VR4102 datasheet(29/701 Pages) NEC

29 / 701 page

CHAPTER 1 INTRODUCTION

This chapter describes the outline of the VR4102 (

µPD30102), which is a 64-/32-bit RISC microprocessor.

1.1 FEATURES

The VR4102, which is a high-performance 64-/32-bit microprocessor employing the RISC (reduced instruction set

computer) architecture developed by MIPS, is one of the RISC microprocessor VR-SeriesTM products manufactured

by NEC.

The VR4102 is ideally suited for battery-driven high-performance portable information equipment.

It mainly consists of the high-performance ultra-low-power consumption VR4102 CPU core, and has various

peripheral functions including a DMA controller, software modem interface, serial interface, keyboard interface, IrDA

interface, touch panel interface, real-time clock, A/D converter, and D/A converter.

The external bus width of this device can be selected between 32 bits and 16 bits. This function enables the

VR4102 to process voluminous data at high speed.

The features of the VR4102 are described below.

a Employs 64-bit RISC CPU Core (VR4100 equivalent)

a Internal 64-bit processing

a Optimized 5-stage pipeline

a Conforms to MIPS I, II, III instruction sets (with the FPU, LL, and SC instructions left out)

a Supports high-speed product-sum operation instructions to execute applications in high speed

a On-chip 4-Kbyte instruction cache and 1-Kbyte data cache

a 32-double-entry translation lookaside buffer (TLB) for virtual address management

a 32-bit physical address space and 40-bit virtual address space (in 64-bit mode)

a On-chip peripheral units suited for portable equipment

• Memory controller (supports ROM, EDO-type DRAM, and flash memory)

• ISA-bus interface

• Keyboard interface

• Touch panel interface (on-chip 4-channel A/D converter)

• Controller complying with IrDA 1.1 (FIR)

• Software modem interface

• DMA controller

• Serial interface

• Debug serial interfaces

• Interrupt controller

• Audio interface (on-chip digital I/O, A/D and D/A converters)

• General-purpose A/D converter: 3 channels

• General-purpose ports

a Effective power management features, which include the following four operating modes:

• Fullspeed mode: normal operating mode in which all clocks operate

• Standby mode: all internal clocks stop except for interrupt-related clocks

• Suspend mode: bus clock and all internal clocks stop except for interrupt-related clocks

• Hibernate mode: all clocks generated by the CPU core stop

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