LM1237BAAF/NA National Semiconductor, LM1237BAAF/NA Datasheet - Page 38

• Manufacturer Part Number: LM1237BAAF/NA
• Description: IC PREAMP CMOS 150MHZ 24-DIP
• Manufacturer: National Semiconductor
• Type: Preamplifierr

Specifications of LM1237BAAF/NA

• Applications: OSD Monitors, Drivers
• Mounting Type: Through Hole
• Package / Case: 24-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM1237BAAF/NA; *LM1237BAAF/NA/NOPB; LM1237BAAF/NA/NOPB; LM1237BAAF/NANOPB; LM1237BAAF/NANOPB

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Pre-Amplifier Interface Registers
SOFTWARE RESET AND TEST CONTROL REGISTER
Register Name (address): SRTSTCTRL (0x843F)
Attribute Table and Enhanced Features
Each display character and SL in the Display Page RAM will have a 4-bit Attribute Table entry associated with it. The user should
note that two-color display characters and four-color display characters use two different Attribute Tables, effectively providing 16
attributes for two-color display characters and 16 attributes for four-color display characters.
For two-color characters the attribute contains the code for the 9-bit foreground color (Color 2), the code for the 9-bit background
color (Color 1), and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing, Bordering, etc.).
For four-color characters the attribute contains the code for the 9-bit Color 1, the code for the 9-bit Color 2, the code for the 9-bit
Color 3, the code for the 9-bit Color 4 and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing,
Bordering, etc.).
TWO COLOR ATTRIBUTE FORMAT
Register Names (addresses):
ATT2C3n (0x8443+n
value as described in Table 100.
Bit 3
Bit 4
Bit 5
Bits 7–6
Bit 0
Bits 5–1
Bit 6
Bit 7
Bits 8–0
Bits 17–9
Bits 21 –18 These are the enhanced feature (EF) bits which determine which feature is applied to the displayed character.
Bits 31–22
C2B0 C2G2 C2G1 C2G0 C2R2 C2R1 C2R0 C1B2 C1B1 C1B0 C1G2 C1G1 C1G0 C1R2 C1R1 C1R0
RSV
31
15
RSV
Bits 21–18
7
RSV
0000b
0001b
0010b
30
14
These nine bits determine the background color (color1) which is displayed when the corresponding OSD
pixel is a 0.
These nine bits determine the foreground color (color2) which is displayed when the corresponding OSD pixel
is a 1.
The features and their corresponding codes are shown in Table 13. Enhanced Feature Descriptions.
Reserved and should be set to zero.
When this bit is a 1, all registers except this one are loaded with their default values. All operations are
aborted, except data transfers in progress on the I
complete.
Reserved and should be set to zero.
This bit disables the register Auto-Increment feature of the I
Auto-Increment is disabled and when a 0, AI is enabled.
Reserved and should be set to zero.
RSV
29
13
This is the OSD override bit. This should be set to 0 for normal operation. When set to a 1, the video
outputs are disconnected and OSD only is displayed. This is useful for the OSD display of special
conditions such as “No Signal” and “Input Signal Out of Range”, to avoid seeing unsynchronized video.
Reserved and should be set to zero.
This is the Clamp Polarity bit. When set to a 0, the LM1237 expects a positive going clamp pulse.
When set to a 1, the expected pulse is negative going.
Reserved and should be set to zero.
*
AID
4), ATT2C2n (0x8442+n
6
RSV
Normal Display (color2/color1)
Blinking
Shadowing
28
12
RSV
27
11
RSV
5
TABLE 13. Enhanced Feature Descriptions
RSV
26
10
*
4), ATT2C1n (0x8441+n
RSV
25
9
RSV
4
RSV
(Continued)
24
8
38
RSV
Feature Description
23
7
2
C compatible bus. This bit clears itself when the reset is
RSV
3
*
RSV
4), ATT2C0n (0x8440+n
22
6
2
C compatible protocol. When set to a 1
EFB3 EFB2 EFB1 EFB0 C2B2 C2B1
21
5
RSV
2
20
4
19
*
3
4), where n is the attribute
RSV
1
18
2
17
1
SRST
0
16
0