sed1355 ETC-unknow, sed1355 Datasheet - Page 488

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

Page 14
4.4 Memory Mapping and Aliasing
SED1355
X23A-G-011-03
The NEC V
controller. The physical address range from 0A00 0000h to 0AFF FFFFh (16M bytes) is
reserved for use by an external LCD controller (e.g. SED1355).
The SED1355 supports up to 2M bytes of display buffer. The NEC V
ADD21 (connected to M/R#) is used to select between the SED1355 display buffer
(ADD21=1) and the SED1355 internal registers (ADD21=0). NEC V
ADD[23:22] are ignored, thus the SED1355 is aliased four times at 4M byte intervals over
the LCD controller address range. Address lines ADD[25:24] are set at 10b and never
change while the LCD controller is being addressed.
R
4121 provides the internal address decoding required by an external LCD
Interfacing to the NEC VR4121™ Microprocessor
Epson Research and Development
Vancouver Design Center
R
R
4121 address lines
4121 address line
Issue Date: 99/05/05