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VR Series Microprocessors
NEC Electronics Inc.
VR4121 Block Diagram
Software Modem
Codec
DAA
LCD
Controller
PC
Card
ROM/
Flash
Osc
Osc
Phase
Locked Loop
VR4120 CPU
(131, 168 MHz)
16 KB Instruction Cache
8 KB Data Cache
Host Signal
Processing Unit
Real-Time
Clock
Direct Memory
Access Unit
Deadman's
Switch Unit
Interrupt
Control Unit
Power
Mgmt Unit
D/A
Converter
Audio
Interface Unit
General-Purpose
I/O Unit
Keyboard
Interface
LED
Interface
Touch-Panel
Interface
Touch
Panel
SDRAM/
EDO DRAM
Bus Control Unit
VR4121
Cache
Memory Unit
A/D
Converter
16550
Serial Interface
Fast Infrared
Controller
Fast Infrared
Driver
MIC
RS232C
Driver
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
Cache Memory Unit
• 16 KB direct-mapped instruction cache
• 8 KB direct-mapped data cache
Bus Control Unit
• 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 16/33 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 (96-key), Touch Panel, and LED Interface
10-bit A/D Converter for Touch-panel and Audio Input
Serial Interface Unit (16550 compliant)
• Supports up to 115 kbps
• Separate debugging serial port
Fast IR Unit
• Performs 0.5 to 4 Mbps IrDA 1.1 standard communication
Audio Interface Unit and 10-bit D/A Converter
• Supports audio output and microphone input sampling
Host Signal Processing Unit
• Supports data and fax software modem capabilities
AC/DC Specifications
• 168 MHz maximum frequency
• 2.5 V core and 3.3 V I/O operating voltage
• 385 mW power consumption (typical)
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