LM1276 National Semiconductor Corporation, LM1276 Datasheet - Page 47

• Manufacturer Part Number: LM1276
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 512 Character Osd Rom, 512 Character Ram And 4 Dacs
• Manufacturer: National Semiconductor Corporation

Attribute Table and Enhanced
Features
Display Window 1 to Display Window 2 Spacing
Please refer to the LM1247 datasheet for details.
Evaluation Character Fonts
The character font for evaluation of the LM1276 is shown in
Figure 19 through Figure 26, where each represents one of
the 8 available ROM banks. Each bank is shown with in-
creasing character address going from upper left to lower
right. The actual font will depend on customer customization
requirements.
Note that the first two character codes of the two-color font in
ROM bank 4 (0x00 and 0x01) are carried over from the
LM1237 ROM where they were reserved for the End-Of-
Screen (EOS) and End-Of-Line (EOL) codes respectively.
(Continued)
FIGURE 19. ROM Bank 0 Two Color Character Font
FIGURE 20. ROM Bank 1 Two Color Character Font
47
In the case of the LM1276, these two locations can be used
for displayable characters as long as they are not needed
when this bank is addressed from Bank Select Register 0. If
it is addressed from Bank Select Registers 1, 2 or 3, then
these two lower characters will be usable. Please see the
section “END-OF-LINE and END-OF-SCREEN CODES”.
Similarly, the first two characters in any bank, which is ad-
dressed from Bank Select Register 0 will not be usable since
those addresses will be interpreted as the EOL and EOS
codes.
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