Infineon Technologies CY7C09449PV-AC

Overview

CY7C09449PV-AC from Cypress Semiconductor is a 128 Kb dual-port SRAM with integrated PCI 2.2 master/target interface and embedded host bridge capability. It provides shared memory between local microprocessors (e.g., QUICC, 80x86, DSP) and the PCI bus, supports up to 16 KB DMA bursts, includes four 32-entry I2O FIFOs, and operates on a single 3.3 V supply compatible with 3 V/5 V PCI signaling.

For engineers reviewing the CY7C09449PV-AC datasheet, CY7C09449PV-AC pinout, CY7C09449PV-AC application, or CY7C09449PV-AC equivalent, key selection criteria include PCI 2.2 compliance, dual-port memory arbitration, local bus configurability (ALE/STROBE/READ/WRITE polarity), I2C auto-configuration support, and interrupt sources including mailbox, FIFO, and DMA completion.

Technical Context

The CY7C09449PV-AC implements a full PCI 2.2-compliant interface with programmable command selection per transaction to optimize prefetch and cache coherency. Its dual-port SRAM allows concurrent access from both PCI and local buses for inter-process communication, while its DMA engine supports burst transfers of up to 16 Kbytes across the full 32-bit PCI address space.

It integrates an I2O message transport unit with four 32-bit FIFOs and dedicated interrupt registers, enabling efficient message pointer exchange via direct local bus access and frame bursting via PCI DMA. The local bus interface is configurable for multiplexed/non-multiplexed modes and supports programmable polarity on ALE, STROBE, READ, WRITE, and BLAST signals.

Key Specifications

Pinout & Package

Package: 160-pin Thin Quad Flat Package (TQFP), 24 mm × 24 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF, CY7C09449PV-AC reduces design complexity by integrating PCI logic and DMA; compared with CY7C09447PV-AC, it doubles shared memory for larger descriptor tables or multi-channel buffering-critical in NICs and imaging systems.

Availability

CY7C09449PV-AC is available at Aetrix Electronics and suitable for industrial control systems, network interface cards, medical imaging subsystems, and telecom ATM edge devices requiring stable component supply and long-term lifecycle support.

Supply support for CY7C09449PV-AC 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 fabless semiconductor company specializing in high-performance mixed-signal and programmable solutions for embedded systems.

The CY7C09449PV-AC belongs to the PCI-DP™ family, designed specifically to simplify PCI integration in embedded applications by combining dual-port memory, PCI interface, DMA, and I2O messaging in a single device.

FAQ

Does CY7C09449PV-AC support PCI 3.0 or PCIe?

No. The CY7C09449PV-AC implements PCI Specification 2.2 only and is not compatible with PCI Express or PCI 3.0 electrical or protocol layers. It operates exclusively on 33 MHz PCI bus timing and uses parallel 32-bit AD/C/BE signaling. Migration to PCIe requires redesign with a PCIe-to-PCI bridge or native PCIe controller.

Can the local bus interface connect directly to an ARM9 processor?

Yes. The local bus supports non-multiplexed mode with programmable polarity on SELECT, ALE, STROBE, READ, and WRITE signals, matching standard ARM9 external memory controller timing. No glue logic is required when configured for 32-bit data width and appropriate wait-state insertion via RDY_IN/RDY_OUT.

What happens if the I2C EEPROM is absent or fails during reset?

The CY7C09449PV-AC boots using internal default values for PCI configuration and local bus settings, allowing basic functionality. All registers remain accessible via PCI configuration space or local bus for runtime reconfiguration. I2C auto-load is optional, not mandatory.

Is the 128 Kb dual-port memory byte-addressable from both buses simultaneously?

Yes. The memory is organized as 16K × 8-bit with full byte-enable support (BE[3:0]) on the local bus and byte-select capability via C/BE[3:0] on the PCI bus. Concurrent reads/writes to different addresses are hazard-free; arbitration logic prevents collisions on same-address access using hardware semaphore flags.