0%
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Info: RAMW LUTs: 8/10962 0%
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Info: Total DFFs: 56/43848 0%
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Info: Packing IOs..
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Info: Packing constants..
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Info: Packing carries...
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Info: Packing LUTs...
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Info: Packing LUT5-7s...
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Info: Packing FFs...
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Info: 32 FFs paired with LUTs.
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Info: Generating derived timing constraints...
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Info: Promoting globals...
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Info: promoting clock net clk$TRELLIS_IO_IN to global network
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Info: Checksum: 0xd1317d1e
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Info: Device utilisation:
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Info: TRELLIS_IO: 18/ 245 7%
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Info: DCCA: 1/ 56 1%
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Info: DP16KD: 0/ 108 0%
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Info: MULT18X18D: 0/ 72 0%
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Info: ALU54B: 0/ 36 0%
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Info: EHXPLLL: 0/ 4 0%
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Info: EXTREFB: 0/ 2 0%
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Info: DCUA: 0/ 2 0%
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Info: PCSCLKDIV: 0/ 2 0%
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Info: IOLOGIC: 0/ 160 0%
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Info: SIOLOGIC: 0/ 85 0%
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Info: GSR: 0/ 1 0%
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Info: JTAGG: 0/ 1 0%
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Info: OSCG: 0/ 1 0%
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Info: SEDGA: 0/ 1 0%
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Info: DTR: 0/ 1 0%
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Info: USRMCLK: 0/ 1 0%
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Info: CLKDIVF: 0/ 4 0%
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Info: ECLKSYNCB: 0/ 10 0%
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Info: DLLDELD: 0/ 8 0%
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Info: DDRDLL: 0/ 4 0%
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Info: DQSBUFM: 0/ 10 0%
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Info: TRELLIS_ECLKBUF: 0/ 8 0%
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Info: ECLKBRIDGECS: 0/ 2 0%
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Info: DCSC: 0/ 2 0%
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Info: TRELLIS_FF: 56/ 43848 0%
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Info: TRELLIS_COMB: 42/ 43848 0%
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Info: TRELLIS_RAMW: 4/ 5481 0%
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Info: Placed 0 cells based on constraints.
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Info: Creating initial analytic placement for 45 cells, random placement wirelen = 4304.
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Info: at initial placer iter 0, wirelen = 1329
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Info: at initial placer iter 1, wirelen = 1030
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Info: at initial placer iter 2, wirelen = 966
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Info: at initial placer iter 3, wirelen = 959
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Info: Running main analytical placer, max placement attempts per cell = 10000.
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Info: at iteration #1, type ALL: wirelen solved = 956, spread = 1017, legal = 1022; time = 0.00s
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Info: HeAP Placer Time: 0.02s
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Info: of which solving equations: 0.00s
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Info: of which spreading cells: 0.00s
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Info: of which strict legalisation: 0.00s
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Info: Running simulated annealing placer for refinement.
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Info: at iteration #1: temp = 0.000000, timing cost = 19, wirelen = 1022
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Info: at iteration #5: temp = 0.000000, timing cost = 24, wirelen = 822
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Info: at iteration #10: temp = 0.000000, timing cost = 20, wirelen = 797
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Info: at iteration #12: temp = 0.000000, timing cost = 28, wirelen = 806
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Info: SA placement time 0.01s
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Info: Max frequency for clock '$glbnet$clk$TRELLIS_IO_IN': 654.02 MHz (PASS at 80.00 MHz)
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Info: Max delay <async> -> posedge $glbnet$clk$TRELLIS_IO_IN: 4.40 ns
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Info: Max delay posedge $glbnet$clk$TRELLIS_IO_IN -> <async> : 4.67 ns
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Info: Slack histogram:
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Info: legend: * represents 1 endpoint(s)
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Info: + represents [1,1) endpoint(s)
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Info: [ 10971, 11010) |*******************
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Info: [ 11010, 11049) |
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Info: [ 11049, 11088) |******
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Info: [ 11088, 11127) |*******************************
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Info: [ 11127, 11166) |
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Info: [ 11166, 11205) |******
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Info: [ 11205, 11244) |****************************
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Info: [ 11244, 11283) |
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Info: [ 11283, 11322) |**********
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Info: [ 11322, 11361) |****
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Info: [ 11361, 11400) |****
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Info: [ 11400, 11439) |********
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Info: [ 11439, 11478) |
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Info: [ 11478, 11517) |******
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Info: [ 11517, 11556) |**
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Info: [ 11556, 11595) |
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Info: [ 11595, 11634) |*************
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Info: [ 11634, 11673) |
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Info: [ 11673, 11712) |
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Info: [ 11712, 11751) |*************
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Info: Checksum: 0x5249d1ff
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Info: Routing globals...
