Chapter 1 Introduction - NEC µPD72257 Preliminary User's Manual

Chapter 1 Introduction

Ravin-L (µPD72256) and Ravin-M (µPD72257) are new members of NEC's low-
cost graphics controller series, used to interface coloured TFT displays in
embedded applications like automotive dashboard- or audio applications.
Both products are focusing on cost optimization and flexibility. They are designed
featuring a high compatibility between each other and are future save as they can
be integrated into new SOC designs without changes.
Ravin-L and Ravin-M use the same design base and therefore both products only
differ in parts of the feature set. All common features have the same technical
realization behind.
Note Throughout this document the name Ravin-L is used for the µPD72256 and
Ravin-M for the µPD72257 device.
The graphics controllers provide following features:
Table 1-1 Ravin-L and Ravin-M features
√: available; –: not available
Feature
Typical display size
External Memory Controller
External Memory I/F width
Internal RAM
Host CPU I/F
BitBLT
Vector Drawing Engine
Video Input I/F
Digital Video Output I/F
Virtual layering
Alpha blending
Anti aliasing
System frequency
Core supply
Supply voltage
I/O supply
Package
Preliminary User's Manual S19203EE1V3UM00
Ravin-L
QVGA/HVGA
SDRAM, SRAM, NOR flash SDRAM, SRAM, NOR flash
16-bit data bus
160 KB
8-bit LBus
√
√
–
one
√
√
Vector and bitmaps
40 MHz
1.5 V
3.3 V
176 pin QFP
Ravin-M
VGA
32-bit data bus
–
8-bit LBus / 16-bit ADBus
√
√
√
two
√
√
Vector and bitmaps
80 MHz
1.5 V
3.3 V
176 pin QFP
11