LM1276AAA National Semiconductor, LM1276AAA Datasheet - Page 28

• Manufacturer Part Number: LM1276AAA
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

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Register
FRMCTRL1
FRMCTRL2
CHARFONTACC
VBLANKDUR
CHARHTCTRL
BBHLCTRLB0
BBHLCTRLB1
BBLLCTRLB0
BBLLCTRLB1
CHSDWCTRLB0
CHSDWCTRLB1
ROMSIGCTRL
ROMSIGDATAB0
ROMSIGDATAB1
HSTRT1
VSTRT1
W1STRTADRL
W1STRTADRH
COLWIDTH1B0
COLWIDTH1B1
COLWIDTH1B2
COLWIDTH1B3
HSTRT2
VSTRT2
W2STRTADRL
W2STRTADRH
COLWIDTH2B0
COLWIDTH2B1
COLWIDTH2B2
COLWIDTH2B3
Any registers in the range of 0x8420–0x8426 are for National Semiconductor internal use only and should not be written to under
application conditions.
FADE_INTVL
LM1276 Address Map
Bits 8–0 are all zeros. Bits 12–9 will have the previously entered AC but this is not used and so these bits are “don’t cares”.
OSD CONTROL REGISTERS
These registers, shown in Table 11, control the size, position, enhanced features and ROM bank selection of up to two
independent OSD windows. These registers are compatible to the LM1246 OSD control Registers. Any bits marked as “X”
are reserved and should be written to with zeros and should be ignored when the register is read. Additional register detail is
provided in the Control Register Definitions Section, later in this document.
PREAMPLIFIER CONTROL
These registers, shown in Table 12, control the gains, DAC outputs, PLL, horizontal and vertical blanking, OSD contrast and DC
offset of the video outputs. Registers 0x8430–0x8437 are compatible to the LM1246 Registers. Any bits marked as “X” are
reserved and should be written to with zeros and should be ignored when the register is read. Additional register detail is provided
in the Control Register Definitions Section, later in this document.
ATTRIBUTE CODE
ATT[3:0]
Address
0x840A
0x840D
0x840E
0x841A
0x841B
0x841C
0x841D
0x841E
0x8400
0x8401
0x8402
0x8403
0x8404
0x8405
0x8406
0x8407
0x8408
0x8409
0x840F
0x8410
0x8412
0x8413
0x8414
0x8415
0x8416
0x8417
0x8418
0x8419
0x841F
0x8429
0x8411
Default
0xFF
0x5B
0x98
0x80
0x00
0x10
0x51
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x62
0x32
0x00
0x00
0x00
0x00
0x00
0x00
0x56
0x00
0x01
0x00
0x00
0x00
0x00
0x35
(Continued)
ASZDN
SRST
TABLE 11. OSD Control Register Detail
D7
PIXELS_PER_LINE[2:0]
X
X
X
X
X
X
X
0
TABLE 10. End-Of-Screen Code
G[1:0]
G[1:0]
G[1:0]
ASZEN
RSV
D6
0
V_INTVL[3:0]
X
X
X
X
X
X
28
0
RSV
FEN
D5
X
X
X
X
X
X
END-OF-SCREEN CODE
CHAR_HEIGHT[7:0]
0
R[2:0]
R[2:0]
R[2:0]
LIMIT
VBLANK_DURATION[6:0]
D4
TD
X
X
X
X
X
X
COL1[23:16]
COL1[31:24]
COL2[23:16]
COL2[31:24]
HPOS1[7:0]
VPOS1[7:0]
ADDR1[7:0]
HPOS2[7:0]
VPOS2[7:0]
ADDR2[7:0]
COL1[15:8]
COL2[15:8]
CRC[15:8]
COL1[7:0]
COL2[7:0]
CRC[7:0]
0
VSYPOL HSYPOL
CDPR
D3
X
X
X
X
X
X
BLINK_PERIOD[4:0]
0
D2E
H_INVTVL[3:0]
D2
X
X
X
X
X
X
0
B[2:0]
B[2:0]
B[2:0]
ATTR
D1E
D1
X
X
X
X
X
X
0
ADDR1[8]
ADDR2[8]
FONT4
OSE
CRS
G[2]
G[2]
G[2]
D0
0