Cg Ram - Xilinx Spartan-3A User Manual

R
The character ROM contains the ASCII English character set and Japanese katakana
characters.
The controller also provides for eight custom character bitmaps, stored in
eight custom characters are displayed by storing character codes 0x00 through 0x07 in a
DD RAM

CG RAM

The Character Generator RAM (CG RAM) provides space to create eight custom character
bitmaps. Each custom character location consists of a 5-dot by 8-line bitmap, as shown in
Figure
The
writing to CG RAM. Write CG RAM data using the
command, and read CG RAM using the
Spartan-3A/3AN Starter Kit Board User Guide
UG334 (v1.0) May 28, 2007
DB7
DB6
DB5
DB4
Figure 5-4: LCD Character Set
location.
5-5.
Set CG RAM Address command initializes the address counter before reading or
www.xilinx.com
Upper Data Nibble
UG230_c5_02_030306
Write Data to CG RAM or DD RAM
Read Data from CG RAM or DD RAM
LCD Controller
CG RAM. These
command.
47