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參數(shù)資料
| 型號(hào)： | DS1205S |
| 英文描述： | MultiKey Chip |
| 中文描述： | 多密鑰芯片 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大小： | 138K |
| 代理商： | DS1205S |
DS1205S
021798 2/17
INTERFACES
Two interfaces to the DS1205S are provided. The
1-wire interface requires a 1-wire I/O command for ad-
dressing the device. An additional function command
word is then passed through the 1-wire interface to ac-
cess the various DS1205S functions. The 3-wire inter-
face (data (DQ), reset (RST), and clock (CLK)) requires
only the function command word. The four 1-wire I/O
commands that deal with the unique lasered ROM are
available only through the 1-wire interface. All other
functions are available through either interface.
FUNCTIONS
A command word written written to the DS1205S Multi-
Key specifies the operation to be performed and the
partition to be operated on. There are two classes of
functions available. One class includes operations on
the read/write secure partitions. The other class in-
cludes operations on the read/write scratchpad
(Figure 1).
COMMAND OPERATIONS
Figure 1
COMMAND WORD
(24 BITS)
SUBKEY 0
SUBKEY 1
SUBKEY 2
SECURE READ/WRITE
READ/WRITE
SCRATCHPAD
The 24 bit function command word is organized into
three fields of eight bits each. These one byte fields in-
clude the function to be performed, the memory partition
to be accessed and the starting byte address for the
data transfer operation. The starting byte address and
the partition codes are required to be given in both real
and complement form. If these values do not match, ac-
cess to the part will be denied (Figure 2).
The function command word is presented to the
DS1205S LSB first. The first byte contains the 8-bit
function code that defines which of the six valid function
codes is to be executed. Each function code is valid for
only certain partition and starting address combina-
tions. Figure 3 illustrates the valid partition code, start-
ing address and function code combinations. The se-
cond byte consists of the 2-bit partition code, identifying
which partition is being accessed, and the 6-bit starting
byte address, which specifies where to start the access
of the given partition. The third byte consists of the com-
plement of the 2-bit partition code and the complement
of the 6-bit starting byte address.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1205V | MultiKey |
| DS1208 | dallas semiconductor reliability report |
| DS1210 | Nonvolatile Controller Chip |
| DS1211 | Nonvolatile Controller x 8 Chip |
| DS1217M | Nonvolatile Read/Write Cartridge |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1205V | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:MultiKey |
| DS1206N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral Interface |
| DS1206S | 制造商:Maxim Integrated Products 功能描述: |
| DS1206SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral Interface |
| DS1207 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MISC MEMORY|MODULE|5PIN|PLASTIC |
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