
User’s Manual U14579EJ2V0UM
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CHAPTER 1 OVERVIEW
This chapter presents an overview of the VRC4173.
1.1
Features
The VRC4173 is a companion chip that is to be connected to a product having a PCI bus in the VR4100 Series such
as NEC’s 64-bit RISC processor VR4122.
The VRC4173 incorporates the I/O macros necessary for a handheld PC running Windows CE, and can also
access design resources on a personal computer by means of the PCI bus interface.
The VRC4173 has the following features.
Processor interface
PCI bus: Compliant with PCI Local Bus Specification Revision 2.1
33 MHz operation
CLKRUN signal support
On-chip USB host controller
Compliant with Open HCI Specification Release 1.0
USB ports: 2 ports
Full speed (12 Mbps) and low speed (1.5 Mbps) support
On-chip FIFO: 4 × 4 double word (PCI side), 64 × 1 byte (USB side)
On-chip PC card controller
Compliant with 1997 PC Card standard (excluding 32-bit PC card)
Supports two card slots
Buffer with 5 V withstand voltage
On-chip interface for an external power supply control IC
On-chip AC-Link interface
Compliant with AC97 (Audio Codec ’97) standard Rev 2.1
DMA support
On-chip PS/2 controller
On-chip keyboard controller
96-key support (compatible with KIU of VR4121TM)Note
On-chip audio controller
Playback (10-bit D/A converter), recording (12-bit A/D converter)
Compatible with AIU of VR4121
On-chip touch panel controller
Touch panel driver, coordinate detection (12-bit A/D)
General-purpose analog input: 1 port
Compatible with PIU function of VR4121
GPIO (general-purpose I/O pin)
Supports a total of 21 pins
Compatible with GIU of VR4121
On-chip 48 MHz oscillator
Power supply voltage: 3.3 V (some internals with 5 V withstand voltage)
Note This becomes 64-key support when the PS/2 is used with two channels because of exclusive use relative to
the PS/2.