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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)： | 4/17頁 |
| 文件大?。?/td> | 138K |
| 代理商： | DS1205S |
DS1205S
021798 4/17
SET SECURITY MATCH
The Set Security Match command is used to enter data
into the I.D. and security match fields of the selected se-
cure partition. The DS1205S will respond to the com-
mand by outputting the 64-bit I.D. field of the selected
secure partition. The next 64 clock cycles are used to
echo the I.D. field back to the DS1205S. Upon receipt of
the correct I.D., the DS1205S MultiKey will erase the
contents of the selected secure partition. The part is
then ready to receive the the new 64-bit I.D. and the
64-bit security match code. The flow sequence is
shown in Figure 5.
SET SECURE DATA
The Set Secure Data command is used to write data into
the selected secure partition. After the command is re-
ceived by the DS1205S, the 64-bit I.D. field of the se-
lected secure partition is output. The next 64 bits of in-
put comprise a password that must match the security
match code of the selected secure partition. If the pass-
word and the security match are identical, data is written
to the secure data field starting at the address specified
in the command word. If the password and the security
match code are not identical, the DS1205S will termi-
nate the transaction immediately. The flow sequence is
shown in Figure 6.
GET SECURE DATA
The Get Secure Data command is used to retrieve data
from the selected secure partition. After the command
word is received by the DS1205S, the 64-bit I.D. field of
the selected secure partition is returned. The next 64
bits are the password being written to the DS1205S. If
the presented password and the security match code of
the selected secure partition are identical, the DS1205S
will output the contents of the secure data field starting
from the byte specified in the command word. If the
presented password is not identical to the security
match code, the DS1205S MultiKey will use the pass-
word as a “seed” for its internal random number genera-
tor. This results in a repeatable, seemingly valid yet
false response to the invalid password. The flow se-
quence is shown in Figure 7.
SCRATCHPAD READ/WRITE COMMANDS
The 512-bit read/write scratchpad of the DS1205S Mul-
tiKey is not protected by a security match code. This
partition is byte addressable. The scratchpad can be
used to store unsecured data or it can act as a staging
area to build and verify data structures to be transferred
to a secure partition. The three commands that operate
on the read/write scratchpad are:
1. Set Scratchpad Data
2. Get Scratchpad Data
3. Move Block
SET SCRATCHPAD DATA
The Set Scratchpad Data command is used to enter
data into the DS1205S MultiKey scratchpad. The com-
mand word must specify the starting byte address for
the data transfer. Valid byte addresses are 0 through 63.
The DS1205S MultiKey will write data to the scratchpad
until byte 63 has been written or until the RST line goes
to a logic low level. The flow sequence is shown in
Figure 8.
GET SCRATCHPAD DATA
The Get Scratchpad data command is used to retrieve
data from the 512-bit scratchpad. The command word
must specify the starting byte address for the data re-
trieval. Valid byte addresses are 0 through 63. The
DS1205S MultiKey will retrieve data from the scratch-
pad until byte 63 has been read or the RST line goes to a
logic low level. The flow sequence is shown in Figure 9.
MOVE BLOCK
The Move Block command is used to transfer data,
which has been previously entered into the scratchpad
and verified, to one of the three secure subkeys. Data
can be transferred as one large block of 512 bits or it can
be transferred in blocks of 64 bits each (Figure 10).
There are nine valid block selectors which are used to
specify which block or blocks are to be transferred
(Figure 11). As a further precaution against accidental
erasure of a secure subkey, the 64-bit password of the
destination subkey must be entered and match the des-
tination subkey. If the passwords fail to match, the oper-
ation is terminated. The flow sequence is shown in
Figure 12.
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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