PCI2050 datasheet(25/81 Pages) TI

25 / 81 page

3–1

3 Feature/Protocol Descriptions

The following sections give an overview of the PCI2050 PCI-to-PCI bridge features and functionality. Figure 3–1

shows a simplified block diagram of a typical system implementation using the PCI2050.

PCI Option Card

CPU

Memory

Host

Bridge

PCI2050

PCI

Device

PCI

Device

PCI Bus 0

PCI Bus 1

Host Bus

PCI Option Slot

PCI2050

PCI

Device

PCI

Device

PCI Bus 2

(Option)

PCI Option Card

Figure 3–1. System Block Diagram

3.1

Introduction to the PCI2050

The PCI2050 is a bridge between two PCI buses and is compliant with both the

PCI Local Bus Specification and the

PCI-to-PCI Bridge Specification. The bridge supports two 32-bit PCI buses operating at a maximum of 33 MHz. The

primary and secondary buses operate independently in either a 3.3-V or 5-V signaling environment. The core logic

of the bridge, however, is powered at 3.3 V to reduce power consumption.

Host software interacts with the bridge through internal registers. These internal registers provide the standard PCI

status and control for both the primary and secondary buses. Many vendor-specific features that exist in the TI

extension register set are included in the bridge. The PCI configuration header of the bridge is only accessible from

the primary PCI interface.

The bridge provides internal arbitration for the nine possible secondary bus masters, and provides each with a

dedicated active low request/grant pair (REQ/GNT). The arbiter features a two-tier rotational scheme with the

PCI2050 bridge defaulting to the highest priority tier.

Upon system power up, power-on self-test (POST) software configures the bridge according to the devices that exist

on subordinate buses, and enables performance-enhancing features of the PCI2050. In a typical system, this is the

only communication with the bridge internal register set.

PCI2050 bảng dữ liệu(PDF) 25 Page - Texas Instruments

PCI2050 bảng dữ liệu(HTML) 25 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

bảng dữ liệu tải về

Link URL