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參數(shù)資料
| 型號： | LM1236 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器254字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置 |
| 文件頁數(shù)： | 26/43頁 |
| 文件大小： | 1898K |
| 代理商： | LM1236 |
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LM1236 Address Map
(Continued)
TABLE 4. Character ROM Addressing
Address Range
0x0000–0x2FFF
R/W
R
Description
ROM Character Fonts, 190 two-color Character Fonts that are
read-only. The format of the address is as follows: A15-A14: Always
zero. A13-A16: Character value (0x00-0xBF are valid values)
A5-A1: Row of the character (0x00-0x011 are valid values) A0: Low
byte of line when a zero. High byte of line when a one. The low
byte will contain the first eight pixels of the line with data Bit 0
corresponding to the left most bit in the Character font line. The
high byte will contain the last four pixels and data. Bits 7-4 are
"don’t cares". Data Bit 3 of the high byte corresponds to the right
most pixel in the Character Font line.
ROM Character Fonts, 64 four-color Character Fonts that are
read-only. The format of the address is as follows: A15-A14: Always
zero. A13-A16: Character value (0xC0-0xFF are valid values)
A5-A1: Row of the character (0x00-0x011 are valid values) A0: Low
byte of line when a zero. High byte of line when a one. The low
byte will contain the first eight pixels of the line with data Bit 0
corresponding to the left most bit in the Character font line. The
high byte will contain the last four pixels and data. Bits 7-4 are
"don’t cares". Data Bit 3 of the high byte corresponds to the right
most pixel in the Character Font line.
Reserved
0x3000–0x3FFF
R
0x4000–0x7FFF
-
DISPLAY PAGE RAM
This address range (0x8000–0x81FF) contains the 512 characters, which comprise the displayable OSD screens. There must be
at least one End-Of-Screen code (0x00) in this range to prevent unpredictable behavior.
NOTE:
To avoid any unpredictable
behavior, this range should be cleared by writing a 0 to bit 3 of the FRMCTRL1 Register, 0x8400, immediately after power up.
There may also be one or more pairs of End-Of-Line and Skip Line codes. The codes and characters are written as 8-bit bytes,
but are stored with their attributes in groups of 13 bits. When writing, one byte describes a displayed character (CC), Attribute
Code (AC), End-Of-Screen (EOS), End-Of-Line (EOL) or Skip Line (SL) code.
When reading characters from RAM, bit 1 of the Character Font Access Register (0x8402) determines whether the lower 8 bits
or upper 4 bits of the Page RAM are returned.
Table 5
gives the lower byte read, which is the first 8 character code bits when bit
1 of the Character Font Access Register is a 0.
Table 6
gives the upper byte read, which is 4 attribute code bits when this bit is
set to a 1.
TABLE 5. Page RAM Lower Byte Read Data
Address Range
0x8000–0x81FF
D7
D6
D5
D4
D3
D2
D1
D0
CHAR_CODE[7:0]
TABLE 6. Page RAM Upper Byte Read Data
Address
0x8000–0x81FF
D7
X
D6
X
D5
X
D4
X
D3
D2
D1
D0
ATTR_CODE[3:0]
RAM Data Format
Each of the 512 locations in the page RAM is comprised of a 12-bit code consisting of an 8-bit character or control code, and a
4-bit attribute code. Each of the characters is stored in sequence in the page RAM in bits 7:0. Special codes are used between
lines to show where one line ends and the next begins, and also to allow blank (or ‘skipped’) single scan lines to be added
between character lines.
Table 7
shows the format of a character stored in RAM. Note that even though this is a 12- bit format,
reading and writing characters and codes is done in 8-bit bytes.
TABLE 7. Page RAM Format
ATTRIBUTE CODE
ATT[3:0]
CHARACTER CODE
CC[7:0]
Bits 11–4 (Character Code): These 8 bits define which of the 254 characters is to be called from the character ROM. Valid
character codes are 0x02-0xFF. Bits 3–0 (Attribute Code): these 4 bits address the attribute table used to specify which of the 16
locations in RAM specify the colors and enhanced features to be used for this particular character. Two seperate attribute tables
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1236AAA/NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1237 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
| LM1237_04 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
| LM1237AAF/NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
| LM1237BAAF/NA | 功能描述:IC PREAMP CMOS 150MHZ 24-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
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