
MOS INTEGRATED CIRCUIT
PD31172
VRC4172
TM
COMPANION CHIP FOR VR4121
TM
Document No. U14388EJ2V0DSJ1 (2nd edition)
Date Published August 2000 N CP(K)
Printed in Japan
DATA SHEET
The mark
shows major revised points.
DESCRIPTION
The
PD31172 (commercial name: VRC4172) is a companion chip designed for NEC’s PD30121 microprocessor
(commercial name: VR4121).
The VRC4172 has the following functions available on chip: a USB host controller, an IEEE1284 parallel controller,
a 16550 serial controller, a PS/2 controller, general-purpose ports (GPIO), programmable chip select (PCS), and a
PWM controller (a duty modulated light pulse generation function for LCD backlighting).
The VRC4172 can be directly connected to the VR4121, allowing a reduction in the man-hours required for
development of a Windows CE system.
Detailed function descriptions are provided in the following user’s manual.
Be sure to read it before
designing.
VRC4172 User’s Manual (U14386E)
FEATURES
Directly connectable to VR4121
On-chip USB host controller
USB ports: 2
Compliant with the USB OpenHCI specifications, release 1.0
Communicates with USB device asynchronously with host CPU
Full-speed (12 Mbps) and low-speed (1.5 Mbps) modes supported
System clock: 48 MHz
On-chip PS/2 controller
On-chip IEEE1284 parallel controller
On-chip 16550 serial controller
General-purpose ports (GPIO): 24
On-chip PWM controller
Duty modulated light pulse generation function for LCD backlighting
Internal maximum operating frequency: 48 MHz
Power supply voltage: VDD = 3.3 V
± 0.3 V
Package: 208-pin plastic FBGA
APPLICATIONS
Battery-driven portable information devices
Peripheral devices for PCs, etc.
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.