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參數(shù)資料
| 型號： | DS1280 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3-Wire to Bytewide Converter Chip(3線至字節(jié)寬度（8位）轉(zhuǎn)換芯片) |
| 中文描述： | 3線，以Bytewide轉(zhuǎn)換器芯片（3線至字節(jié)寬度（8位）轉(zhuǎn)換芯片） |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 132K |
| 代理商： | DS1280 |
DS1280
021998 7/11
SELECT BITS MASK
Figure 3
LSB
MSB
SELECT BITS
UNMASK 2 LSB’S
UNMASK 4 LSB’S
UNMASK 6 LSB’S
UNMASK 8 LSB’S
UNMASK 10 LSB’S
UNMASK 12 LSB’S
UNMASK 14 LSB’S
MASK ALL
BYTE 5
BYTE 4
S15 S14 S13
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
COMMAND FIELD
1
X
0
1
1
1
1
1
1
1
1
1
1
1
1
X
X
0
0
0
0
0
0
0
0
0
0
0
1
ARBITRATION BYTE
Figure 4
C2
S1
S0
MSB
LSB
P1
P0
S2
C1
C0
PARALLEL
BUS
STATUS
BITS
NOT
USED
SERIAL
PORT
STATUS
BITS
COUNT
BIT
NOT
USED
NOT
USED
COUNT
BIT
COUNT
BIT
CRC GENERATION
The logic involved in CRC generation is shown in Figure
5. It is comprised of an 8-bit shift register, four exclusive
OR gates, and two sets of transmission gates. The
transmission gates serve to divert data from DQIN to
the CRC generator while each byte is being assembled
and, at the same time, output data to the output (DQ
OUT). When input select CRC (SDCRC) is driven to an
active level (high), data is output at DQOUT from the
CRC generator using the clock input (CK) in the same
manner as described earlier for operation of the 3-wire
serial bus.
The reset signal (RSB) must be high while the CRC gen-
erator is being used, as an inactive state will disable the
8-bit shift register. This signal is the same as the reset
described for the 3-wire serial bus. A CRC generator for
serial port communications can be constructed as de-
scribed above to satisfy the DS1280 CRC require-
ments. However, another approach is to generate the
CRC using software. An example of how this is accom-
plished using assembly language follows. This assem-
bly language code is written for the DS5000 Soft Micro-
controller. The assembly language procedure DO CRC
given below calculates the cumulative CRC of all the
bytes passed to it in the accumulator. Before it is used to
calculate the CRC of a data stream, it should be initial-
ized by setting the variable CRC to zero. Each byte of
the data is then placed in the accumulator and DO CRC
is called to update the CRC. After all the data has been
passed to DO CRC, the variable CRC will contain the re-
sult.
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