NEC uPD72257, Preliminary User'S Manual

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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
Feature Ravin-L Ravin-M
Typical display size QVGA/HVGA VGA
External Memory Controller SDRAM, SRAM, NOR flash SDRAM, SRAM, NOR flash
External Memory I/F width 16-bit data bus 32-bit data bus
Internal RAM 160 KB –
Host CPU I/F 8-bit LBus 8-bit LBus / 16-bit ADBus
BitBLT √ √
Vector Drawing Engine √ √
Video Input I/F – √
Digital Video Output I/F one two
Virtual layering √ √
Alpha blending √ √
Anti aliasing Vector and bitmaps Vector and bitmaps
System frequency 40 MHz 80 MHz
Supply voltage
Core supply 1.5 V 1.5 V
I/O supply 3.3 V 3.3 V
Package 176 pin QFP 176 pin QFP
√: available; –: not available
Preliminary User's Manual S19203EE1V3UM00
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