Infineon Technologies CY7C09449PVA-AC

Overview

CY7C09449PVA-AC from Cypress Semiconductor is a 128 Kb dual-port SRAM integrated with a PCI 2.2-compliant bus controller, serving as a bridge between local microprocessors (e.g., QUICC, 80x86, DSP) and the PCI bus. It provides embedded host bridge capability, supports up to 16 KB burst DMA transfers, and includes four 32-entry I2O message FIFOs - enabling interprocess communication in PCI add-in cards and embedded host systems.

For engineers reviewing the CY7C09449PVA-AC datasheet, CY7C09449PVA-AC pinout, CY7C09449PVA-AC application, or CY7C09449PVA-AC equivalent, key selection criteria include its dual-port memory arbitration, PCI master/target transaction handling, I2C-configurable initialization, and direct local bus access without glue logic.

Technical Context

The CY7C09449PVA-AC implements a full PCI 2.2-compliant interface with separate master and target modes, supporting all required PCI commands including memory read/write, I/O cycles, and configuration accesses. Its local bus operates at up to 50 MHz and supports multiplexed/non-multiplexed addressing with programmable polarity on ALE, STROBE, READ/WRITE, and RDY_IN/RDY_OUT.

It integrates an I2O messaging unit using four dedicated FIFOs and shared memory for frame buffers, plus mailbox registers and arbitration flags for software-coordinated resource sharing. The device uses an I2C serial interface to load initialization parameters from external EEPROM post-reset.

Key Specifications

Pinout & Package

Package: 160-pin TQFP (A160), 24 mm × 24 mm body, 0.5 mm pitch, exposed thermal pad (VSSP1–VSSP8).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-to-local-bus bridging applications.

Compared with CY7C09447PVA-AC, the CY7C09449PVA-AC delivers double shared memory for larger message buffers and burst transfers; versus PCI9052, it eliminates external SRAM and arbitration logic but trades configurability for integration.

Availability

CY7C09449PVA-AC is available at Aetrix Electronics and suitable for PCI add-in card development, industrial embedded host systems, telecom line card design, and medical imaging data pipelines requiring stable component supply and long-term lifecycle support.

Supply support for CY7C09449PVA-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) designs high-integration mixed-signal ICs for connectivity, memory, and programmable systems, with legacy leadership in PCI interface solutions.

The CY7C09449PVA-AC belongs to the PCI-DP™ family, engineered specifically to simplify PCI bus integration in embedded systems by combining dual-port memory, I2O messaging, and host bridge functionality in a single chip.

FAQ

Does CY7C09449PVA-AC require external termination resistors on the PCI bus?

No. The CY7C09449PVA-AC complies with PCI 2.2 signal integrity requirements and relies on system-level termination - typically provided by the motherboard or backplane. As a plug-in card component, it does not integrate on-die termination and must be used in systems where PCI bus termination is externally implemented per specification.

Can the local bus interface operate in both multiplexed and non-multiplexed modes?

Yes. The CY7C09449PVA-AC supports both configurations: ADR[14:2] and DQ[14:2] can be used separately for non-multiplexed addressing, or DQ[31:0] can carry multiplexed address/data when ALE is asserted. Polarity of ALE, STROBE, and RDY signals is programmable to match Intel or Motorola timing conventions.

How does the I2C interface affect boot behavior?

The I2C interface (SDA/SCL) enables automatic loading of configuration parameters from an external EEPROM after reset. If no EEPROM is present or ACK is not received, the device boots using default register values - including PCI base address registers, latency timers, and local bus timing defaults - ensuring functional fallback without halting initialization.

Is the 128 Kb dual-port SRAM independently accessible by both buses simultaneously?

Yes - with hardware arbitration. The CY7C09449PVA-AC allows concurrent read/write access from PCI and local bus, using internal arbitration logic to resolve conflicts. Mailbox registers and arbitration flags provide software-controlled synchronization, preventing data corruption during overlapping accesses to shared memory locations.