ETC VRC4172

VR C 4 1 7 2 C O M P A N I O N C H I P
F O R V R4 1 2 1 M I C R O P R O C E S S O R
The VRC4172TM companion chip to NEC’s VR4121TM MIPS® RISC microprocessor is designed for high-end
Windows® CE Handheld PC Professional applications. The VR4121 microprocessor functions as the host
CPU, while the VRC4172 supplies the SDRAM interface, USB interface, host- and peripheral-selectable
IEEE-1284 parallel interface, 16550-compliant serial interface, PS/2 interface, general-purpose I/O ports,
general-purpose chip select signal, and pulse-width modulation for the LCD back light.
In combination, the VR4121 and VRC4172 offer an excellent performance/cost solution for next-generation
Windows CE applications, forming a superior engine for most, if not all, high-performance Windows
CE-based handheld products.
BLOCK DIAGRAM
VRC4172
48 MHz
DRAM
Controller
Internal
PCI Bus
PCI Bus
Controller
SDRAM
SDRAM
USB
Host Controller
(OpenHCI 1.0)
Dual Port
IEEE-1284
Parallel Controller
••••
••••
16550 Serial
Controller 1 and 2
RS-232-C
Dual Port
VR4121
PS/2 Controller
Keyboard/Mouse
System
Bus
Pulse-Width
Modulator Controller
LCD Backlight
Programmable
Chip Select (6-Bit)
General-Purpose
I/O (24-Bit)
98YL-0227C (12/98)
O R D E R I N G I N F O R M AT I O N
PART NUMBER
VRC4172
PACKAGE
256-pin TBGA
F E AT U R E S
PROCESSOR INTERFACE
— 32-bit LCD interface
— 16-bit mini-ISA bus interface (as defined by VR4121)
— DRAM interface and SDRAM controller for
DMA/master mode
USB HOST CONTROLLER
— OpenHCI USB 1.0 compliant
— Standard communication with USB device;
asynchronous communication with host CPU
— Full-speed (12 Mbps) and low-speed (1.5 Mbps)
operation
— 48-MHz system clock
— On-chip FIFO
– PCI read: 4 x 4 Dword
– PCI write: 4 x 4 Dword
– USB side: 64 x 1byte
— Two downstream ports
— No support for legacy interface
IEEE1284 PARALLEL PORT INTERFACE
— ECP, EPP, SPP, and P1284 host function with DMA
operation
— Device function operation
SERIAL PORT INTERFACE
— Two 16550-compatible serial interfaces
PROGRAMMABLE CHIP SELECT AND
GENERAL-PURPOSE I/O
— Six chip selects
— 24 general-purpose I/O (GPIO) signals
PS/2 INTERFACE
— PS/2 keyboard and mouse support
PULSE-WIDTH MODULATION (PWM) FOR
LCD BACKLIGHT
PACKAGE
— 256-pin TBGA (27 mm square)
S A M P L E W I N D O W S C E H / P C P R O F E S S I O N A L I M P L E M E N TAT I O N
Graphic Chip Vender
RAM
ROM
Frame
Buffer
DAA
LCD Panel
VR4121
Soft Modem
131 MHz
CODEC
168 MHz
LCD Controller
with Accelerator
VGA Output
RAMDAC
Up to 1024 x 768
PC Card
Controller
Fast IR
CRT
PC Card
CompactFlash
VRC4172
USB (Host)
Two Serial
Interfaces
One Parallel
Interface
PS/2 Keyboard
PS/2 Mouse
Pulse-Width
Modulator
Touch Panel
Serial Connections
PS/2 Mouse
USB Devices
98YL-0228C (12/98)
For literature, call 1-800-366-9782 7 a.m. to 6 p.m. Pacific time
or fax your request to 1-800-729-9288
or visit our Web site at www.necel.com
© April 1999 NEC Electronics Inc. NEC, VR Series, VRC4121, VR4172 are either trademarks or registered trademarks of NEC Corporation in the United States and/or other countries. Windows and Windows CE are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. All other trademarks are the property of their respective owners. No part of this document may be copied or reproduced in any form or by any means
without the prior written consent of NEC Electronics Inc. (NECEL). The information in this document is subject to change without notice. ALL DEVICES SOLD BY NECEL ARE COVERED BY THE PROVISIONS APPEARING IN NECEL TERMS
AND CONDITIONS OF SALES ONLY, INCLUDING THE LIMITATION OF LIABILITY, WARRANTY, AND PATENT PROVISIONS. NECEL makes no warranty, express, statutory, implied, or by description, regarding information set forth herein or
regarding the freedom of the described devices from patent infringement. NECEL assumes no responsibility for any errors that may appear in this document. NECEL makes no commitments to update or to keep current information contained in
this document. The devices listed in this document are not suitable for use in applications such as, but not limited to, aircraft control systems, aerospace equipment, submarine cables, nuclear reactor control systems, and life-support systems.
“Standard” quality grade devices are recommended for computers, office equipment, communication equipment, test and measurement equipment, machine tools, industrial robots, audio and visual equipment, and other consumer products. For
automotive and transportation equipment, traffic control systems, and anti-disaster and anti-crime systems, it is recommended that the customer contact the responsible NECEL salesperson to determine the reliability requirements for any such
application and any cost adder. NECEL does not recommend or approve use of any of its products in life-support devices or systems or in any application where failure could result in injury or death. If customers wish to use NECEL devices in applications not intended by NECEL, customers must contact the responsible NECEL salespeople to determine NECEL’s willingness to support a given application.
Document # U14034EU2V0PB00