參數(shù)資料
型號(hào)： romr0002
廠商： SIEMENS AG
英文描述： MultiMediaCard R0002 2 Mbyte ROM(多媒體卡 R0002 2 Mbyte ROM)
中文描述： 多媒體R0002 2字節(jié)的光盤(pán)（多媒體卡R0002 2字節(jié)光盤(pán)）
文件頁(yè)數(shù)： 28/41頁(yè)
文件大?。?/td> 207K
代理商： ROMR0002
Siemens
Product Manual R0002
Semiconductor Group
28
3.1
7
Error handling
The R0002 is defined as an error free device. To protect the data against errors generated during
the transport over the MultiMediaCard bus dynamically, an additional feature is implemented:
The cyclic redundancy check (CRC).
Following the MultiMediaCard standard, the R0002 uses two different CRC codes to protect the
data and the command/response transfer between card and host. The CRC is intended only to
detect transfer errors and not to correct them “on the fly”. If a CRC error is detected the host has to
react. This is normally done by repeating the last command.
The first CRC code is intended to protect the command and response frames. They are also used to
synchronize the data stream. This CRC is generated with and checked against the following polyno-
mial:
CRC polynomial: G(x) = x
7
+ x
3
+ 1
M(x) = (start bit) * x
39
+...+ (last bit) * x
0
CRC[6...0] = Remainder [(M(x) * x
7
) / G(x)]
One CRC is checked in the R0002 for every command. For each response a CRC is generated in
the R0002. On CRC failure the command will be ignored and a response is sent to initiate a repeti-
tion of the command by the host. Each data block read from the R0002 will be succeeded by redun-
dancy bits generated with the second CRC. The code is usable for payload lengths of up to 2048
Bytes:
CRC polynomial:
G(x) = x
16
+ x
12
+x
5
+ 1,
M(x) = (start bit) * x
n
+ x
n-1
+...+ (last bit) * x
0
, with n
<
2048
8
CRC[15...0] = Remainder [(M(x) * x
16
) / G(x)]
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