Overview
The Texas Instruments PCI2250PCMG4 is a high-performance PCI-to-PCI bridge designed to provide a connection path between two peripheral component interconnect (PCI) buses. This component enables transactions between masters on one PCI bus and targets on another, allowing bridged transactions to occur concurrently on both buses. The PCI2250 is compliant with the PCI Local Bus Specification and the PCI-to-PCI Bridge Specification, making it an ideal solution for overcoming electrical loading limits and creating hierarchical buses. It is particularly suited for multifunction compact-PCI cards and adapting single-function cards to hot-swap compliance.
Key Specifications
| Specification | Details |
|---|---|
| PCI Bus Configuration | Two 32-bit, 33-MHz PCI buses |
| Core Logic Voltage | 3.3-V core logic with universal PCI interface compatible with 3.3-V and 5-V PCI signaling environments |
| Arbitration | Internal two-tier arbitration for up to four secondary bus masters; supports external secondary PCI bus arbiter |
| Data Transfer | Burst data transfers with pipeline architecture to maximize data throughput in both directions |
| Buffers | Independent read and write buffers for each direction |
| PCI Clock Outputs | Provides five secondary PCI clock outputs |
| Latency | Predictable latency per PCI Local Bus Specification |
| Bus Locking | Propagates bus locking |
| Reset State | Secondary bus is driven low during reset |
| Decoding Options | Provides VGA palette memory and I/O, and subtractive decoding options |
| Power Management | Compliant with PCI Power Management Interface Specification Revisions 1.0 and 1.1; PCI CLKRUN bridging support |
| Technology | Advanced submicron, low-power CMOS technology |
| Packaging | Packaged in 160-pin QFP (PCM) and 176-pin thin QFP (PGF) |
Key Features
- Configurable for PCI Power Management Interface Specification Revision 1.0 or 1.1 support
- Compact-PCI friendly silicon as defined in the Compact-PCI Hot Swap Specification
- Provides programmable extension windows and port decode options
- Supports burst-mode transfers to maximize data throughput
- Independent read and write buffers for each direction
- Provides decoding of serial and parallel port addresses
- Advanced submicron, low-power CMOS technology for low system power consumption
- Compact-PCI hot-swap extended capability for multifunction compact-PCI cards
Applications
The PCI2250PCMG4 is ideal for various applications, including:
- Creating hierarchical buses to overcome electrical loading limits of 10 devices per PCI bus and one PCI device per expansion slot
- Multifunction compact-PCI cards and adapting single-function cards to hot-swap compliance
- Low-power mobile and docking applications due to PCI CLKRUN bridging support
- Custom PCI applications requiring positive or subtractive decoding on the primary interface
Q & A
- What is the primary function of the PCI2250PCMG4?
The primary function of the PCI2250PCMG4 is to provide a high-performance connection path between two peripheral component interconnect (PCI) buses.
- What are the key specifications of the PCI2250PCMG4?
The key specifications include two 32-bit, 33-MHz PCI buses, 3.3-V core logic, internal two-tier arbitration, burst data transfers, and independent read and write buffers.
- Is the PCI2250PCMG4 compliant with any specific standards?
Yes, it is compliant with the PCI Local Bus Specification, PCI-to-PCI Bridge Specification, and PCI Power Management Interface Specification Revisions 1.0 and 1.1.
- What packaging options are available for the PCI2250PCMG4?
The component is packaged in 160-pin QFP (PCM) and 176-pin thin QFP (PGF).
- Does the PCI2250PCMG4 support hot-swap capabilities?
Yes, it provides compact-PCI hot-swap extended capability as defined in the Compact-PCI Hot Swap Specification.
- How does the PCI2250PCMG4 manage power consumption?
The component uses advanced submicron, low-power CMOS technology to achieve low system power consumption and supports PCI CLKRUN bridging for low-power applications.
- What types of data transfers does the PCI2250PCMG4 support?
The component supports burst data transfers with pipeline architecture to maximize data throughput in both directions.
- Can the PCI2250PCMG4 be used in custom PCI applications?
Yes, it can be configured for positive decoding or subtractive decoding on the primary interface and provides several additional decode options.
- What are some common applications of the PCI2250PCMG4?
Common applications include creating hierarchical buses, multifunction compact-PCI cards, and low-power mobile and docking applications.
- Does the PCI2250PCMG4 support external arbitration?
Yes, it supports an external secondary PCI bus arbiter in addition to its internal two-tier arbitration.
