參數(shù)資料
型號: PCB2032V
元件分類: DRAM
英文描述: EEPROM
中文描述: EEPROM的
文件頁數(shù): 5/18頁
文件大?。?/td> 220K
代理商: PCB2032V
1997 Feb 03
5
Philips Semiconductors
Product Specification
Memory card IC
PCB2032
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).
All bytes of the two memory areas of PCB2032 can always
be read out.
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
MAIN MEMORY
PROTECTION BITS
32 BIT / 4 BYTE
255
32
31
0
31
0
MSB
LSB
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