參數(shù)資料
型號： LM1247
廠商： National Semiconductor Corporation
英文描述： 150 MHz I2C Compatible RGB Preamplifier with Internal 512 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512個字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置
文件頁數(shù)： 37/48頁
文件大?。?/td> 3141K
代理商： LM1247
Control Register Definitions
(Continued)
Bits 6–4
This three bit field determines the ROM bank (0-7) selected when the upper two bits of the
character address in Page RAM are 01 (Character Address = 01xxxxxxb)
This bit is reserved and should be set to 0.
Bit 7
ROM Bank Select Register B:
BANKSEL_2-3 (0x8428)
Bank Select 3
B3AD[2:0]
Res’d
X
Res’d
X
Bank Select 2
B2AD[2:0]
Bits 2–0
This three bit field determines the ROM bank (0-7) selected when the upper two bits of the Page
RAM addresses are 10 (Character Address = 10xxxxxxb)
This bit is reserved and should be set to 0.
This three bit field determines the ROM bank (0-7) selected when the upper two bits of the Page
RAM addresses are 11 (Character Address = 11xxxxxxb)
This bit is reserved and should be set to 0.
Bit 3
Bits 6–4
Bit 7
The actual address for any character in ROM is formed, in logic, from the address in the Page RAM, by this sequence (also see
Figure 13
):
1.
The upper 2 bits of the character address in Page RAM are used to address one of the four 3 bit fields in Bank Select Register
A or Bank Select Register B. As shown in
Table 22
, depending on which of the four values is present, the corresponding 3
bit bank address is obtained from the BANKSEL_0, BANKSEL_1, BANKSEL_2, or BANKSEL_3 field shown in the last
column.
TABLE 22. Address Lookup
Character Address in
Page RAM
00xxxxxxb
01xxxxxxb
10xxxxxxb
11xxxxxxb
Upper Two Bits
00b
01b
10b
11b
Three Bit Bank Address
Source
B0AD[2:0]
B1AD[2:0]
B2AD[2:0]
B3AD[2:0]
2.
Then, the 3 bit address obtained from B0AD[2:0], B1AD[2:0], B2AD[2:0] and B3AD[2:0] are used to select four of the eight
2 or 4 color ROM banks as shown in
Table 23
. The BxAD[2:0] column gives the range of three bit addresses and the next
two columns give the corresponding ROM address range and the character type.
TABLE 23. Resulting ROM Bank Address
BxAD[2:0]
000b
001b
010b
011b
100b
101b
110b
111b
Character ROM Address Range
0x000 - 0x03F
0x040 - 0x07F
0x080 - 0x0BF
0x0C0 - 0x0FF
0x100 - 0x13F
0x140 - 0x17F
0x180 - 0x1BF
0x1C0 - 0x1FF
ROM Character Type
2 Color
2 Color
2 Color
4 Color
2 Color
2 Color
2 Color
4 Color
3.
In summary, the final ROM character address is formed by concatenating (combining end to end) the three bits of the
corresponding Bank Address Register with the lower six bits of the original character address in RAM. Since just the two
highest bits of the Page RAM address are used, only 4 banks can be addressed at one time.
L
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LM1247AAG/NA 功能描述:IC PREAMP CMOS 150MHZ 24DIP RoHS:否 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
LM1247DMC/NA 制造商:Texas Instruments 功能描述:
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LM124AD 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS
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