ARM AMBA NIC-301 Specifikace stáhnout pdf (Strana 156)

HDLCD controller

ID062813 Non-Confidential

B.1 Introduction

This appendix describes the LCD controller supporting High Definition (HD) resolutions.

The HDLCD controller has the following features:

• Resolution of 2048×2048, sufficient for full 1080p HDTV resolution.

• Frame buffer:

— Supports all common non-indexed RGB formats.

— Frame buffer can be placed anywhere in memory.

— Scan lines must be a multiple of 8 bytes long, and aligned to 8-byte boundaries.

There are no other restrictions on size or placement. Line pitch is configurable in

multiples of 8 bytes.

• Management:

— Frame buffer address can be updated at any time, and applies from the next full

frame.

— Frame buffer size, color depth, and timing can only be changed while the display is

disabled.

• Maskable interrupts:

— DMA-end, last part of frame read from bus.

—VSYNC.

— Underrun.

—Bus error.

• Color depths:

— Supports 8 bits per color. Frame buffers with other color depths are truncated or

interpolated to 8 bits per component.

• Interfaces:

— AMBA 3 APB interface for configuration.

— Read-only AXI bus for frame buffer reads.

— Standard LCD external interface. All timings and polarities are configurable.

— APB, AXI, and pixel clock can run on separate asynchronous clocks.

• Buffering:

— Internal 2KB buffer.

— After underrun, it blanks the rest of the frame and resynchronizes from the next

frame.

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ARM AMBA NIC-301 Specifikace Strana 156