Infineon Technologies CYD04S18V-167BBC

Overview

CYD04S18V-167BBC from Cypress Semiconductor is a 4-Mbit (256K × 18) synchronous, true dual-port SRAM with pipelined operation, 3.3V supply, and 167 MHz clock frequency. It supports simultaneous independent read/write access on left and right ports, features mailbox-based inter-port messaging, JTAG boundary scan, and integrated burst address counters with mask/retx/interrupt control - deployed in high-throughput FPGA co-processing and real-time DSP data buffering systems.

For engineers reviewing the CYD04S18V-167BBC datasheet, CYD04S18V-167BBC pinout, CYD04S18V-167BBC application, or CYD04S18V-167BBC equivalent, key selection criteria include dual-port arbitration timing, counter wrap behavior, byte-enable granularity, mailbox interrupt latency, and FBGA-256 thermal/mechanical compatibility in multi-clock-domain systems.

Technical Context

This device implements two fully independent synchronous ports sharing a single 256K × 18-bit memory array, with register-controlled address counters per port that support programmable wrap-around via mask registers and retransmit reload from mirror registers. Each port includes dedicated CE0/CE1 enables, R/W, OEN, BE0/BE1, and interrupt-capable signals (INTL/INTR, CNTINTL/CNTINTR).

Arbitration is handled by internal logic detecting simultaneous writes to the same location - resulting in undefined data - while BUSYL/BUSYR flags indicate contention. The JTAG TAP controller (TCK/TMS/TDI/TDO/TRST) operates independently of memory clocks and supports IEEE 1149.1-compliant boundary scan for board-level testability.

Key Specifications

Pinout & Package

Package: 256-ball Fine-Pitch Ball Grid Array (FBGA), 17 mm × 17 mm, 1 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous dual-port SRAM applications.

Compared with IDT70V27L15PF8 and IS61WV102418BLL-15BLI, CYD04S18V-167BBC delivers deterministic 167 MHz synchronous operation, hardware mailbox signaling, and programmable burst counters - making it uniquely suitable for high-performance, multi-clock-domain embedded systems requiring zero-latency inter-processor communication.

Availability

CYD04S18V-167BBC is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA co-processing, industrial motion control, and avionics sensor fusion applications requiring stable component supply across extended product lifecycles.

Supply support for CYD04S18V-167BBC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.

CYD04S18V belongs to the FLEx18™ synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency data exchange between heterogeneous processors and FPGAs in real-time embedded systems.

FAQ

What is the function of the CNT/MSKL and CNT/MSKR pins?

CNT/MSKL and CNT/MSKR are port-specific control inputs that select between burst counter mode and mask register load mode. When asserted, they enable writing to the mask register; when deasserted, they allow the counter register to increment or be loaded via ADS. This dual-function pin reduces pin count while supporting both counter configuration and runtime address generation.

Can CYD04S18V-167BBC operate with different clock frequencies on left and right ports?

Yes - the left and right ports are fully asynchronous and support independent clock domains. CL and CR accept separate 167 MHz clocks with no phase or frequency relationship required. Internal arbitration logic resolves simultaneous accesses, and BUSYL/BUSYR flags indicate contention without stalling either clock domain.

How does the mailbox interrupt mechanism work without CPU polling?

The mailbox uses the top two memory locations (3FFFF for right port, 3FFFE for left port). A write to the opposite port's mailbox address asserts INTL or INTR LOW. That flag remains asserted until the owning port performs a read from its own mailbox address - automatically clearing the flag on data capture, enabling event-driven response without periodic status checks.

Is the MRST pin required to be held active for a specific duration after power-up?

MRST must be held LOW for a minimum of 100 ns after VDDIO reaches 3.0V, then released HIGH. This asynchronous reset initializes both burst counters to zero, mask registers to all-ones, and interrupt flags to HIGH. Failure to apply MRST post-power-up results in undefined counter and interrupt states, risking mailbox or counter malfunction.