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參數(shù)資料
| 型號(hào)： | MC4GH02GNMCA-2SA00 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | SAMSUNG MultiMediaCard |
| 中文描述： | 三星多媒體 |
| 文件頁(yè)數(shù)： | 55/102頁(yè) |
| 文件大?。?/td> | 1384K |
| 代理商： | MC4GH02GNMCA-2SA00 |
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MultiMediaCard
TM
55
Sep.22.2005
Revision 0.3
CRC16
The CRC16 is used for payload protection in block transfer mode. The CRC check sum is a 16-bit value and is computed
as follows:
x
16
x
12
+
=
x
n
second bit
(
)
+
×
=
x
16
(
[
=
Generator polynomial
All CRC registers are initialized to zero. The first bit is the first data bit of the corresponding block. The degree
n
of the
polynomial denotes the number of bits of the data block decreased by one (e.g. n = 4095 for a block length of 512 bytes).
The generator polynomial
is a standard CCITT polynomial. The code has a minimal distance d=4 and is used for a
payload length of up to 2048 Bytes (n <= 16383).
The same CRC16 calculation is used for all bus configurations. In 4 bit and 8 bit bus configurations, the CRC16 is calcu-
lated for each line separately. Sending the CRC is synchronized so the CRC code is transferred at the same time in all
lines.
Figure 6-4 : CRC16 Generator/Checker
G x
x
5
x
n
1
+
+
–
M x
first bit
(
)
1
…
last bit
(
)
x
0
×
+
+
×
CRC
15
…
0
[
]
Remainder
M x
)
G x
]
G x
data in
data out
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