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參數(shù)資料
| 型號： | LM1247AAG/NA/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 31/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
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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)
Bit 7
This bit is reserved and should be set to 0.
ROM Bank Select Register B:
BANKSEL_2-3 (0x8428)
Res’d
Bank Select 3
Res’d
Bank Select 2
X
B3AD[2:0]
X
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)
Bit 3
This bit is reserved and should be set to 0.
Bits 6–4
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)
Bit 7
This bit is reserved and should be set to 0.
The actual address for any character in ROM is formed, in logic, from the address in the Page RAM, by this sequence (also see
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
Upper Two Bits
Three Bit Bank Address
Source
00xxxxxxb
00b
B0AD[2:0]
01xxxxxxb
01b
B1AD[2:0]
10xxxxxxb
10b
B2AD[2:0]
11xxxxxxb
11b
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]
Character ROM Address Range
ROM Character Type
000b
0x000 - 0x03F
2 Color
001b
0x040 - 0x07F
2 Color
010b
0x080 - 0x0BF
2 Color
011b
0x0C0 - 0x0FF
4 Color
100b
0x100 - 0x13F
2 Color
101b
0x140 - 0x17F
2 Color
110b
0x180 - 0x1BF
2 Color
111b
0x1C0 - 0x1FF
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.
LM1247
www.national.com
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