It’s possible that a “RISC to PCI Companion Chip” refers to a chip that acts as an interface between a RISC-based processor and the PCI bus. Such a chip would facilitate communication between the RISC processor and the PCI bus, allowing the RISC-based system to connect with and control PCI devices.
These companion chips may handle tasks such as address decoding, bus arbitration, and data transfer between the RISC processor and the PCI bus. They can provide the necessary protocol conversion and logic to bridge the communication gap between the RISC architecture and the PCI bus.
Part Number: IT8152G
Function: RISC to PCI Companion Chip
Package: 208-pin PQFP and 208-pin LBGA Type
Manufacturer: Integrated Technology Express
Images:
Description
The IT8152G, an advanced RISC-to-PCI companion chip that supports SA1110 32-bit RISC microprocessor interface, is especially designed for the main applications in Datacomm, Telecomm, and Internet Appliances and Networking devices. This companion chip interfaces directly to RISC processors, and provides a bridge to link host bus and PCI bus. It also provides a Shared Memory (SDRAM) Controller, Low Pin Count (LPC) Host Controller, Interrupt Controller, DMA Controller, Timers, USB Host Controller, Digital AC97 Controller, GPIO ’Controller and Power Management.
Paired with Intels SA1110 ’ RISC microprocessor interface, the IT8152 provides a low cost, high performance host to PCI bridge function for any system applications in Datacomm/Telecomm products. […]
Features:
1. PCI Bus Controller
− 32-bit data bus interface
− Supports PCI rev. 2.1 specification
− Provides CPU to PCI buffers for burst transfer
− PCI bus arbiter built in
− Supports up to 4 individual external bus master devices
− Supports CLKRUN# signal function
− 33 MHz bus operation
2. Interrupt Controller
− Supports one maskable interrupt to RISC processor
− Interrupt order is controlled by software
− Registers support interrupts masking and unmasking
3. Chaining DMA Controller
− Four independent software DMA channels
− Supports chaining mode and non-chaining mode
− Supports both PCI memory address and I/O address
− Supports rotating and fixed priority types
− Supports DMA transfers of unaligned address