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VR Series Microprocessors
NEC Electronics Inc.
VR4181 Block Diagram
EDO/
SDRAM
ROM/
Flash
Compact
Flash
STN LCD Panel
up to 320 x 320
Color/Monochrome
RAM
Control
ROM
Control
Bus
Control
DSU
DMA
Interrupt
Control
CF
Control
LCD
Controller
USB
Control
USB Interface
32.768k
18.432M
Clock
Generator
VR4110
CPU Core
84 MHz
CPU I/F
Bridge
Power
Management
PCM
Audio
D/A
PCM Sound
Audio in
Key Scan
I/F
RTC/
Timer
LED GPIO Serial 1 Serial 2 CSI
Touch
Panel
Control
A/D
Touch Panel
8x8 Key Matrix
LED
Port
Control
Ir LED/232CDrv
PC Communicate
Cellular
Block
Antenna
Battery Monitor
Features
VR4110 CPU Core
• MIPS I, II, and III ISA compliant
• MIPS 16 ASE compliant for compact code density
• Five-stage pipeline running at up to 66 MHz (87
Dhrystone MIPS)
• Single-cycle 32-bit MAC instruction for DSP operations
Memory Management Unit
• 32-bit physical addressing range of 4 GB with 40-bit
virtual address space
• 32 double-entry TLBs supporting 1~256 KB page size
• Up to 64 MB of SDRAM/EDO/fast-page DRAM and
64 MB of SROM/flash memory/mask ROM
• Up to 66 MHz operation
Cache Memory Unit
• 4 KB direct-mapped instruction cache
• 4 KB direct-mapped data cache
Bus Control Unit
• Ultra-power-saving Modular Bus Architecture (MBA)
• Supports 32-bit and 16-bit addressing modes
• Dynamic bus sizing supports a subset of the ISA bus
Power Management Unit
• Supports four power-saving modes: Fullspeed, Standby,
Suspend, and Hibernate
Clock Generator Unit
• Built-in PLL for frequency multiplication
• External bus frequency of 16 and 33 MHz
Real-time Clock with Four Built-in Timers
Interrupt Control Unit
• Supports both internal and external interrupts
DMA Address Unit and DMA Control Unit
• Controls five different DMA channels
General-Purpose I/O Unit
• Controls 49 GPIO pins
Keyboard (64-key), Touch-panel, and LED Interface
10-bit A/D Converter for Touch-panel and Audio Input
Two Serial Interface Unit (16550 compliant)
• Supports up to 115 kbps
• RS-232-C compliant
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