參數(shù)資料
型號(hào)： DS2423X
廠商： DALLAS SEMICONDUCTOR
元件分類： Memory IC:Other
英文描述： SPECIALTY MEMORY CIRCUIT, UUC
封裝： CHIP SCALE PKG
文件頁(yè)數(shù)： 19/25頁(yè)
文件大?。?/td> 579K
代理商： DS2423X
DS2422/DS2423
3 of 25
BLOCK DIAGRAM Figure 1
MEMORY
The memory map in Figure 5 shows a 32-byte page called the scratchpad and an additional 32-byte pages
called memory. The DS2422 contains pages 0 through 3 which make up the 1024-bit SRAM. The
DS2423 contains pages 0 through 15 which make up the 4096-bit SRAM. The scratchpad is an additional
page that acts as a buffer when writing to memory.
ADDRESS REGISTERS AND TRANSFER STATUS
Because of the serial data transfer, the DS242X employs three address registers, called TA1, TA2 and E/S
(Figure 6). Registers TA1 and TA2 must be loaded with the target address to which the data will be
written or from which data will be sent to the master upon a Read command. Register E/S acts like a byte
counter and Transfer Status register. It is used to verify data integrity with write commands. Therefore,
the master only has read access to this register. The lower 5 bits of the E/S register indicate the address of
the last byte that has been written to the scratchpad. This address is called Ending Offset. Bit 5 of the E/S
register, called PF or “partial byte flag,” is set if the number of data bits sent by the master is not an
integer multiple of 8. Bit 6 has no function; it always reads 0. Note that the lowest 5 bits of the target
address also determine the address within the scratchpad, where intermediate storage of data will begin.
This address is called byte offset. If the target address (TA1) for a Write command is 03CH for example,
then the scratchpad will store incoming data beginning at the byte offset 1CH and will be full after only 4
bytes. The corresponding ending offset in this example is 1FH. For best economy of speed and efficiency,
the target address for writing should point to the beginning of a new page, i.e., the byte offset will be 0.
Thus the full 32-byte capacity of the scratchpad is available, resulting also in the ending offset of 1FH.
However, it is possible to write one or several contiguous bytes somewhere within a page. The ending
offset together with the Partial Flag support the master checking the data integrity after a Write command.
The highest valued bit of the E/S register, called AA or Authorization Accepted, acts as a flag to indicate
that the data stored in the scratchpad has already been copied to the target memory address. Writing data
to the scratchpad clears this flag.
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PDF描述
DS2423 4K X 1 STANDARD SRAM, PDSO6
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DS2430AP 256 X 1 1-WIRE SERIAL EEPROM, PDSO6
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS243 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
DS2430 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:256-Bit 1-Wire EEPROM
DS2430A 功能描述:電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
DS2430A R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:256-Bit 1-Wire EEPROM
DS2430A T 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:256-Bit 1-Wire EEPROM
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