sed1355 ETC-unknow, sed1355 Datasheet - Page 360

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 8
2 Features
2.1 SED1355 Embedded RAMDAC LCD/CRT Controller
2.1.1 Display Buffer
SDU1355-D9000
X23A-G-002-03
• SED1355 Embedded RAMDAC LCD/CRT controller.
• On-board 2M byte EDO-DRAM display buffer.
• On-board adjustable LCD bias voltage power supply.
• SmallTypeZ x 2 form factor (requires two side-by-side SmallTypeZ slots).
The SED1355 is a low cost, low power, color/monochrome LCD/CRT controller with an embedded
RAMDAC capable of interfacing to a wide range of CPUs and LCD displays.
The SED1355 supports LCD interfaces with data widths up to 16-bits. Using Frame Rate
Modulation (FRM), it can display 16 shades of gray on monochrome panels, up to 4096 colors on
passive panels and 64K colors on active matrix TFT/D-TFD. CRT support is handled through the
use of an embedded RAMDAC allowing simultaneous display of both the CRT and LCD displays.
In this design, the SED1355 has a 3.3V supply voltage for both logic and the embedded RAMDAC.
For complete details on register functionality and programming, refer to the SED1355 Hardware
Functional Specification, document number X23A-A-001-xx, and the SED1355 Programming
Notes and Examples, document number X23A-G-003-xx.
The SED1355 supports a 512K byte or 2M byte FPM-DRAM or EDO-DRAM display buffer. On
the SDU1355-D9000 evaluation board a 1Mx16 EDO-DRAM (2M byte) is used to provide memory
for all supported display resolutions, and when smaller display sizes are used, to provide multiple
“pages” of memory.
• 4/8-bit monochrome or 4/8/16-bit color LCD interface for single-panel, single-drive displays.
• 8-bit monochrome or 8/16-bit color LCD interface for dual-panel, dual-drive displays.
• Direct support for 9/12-bit TFT/D-TFD; 18-bit TFT/D-TFD is supported to 64K colors (16-bit
• Direct CRT support to 64K colors using the SED1355 embedded RAMDAC.
• Up to 16 shades of gray using Frame Rate Modulation (FRM) on monochrome passive LCD
• Up to 4096 colors on color passive LCD panels; three 256x4 Look-Up Tables (LUT) are used
• Up to 64K colors on TFT/D-TFD and CRT; three 256x4 Look-Up Tables are used to map
data).
panels.
to map 1/2/4/8 bpp modes into these colors, 15/16 bpp modes are mapped directly using the
four most significant bits of the red, green and blue colors.
1/2/4/8 bpp modes into 4096 colors, 15/16 bpp modes are mapped directly.
Epson Research and Development
Evaluation Board User Manual
Vancouver Design Center
Issue Date: 98/10/30