參數(shù)資料
型號(hào)： PCF2042V
元件分類： DRAM
英文描述： EEPROM
中文描述： EEPROM的
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 264K
代理商： PCF2042V
1997 Feb 03
5
Philips Semiconductors
Product Specification
Memory card IC
PCF2042 V2
5
MEMORY CONFIGURATION
The IC contains 256 byte EEPROM of Main Memory,
divided into a protected and main area. The protected
Memory of 32 byte is located at the first address locations
of the main area with the remaining 224 bytes. All
protectable bytes have associated Protection bits
(32 bit/4 byte). In addition to this memory mapping the
PCF2042 is provided with a separate Security Memory of
32 bit/4 byte.
All bytes of the three memory areas can always be read
out, except of the Reference Data. When the command
“Read Security Memory” is applied before write access to
all memories has been enabled, the Reference Data are
superseded by 0x00.
Generally, the write access to all memories is protected by
a 24-bit/3 byte Reference Data. After a successful
comparison with the Verification Data (see section 5.4.4)
the write access to Main Memory, Protection Memory and
Security Memory as well as read-out of the reference data
is enabled.
The Error Counter counts the number of failed
comparisons of Verification/Reference Data. Only the last
three bits are significant. The five higher bits are
permanently LOW.
The Protection bits are used to inhibit alteration of data
stored in the first 32 bytes of the Main Memory. The two
states of the Protection bits are defined as:
HIGH = Write enabled
LOW = Write disabled
When a Protection bit has been programmed to LOW a
reset of that bit to HIGH is inhibited. Thus, information
stored in the first 32 bytes of the Main Memory are
protected against any alteration.
Fig.2 Memory mapping.
MAIN MEMORY
AREA
MAIN MEMORY
BYTEWISE FREEZABLE
BY PROTECTION BITS
PROTECTION
BITS
REFERENCE DATA
REFERENCE DATA
REFERENCE DATA
MAIN MEMORY
PROTECTION BITS
SECURITY MEMORY
32 BIT / 4 BYTE
32 BIT / 4 BYTE
255
32
31
0
31
0
1
0
2
3
MSB
MSB
LSB
LSB
00000
PERMA-
NENT
3 BIT
ERROR
COUNTER
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