Cypress Semiconductor Corp CY7C0831AV-167AXC

Overview

CY7C0831AV-167AXC from Cypress Semiconductor is a 3.3V synchronous true dual-port SRAM with 128K × 18-bit (2 Mbit) density, pipelined clock-to-data access of 4.0 ns, and support for simultaneous independent read/write operations on left and right ports. It features burst address counters, mailbox interrupt logic for inter-port messaging, and IEEE 1149.1 JTAG boundary scan-used in high-speed FPGA co-processing, real-time DSP buffering, and industrial motion controller data exchange.

For engineers reviewing the CY7C0831AV-167AXC datasheet, CY7C0831AV-167AXC pinout, CY7C0831AV-167AXC application, or CY7C0831AV-167AXC equivalent, key selection criteria include 17-bit address width (A0L–A16L / A0R–A16R), dual chip enables per port (CE0L/CE1L & CE0R/CE1R), counter-interrupt flag (CNTINTL/CNTINTR), and 144-ball FBGA or 120-pin TQFP package compatibility.

Technical Context

This device implements two fully independent synchronous ports sharing a single 128K × 18-bit RAM array, with pipelined register stages on all control, address, and data lines to minimize setup/hold timing. Each port includes a programmable 17-bit burst address counter with mask register, counter reset (CNTRST), and counter-enable (CNTEN) logic synchronized to its dedicated clock (CLKL/CLKR).

The mailbox function uses the top two memory locations (1FFFEh and 1FFFFh) for inter-port message passing, with INTL/INTR flags asserted asynchronously on write and cleared on read. JTAG boundary scan (TCK/TMS/TDI/TDO) operates independently of memory access and supports IEEE 1149.1 compliance without affecting real-time operation.

Key Specifications

Pinout & Package

Available in 144-ball FBGA (13 mm × 13 mm) and 120-pin TQFP (14 mm × 14 mm × 1.4 mm) packages. Pin functions are symmetric across left/right ports with dedicated control, address, data, and interrupt signals per side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C0832AV-167AXC and IDT70V27L15PF, the CY7C0831AV-167AXC delivers optimal balance of depth, speed, and integrated features-its 17-bit addressing fits compact layouts, while mailbox and counter logic reduce firmware overhead in real-time systems.

Availability

CY7C0831AV-167AXC is available at Aetrix Electronics and suitable for industrial motion controllers, FPGA co-processing buffers, DSP algorithm accelerators, and real-time protocol gateways requiring stable component supply across extended product lifecycles.

Supply support for CY7C0831AV-167AXC 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) designs high-performance memory and programmable solutions for industrial, automotive, and communications systems.

The FLEx18™ family targets deterministic real-time data exchange-specifically engineered for FPGA/DSP co-processing, motion control buffering, and protocol bridging where simultaneous dual-port access and hardware-assisted messaging are critical.

FAQ

What is the maximum supported clock frequency and corresponding cycle time?

The CY7C0831AV-167AXC supports up to 167 MHz clock frequency, enabling a 6 ns minimum cycle time in pipelined mode. This is verified by the 4.0 ns clock-to-data access specification and confirmed in Table 1 of the official datasheet (Doc #38-06059 Rev. *S). The device meets this timing under industrial temperature conditions with 3.3V ±5% supply.

How does the mailbox interrupt mechanism work between left and right ports?

The mailbox uses memory addresses 1FFFEh (left port mailbox) and 1FFFFh (right port mailbox). When the right port writes to 1FFFEh, INTL asserts LOW; when the left port writes to 1FFFFh, INTR asserts LOW. Reading the respective mailbox location clears the flag. Both operations occur synchronously with the writing/reading port's clock edge and require at least one byte enable active.

Can the burst address counter be configured for non-power-of-two wrap sizes?

Yes-the counter mask register (accessed via CNT/MSKL/R) allows arbitrary wrap boundaries. For example, setting mask bits to 0b111111111111111100 (14 ones, 2 zeros) configures a 4K-word wrap range. The unmasked LSBs increment normally; masked MSBs remain fixed. This is documented in "Address Counter and Mask Register Operations" (page 6) and validated in CY7C0831AV-specific pin definitions.

Is JTAG boundary scan functional during normal memory operation?

Yes-JTAG (TMS/TCK/TDI/TDO) operates independently of memory access, clock, or reset states. It remains fully functional during active read/write cycles, allowing in-system test and debug without halting real-time operation. This is explicitly stated in the Functional Description section and confirmed by IEEE 1149.1 compliance testing in the datasheet.