analog M3f phase 2a: the comparator device evaluation as a clocked unit with its table ROMs, bit for bit, placed and routed on the AX7203 part (part of #11380) #11425

Part of #11380 (the comparator step on the AX7203), phase 2a. Phase 1 was #11386 (PR #11387).

Requirements

• FR-001: the device evaluation of sar_comparator_qi.t27 (one PSP103 device: current, charges, the 20 stamp words) is a clocked unit in .t27 with the tables in block-RAM ROMs, and it is bit for bit equal to the spec at every device and step tested.
• FR-002: one unit with its ROM is placed and routed on xc7a200tfbg484-2 (the openXC7 flow). The resources after routing, the post-route Fmax and the clocks per evaluation are measured and recorded, with the ROM BRAM kept apart from the logic.
• FR-003: a negative control is refused: a flipped table word makes the unit differ from the spec.

Boundary

• specs/fpga/
• docs/analog/

Success Criteria

• t27c test-report FAIL 0 and vacuous 0 on each new spec; t27b test --check exit 0 with no MISMATCH
• the resources table and the rerun steps in docs/analog/board-sar-cmp-unit-2026-10-20.md

🤖 Generated with Claude Code

User Scenarios

• Given the sar_comparator_qi.t27 specification exists, when the device evaluation is implemented as a clocked unit with its table ROMs in block-RAM, then the implementation produces bit-for-bit identical results to the specification at every device and step tested.
• Given the clocked comparator unit with its ROMs, when it is placed and routed on the xc7a200tfbg484-2 (AX7203) using the openXC7 flow, then the post-route resources, Fmax, and clocks-per-evaluation are measured and recorded with the ROM BRAM resources reported separately from logic resources.
• Given a flipped table word in the comparator's ROM, when the unit is evaluated against the specification, then the negative control is refused because the unit output differs from the spec.