Texas Instruments PCI2040GGU

Overview

The PCI2040GGU from Texas Instruments is a PCI-DSP bridge controller enabling glueless interfacing between the PCI Local Bus and TI TMS320C54x (8-bit HPI) or C6x (16-bit HPI) DSPs. It operates as a PCI target-only device at up to 33 MHz, supports up to four DSPs via dedicated HPI control logic, features 3.3-V core logic with universal 3.3-V/5-V tolerant I/Os, and integrates serial ROM loading for subsystem ID configuration.

For engineers reviewing the PCI2040GGU datasheet, PCI2040GGU pinout, PCI2040GGU application, or PCI2040GGU equivalent, this page delivers verified functional architecture, confirmed HPI-to-PCI transaction mapping, validated GPIO and general-purpose bus interface capabilities, and precise package-level terminal assignments for LQFP-144 (GGU) implementation.

Technical Context

The PCI2040GGU implements a fixed-function PCI target interface compliant with PCI Local Bus Specification Rev 2.2 and Power Management Interface Spec Rev 1.1. Its internal architecture includes dedicated HPI CSR register space, programmable chip select decoding for up to four DSPs, and hardware-managed HPI memory mapping with auto-increment support for C54x and software handshaking (HRDY/FETCH) for C6x.

It provides three independent external buses: PCI (32-bit multiplexed AD[31:0], C/BE[3:0], FRAME, IRDY, TRDY), HPI (16-bit data, HCNTL, HDS, HR/W, HRDY), and GPB (16-bit general-purpose bus supporting TI JTAG TBC). All interfaces are synchronized to PCI_PCLK (max 33 MHz) with no internal PLL or clock generation.

Key Specifications

Pinout & Package

PCI2040GGU is housed in a 144-pin Low-Profile Quad Flat Package (LQFP) with 0.5-mm pitch, designated GGU per TI ordering nomenclature. Pin assignments follow JEDEC MS-026AC and are fully documented in Figure 2–1 and Tables 2–1/2–2 of SCPS048.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-DSP bridge applications.

Compared with PCI2040PGE, the PCI2040GGU offers identical functionality in an LQFP package optimized for manual inspection and lower-cost assembly; compared with TMS320C6416T-500, it preserves legacy HPI-based DSP firmware and enables scalable multi-DSP topologies without architectural redesign.

Availability

PCI2040GGU is available at Aetrix Electronics and suitable for telecom line card processing, industrial motor control DSP gateways, medical imaging signal processing, and test equipment DSP subsystems requiring stable component supply and long-term obsolescence management.

Supply support for PCI2040GGU 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with over 50 years of leadership in DSP innovation and industrial-grade interface solutions.

The PCI2040GGU belongs to TI's PCI Bus Solutions product line, designed specifically to simplify high-speed interconnection between PCI hosts and TI's TMS320 DSP families - targeting telecom infrastructure, industrial automation, and medical imaging systems.

FAQ

What is the primary function of the PCI2040GGU in a system architecture?

The PCI2040GGU serves as a dedicated PCI-to-DSP bridge, enabling direct, glueless communication between a PCI host and TI TMS320C54x or C6x DSPs via their Host Port Interface (HPI). It functions exclusively as a PCI target device - handling memory-mapped reads and writes from the PCI bus and translating them into HPI transactions without requiring external logic or FPGA intervention. This makes PCI2040GGU ideal for accelerating signal processing tasks in PCI-based systems while preserving DSP firmware integrity.

Does the PCI2040GGU support both 3.3-V and 5-V PCI environments?

Yes, the PCI2040GGU supports universal PCI signaling through its VCCP supply pin, which accepts either 3.3 V or 5 V to configure the PCI I/O voltage level. This dual-voltage capability ensures compatibility with both modern 3.3-V PCI slots and legacy 5-V implementations. The device's PCI interface complies fully with PCI Local Bus Specification Rev 2.2 under either condition, and no configuration register setting is required - voltage detection is hardware-based and automatic.

Can the PCI2040GGU interface with more than one DSP simultaneously?

Yes, the PCI2040GGU supports up to four DSPs via dedicated HPI chip select signals (HCS0–HCS3) and independent HRDY inputs (HRDY5x0/HRDY6x0 through HRDY5x3/HRDY6x3). Each DSP connects to the shared HPI data/address bus (HAD[15:0]) but is selected individually, allowing the host to perform concurrent or sequential memory-mapped operations across multiple DSPs. This capability is implemented in hardware and requires no additional arbitration logic.

What role does the serial ROM interface play in PCI2040GGU initialization?

The serial ROM interface on the PCI2040GGU loads critical configuration data during power-up, specifically the Subsystem Vendor ID and Subsystem ID registers. This eliminates the need for external parallel PROM or host-driven register initialization, enabling autonomous boot behavior. The ROM data format is defined in Figure 3–2 of SCPS048, and the interface uses standard SPI-like timing - allowing use of low-cost 32-bit serial EEPROMs to store board-specific identification information.

Is the PCI2040GGU compatible with CompactPCI hot-swap systems?

Yes, the PCI2040GGU includes native CompactPCI hot-swap support per PICMG 2.1 Rev 1.0, implemented via dedicated pins (HSLED, HSSWITCH) and the CPCI Hot Swap Control and Status Register (address 4–20). It monitors insertion/removal events, controls LED indicators, and coordinates safe power sequencing - all without requiring external hot-swap controllers. This makes PCI2040GGU suitable for carrier-grade telecom and industrial backplane applications demanding field-replaceable module capability.