參數(shù)資料
型號(hào)： ML54051
廠商： LAPIS SEMICONDUCTOR CO LTD
元件分類： 存儲(chǔ)控制器/管理單元
英文描述： FLASH MEMORY DRIVE CONTROLLER, PQFP120
封裝： 14 X 14 MM, 0.40 MM PITCH, PLASTIC, TQFP-120
文件頁(yè)數(shù)： 10/37頁(yè)
文件大?。?/td> 304K
代理商： ML54051
Semiconductor
ML54051
14/33
(2)
Spare area
Flag
FFh
Write
The specified sector is accessed.
0Fh
—
Read
The specified sector is accessed.
—
F0h
The block is labeled as a BAD block. Substitute
processing is performed again to change the
substitute destination.
An uncorrectable error (UNC) is returned and
processing is aborted.
Other values
The substitute destination is detected from the
substitute management information and the
substitute destination is accessed.
If the substitute destination cannot be detected,
the substitute destination obtained by substitute
processing is accessed.
An uncorrectable error (UNC) is returned and
processing is aborted.
Note:
The same flag control is performed in spare areas and user areas.
(3)
D-List area
Flag
FFh
Write
The specified sector is accessed.
Other values
Substitute management information (duplicate)
is used as the new substitute management
information (original). Substitute management
information (duplicate) is written to another
block and used as new substitute management
information (duplicate).
When the Flag of the substitute management
information (duplicate) is not equal to FFh,
substitute management information is
reconstructed.
Read
The specified sector is accessed.
Substitute management information (duplicate)
is used as the new substitute management
information (original). Substitute management
information (duplicate) is written to another
block and used as new substitute management
information (duplicate).
When the Flag of the substitute management
information (duplicate) is not equal to FFh,
substitute management information is
reconstructed.
5.3.1.2
Substitute Management Information Management
In accordance with section 5.1.3, “Substitute Management Information Format”, substitute
management information is arranged beginning at the rear of the spare area.
If two pieces of substitute management information cannot be read correctly, the substitute
source is read from the address of the header section in each sector of a substituted block within
the spare area, a substitute management information is reconstructed.
5.4 Generation of Substitute Management Information
Substitute management information is generated in all chips. An issue of Low Level Format
command as one of the vendor-unique commands initiates a scanning on memories, and
defective block locations in spare area and in user area are identified and substitute correspondance
is registered as a default setting of a substitute management information.
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