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User’s Manual U14272EJ3V0UM
29
CHAPTER 1 INTRODUCTION
This chapter describes the outline of the V
R
4181 (
μ
PD30181), which is a 64-/32-bit microprocessor.
1.1 Features
The V
R
4181, which is a high-performance 64-/32-bit microprocessor employing the RISC (reduced instruction set
computer) architecture developed by MIPS
Electronics.
The V
R
4181 contains the V
R
4110
product-sum operation unit, and memory management unit. It also has interface units for peripheral circuits such as
LCD controller, CompactFlash controller, DMA controller, keyboard interface, serial interface, IrDA interface, touch
panel interface, real-time clock, A/D converter and D/A converter required for the battery-driven portable information
equipment. The features of the V
R
4181 are described below.
TM
, is one of the V
R
-Series microprocessor products manufactured by NEC
TM
CPU core of ultra-low-power consumption with cache memory, high-speed
Employs 0.25
μ
m process
64-bit RISC V
R
4110 CPU core with pipeline clock up to 66 MHz (operation in 32-bit mode is available)
Optimized 5-stage pipeline
On-chip instruction and data caches with 4 KB each in size
Write-back cache for reducing store operation that use the system bus
32-bit physical address space and 40-bit virtual address space, and 32 double-entry TLB
Instruction set: MIPS III (with the FPU, LL and SC instructions left out) and MIPS16
Supports MADD16 and DMADD16 instructions for executing a multiply-and-accumulate operation of 16-bit data
x 16-bit data + 64-bit data within one clock cycle
Effective power management features, which include four operating modes, Fullspeed, Standby, Suspend and
Hibernate mode
On-chip PLL and clock generator
DRAM interface supporting 16-bit width SDRAM and EDO DRAM
Ordinary ROM/PageROM/flash memory interface
UMA based LCD controller
4-channel DMA controller
RTC unit including 3-channel timers and counters
Two UART-compatible serial interfaces and one clocked serial interface
IrDA (SIR) interface
Keyboard scan interface supporting 8 x 8 key matrix
X-Y auto-scan touch panel interface
CompactFlash interface compatible with ExCA
A/D and D/A converters
Includes ISA-subset bus
Supply voltage: 2.5 V for CPU core, 3.3 V for I/O
Package: 160-pin LQFP