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Info: routing clock net $glbnet$clk$TRELLIS_IO_IN using global 0
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Info: Routing..
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Info: Setting up routing queue.
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Info: Routing 300 arcs.
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Info: | (re-)routed arcs | delta | remaining| time spent |
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Info: IterCnt | w/ripup wo/ripup | w/r wo/r | arcs| batch(sec) total(sec)|
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Info: 324 | 23 301 | 23 301 | 0| 0.09 0.09|
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Info: Routing complete.
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Info: Router1 time 0.09s
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Info: Checksum: 0xb595ea98
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Info: Critical path report for clock '$glbnet$clk$TRELLIS_IO_IN' (posedge -> posedge):
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Info: type curr total name
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Info: clk-to-q 0.40 0.40 Source lfsr_TRELLIS_FF_Q_13.Q
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Info: routing 0.94 1.33 Net fill_addr[1] (34,35) -> (36,36)
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Info: Sink dut.GEN_COPY[0].mem.0.1$DPRAM_COMB1.B
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Info: Defined in:
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Info: hardware/v2/nms/synthesis/harness_nms_activation_replicated.v:37.24-37.29
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Info: logic 0.18 1.51 Source dut.GEN_COPY[0].mem.0.1$DPRAM_COMB1.F
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Info: routing 0.12 1.63 Net dut.GEN_COPY[0].mem.0.0_DO[5] (36,36) -> (36,36)
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Info: Sink dut.GEN_COPY[0].rd_data_reg_TRELLIS_FF_Q_6.DI
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Info: setup 0.00 1.63 Source dut.GEN_COPY[0].rd_data_reg_TRELLIS_FF_Q_6.DI
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Info: 0.57 ns logic, 1.05 ns routing
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Info: Critical path report for cross-domain path '<async>' -> 'posedge $glbnet$clk$TRELLIS_IO_IN':
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Info: type curr total name
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Info: source 0.00 0.00 Source rst$tr_io.O
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Info: routing 2.96 2.96 Net rst$TRELLIS_IO_IN (0,38) -> (36,37)
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Info: Sink seed_LUT4_B_Z_LUT4_Z_1.C
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Info: Defined in:
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Info: hardware/v2/nms/synthesis/harness_nms_activation_replicated.v:22.17-22.20
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Info: logic 0.18 3.14 Source seed_LUT4_B_Z_LUT4_Z_1.F
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Info: routing 0.12 3.26 Net seed_LUT4_B_Z[7] (36,37) -> (36,37)
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Info: Sink lfsr_TRELLIS_FF_Q_24.DI
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Info: setup 0.00 3.26 Source lfsr_TRELLIS_FF_Q_24.DI
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Info: 0.18 ns logic, 3.08 ns routing
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Info: Critical path report for cross-domain path 'posedge $glbnet$clk$TRELLIS_IO_IN' -> '<async>':
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Info: type curr total name
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Info: clk-to-q 0.40 0.40 Source chk_TRELLIS_FF_Q_2.Q
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Info: routing 2.77 3.16 Net checksum[2]$TRELLIS_IO_OUT (32,36) -> (42,0)
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Info: Sink checksum[2]$tr_io.I
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Info: Defined in:
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Info: hardware/v2/nms/synthesis/harness_nms_activation_replicated.v:50.15-50.18
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Info: 0.40 ns logic, 2.77 ns routing
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Info: Max frequency for clock '$glbnet$clk$TRELLIS_IO_IN': 613.87 MHz (PASS at 80.00 MHz)
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Info: Max delay <async> -> posedge $glbnet$clk$TRELLIS_IO_IN: 3.26 ns
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Info: Max delay posedge $glbnet$clk$TRELLIS_IO_IN -> <async> : 3.16 ns
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Info: Slack histogram:
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Info: legend: * represents 1 endpoint(s)
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Info: + represents [1,1) endpoint(s)
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Info: [ 10871, 10918) |*************
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Info: [ 10918, 10965) |***
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Info: [ 10965, 11012) |**
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Info: [ 11012, 11059) |
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Info: [ 11059, 11106) |******
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Info: [ 11106, 11153) |**************
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Info: [ 11153, 11200) |************************
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Info: [ 11200, 11247) |******
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Info: [ 11247, 11294) |**
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Info: [ 11294, 11341) |********************
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Info: [ 11341, 11388) |****************
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Info: [ 11388, 11435) |******
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Info: [ 11435, 11482) |**
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Info: [ 11482, 11529) |***
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Info: [ 11529, 11576) |***
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Info: [ 11576, 11623) |**********
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Info: [ 11623, 11670) |
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Info: [ 11670, 11717) |******
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Info: [ 11717, 11764) |***
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Info: [ 11764, 11811) |***********
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Info: Program finished normally.
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