Intelligent BIST Solution Integrating RCD, DB & Memory Controller for RDIMM/LRDIMM Verification
The Deep-I Memory Buffer Self-Tester is an integrated intelligent testing solution that combines our Si-proven RCD, Data Buffer (DB), and Memory Controller (MC) IP with advanced Built-In Self-Test (BIST) engines to provide end-to-end autonomous verification of RDIMM and LRDIMM memory modules. By embedding the tester logic on-chip, the self-tester eliminates the need for expensive external ATE equipment, enabling CK/CA path validation through the RCD, DQ/DQS path validation through the DB, full memory controller protocol exercising, and complete DIMM-level stress testing — all driven by on-chip BIST pattern generators and checkers with per-DQ, per-DQS, and per-CA granularity.
Integrated RCD, DB, and Memory Controller BIST engines for autonomous RDIMM/LRDIMM verification
without external ATE — the tester is the chip itself.
CK/CA path self-test: exercises the full RCD signal chain including PLL lock verification, CA parity checking, DCS/DCA training mode validation, ALERT_n assertion testing, and per-subchannel loopback through the RCD. Validates fly-by routing integrity to every DRAM position.
CK/CA Path TestDQ/DQS path self-test: per-DQ and per-DQS PRBS pattern generation and self-checking through each Data Buffer. Validates bidirectional data flow, DQS regeneration, DFE equalization, ZQ calibration, and BCOM sideband protocol across all 10 DBs on LRDIMM.
DQ/DQS Path TestFull MC protocol exerciser: generates JEDEC-compliant command sequences (ACT, RD, WR, PRE, REF, MRS) with correct timing, scheduler stress patterns, multi-rank interleaving, and power management mode transitions (self-refresh, power-down, DVFS) to stress the entire DIMM under realistic workloads.
Protocol ExerciserOn-chip eye margin shmoo: sweeps voltage and timing across the data eye to generate 2D BER contour maps per DQ lane. DESTM-compatible real-time signal quality monitoring. Reports pass/fail with programmable BER threshold (target <10⁻¹²) and margin budgets for production screening.
Signal Quality TestOn-chip BIST replaces external ATE — autonomous verification from RCD through DB to DRAM
Eliminate external ATE cost, accelerate time-to-market, guarantee first-time-right modules
On-chip BIST engines eliminate the need for multi-million-dollar external ATE equipment. Self-test runs autonomously at power-on or on-demand via I3C sideband trigger, reducing test cost per module dramatically.
Parallel self-test of RCD CK/CA path + DB DQ/DQS path + MC protocol in a single power-on sequence. Complete DIMM-level validation in seconds instead of hours on external testers.
Per-DQ, per-DQS, and per-CA testing isolates failures to individual signal lanes. 2D BER eye contour maps per lane enable precise margin budgeting for production screening and debug.
Comprehensive BIST coverage across every signal path on the DIMM
Supports PRBS-7, PRBS-15, PRBS-23, PRBS-31 and custom user-defined patterns. Walking-1, walking-0, checkerboard, and worst-case SSO (simultaneous switching output) patterns for comprehensive SI/PI stress.
RCD loopback (CA pass-through), DB loopback (DQ internal loop), and MC-to-DRAM full-path loop-back modes. Each loop isolates a specific segment of the signal chain for targeted fault localization.
On-chip voltage/timing shmoo generates 2D BER contour maps in real-time. DESTM-compatible diagnostics. Programmable BER threshold (10⁻⁹ to 10⁻¹⁵) with automatic pass/fail classification and margin reporting via I3C.
Integrated BIST solutions for RDIMM, LRDIMM, and MRDIMM qualification at every stage.
Complete LRDIMM self-test: RCD BIST (CK/CA/parity/ALERT_n) + 10-DB BIST (per-DQ/DQS PRBS, ZQ cal verify) + MC protocol exerciser + eye margin shmoo. Single-chip integration replaces full ATE rack.
RDIMM-focused self-test: RCD BIST (CK/CA/PLL/parity) + MC protocol exerciser with direct DQ/DQS loop-back to DRAM. Validates fly-by routing, multi-rank training, and thermal margin.
Standalone memory controller BIST: generates JEDEC-compliant ACT/RD/WR/PRE/REF/MRS command sequences with programmable timing, scheduler stress, and power mode transitions for DIMM-level protocol validation.
Next-gen MRDIMM self-test: MRCD + MDB BIST with multiplexed rank interleaving verification, 12.8 Gb/s data-path stress, and 2× bandwidth validation for AI/HPC data center qualification.
Why on-chip BIST replaces traditional memory test equipment
Cost, speed, and coverage comparison
Autonomous power-on self-test validates every signal path on the DIMM in seconds.
BIST engine triggers PLL lock verification, RCD reset sequence via I2C/I3C, and initial control word configuration. Validates clock stability and duty-cycle correction before any data testing begins.
RCD enters DCS/DCA training mode. BIST generates CA test patterns on both clock edges (DDR mode), RCD loopback returns via ALERT_n or QLBD/QLBS feedback. Per-subchannel CA bit testing with parity verification. Validates fly-by routing to every DRAM position.
Each of 10 DBs enters loopback mode via BCOM. BIST generates per-DQ PRBS patterns (PRBS-7/15/23/31) through host-side TX → DB internal loop → host-side RX. Per-DQ error counter and BER calculation. ZQ calibration verification per DB. Walking-1 and SSO patterns for SI/PI stress.
MC protocol exerciser sends full JEDEC command sequences (ACT/RD/WR/PRE/REF) through RCD to DRAM, data through DB to DRAM and back. Multi-rank interleaving, power-mode transitions, and 2D eye margin shmoo with BER contour mapping per DQ lane. Final pass/fail report via I3C.
Autonomous BIST replaces million-dollar ATE — watch the complete test sequence.
Contact our team to discover how the Deep-I Memory Buffer Self-Tester can cut your DIMM qualification cost and time while improving test coverage and diagnostic granularity.