V
R C
4 1 7 2 C O M P A N I O N C H I P
F O R V
R
4 1 2 1 M I C R O P R O C E S S O R
The V
RC
4172
TM
companion chip to NEC鈥檚 V
R
4121
TM
MIPS
廬
RISC microprocessor is designed for high-end
Windows
廬
CE Handheld PC Professional applications. The V
R
4121 microprocessor functions as the host
CPU, while the V
RC
4172 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 V
R
4121 and V
RC
4172 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
V
RC
4172
48 MHz
DRAM
Controller
PCI Bus
Controller
Internal
PCI Bus
USB
Host Controller
(OpenHCI 1.0)
Dual Port
SDRAM
SDRAM
IEEE-1284
Parallel Controller
鈥⑩€⑩€⑩€?/div>
鈥⑩€⑩€⑩€?/div>
16550 Serial
Controller 1 and 2
RS-232-C
Dual Port
V
R
4121
System
Bus
PS/2 Controller
Keyboard/Mouse
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
V
RC
4172
PACKAGE
256-pin TBGA
1
2
