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DS2704W Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # DS2704W
Description  1280-Bit EEPROM with SHA-1 Authentication
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS2704W Datasheet(HTML) 6 Page - Maxim Integrated Products

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DS2704: 1280-Bit EEPROM with SHA-1 Authentication
6 of 18
Table 1. Authentication Function Commands
COMMAND
Hex
FUNCTION
Write Challenge
0C
Writes 64-bit challenge for SHA-1 processing. Required prior to
issuing Compute MAC and Compute Next Secret commands.
Compute MAC without ROM ID
and return MAC
36
Computes hash the message block with logical 1’s in place of the
ROM ID. Returns the 160-bit MAC.
Compute MAC with ROM ID and
return MAC
35
Computes hash of the message block including the ROM ID.
Returns the 160-bit MAC.
SECRET MANAGEMENT FUNCTION COMMANDS
CLEAR SECRET [5Ah]. This command sets the 64-bit secret to all 0’s (0000 0000 0000 0000h). The host must
wait tEEC for the DS2704 to write the new secret value to EEPROM. See Figure 10 on page 18 for command timing.
COMPUTE NEXT SECRET WITHOUT ROM ID [30h]. This command initiates a SHA-1 computation of the MAC
and uses a portion of the resulting MAC as the next or new secret. The MAC computation is performed with the
current 64-bit secret and the 64-bit challenge. Logical 1’s are loaded in place of the ROM ID. 64-bits of the output
MAC are used as the new secret value. The host must allow tSHA after issuing this command for the SHA
calculation to complete, then wait tEEC for the DS2704 to write the new secret value to EEPROM. See Figure 8 on
page 17 for command timing.
COMPUTE NEXT SECRET WITH ROM ID [33h]. This command initiates a SHA-1 computation of the MAC and
uses a portion of the resulting MAC as the next or new secret. The MAC computation is performed with the current
64-bit secret, the 64-bit ROM ID and the 64-bit challenge. 64-bits of the output MAC are used as the new secret
value. The host must allow tSHA after issuing this command for the SHA calculation to complete, then wait tEEC for
the DS2704 to write the new secret value to EEPROM. See Figure 8 on page 17 for command timing.
LOCK SECRET [6Ah]. This command write protects the 64-bit Secret to prevent accidental or malicious overwrite
of the secret value. The Secret value stored in EEPROM becomes "final." The host must wait tEEC for the DS2704
to write the lock secret bit to EEPROM. See Figure 10 on page 18 for command timing.
Table 2. Secret Loading Function Commands
COMMAND
Hex
FUNCTION
Clear Secret
5A
Clears the 64-bit Secret to 0000 0000 0000 0000h
Compute Next Secret without
ROM ID
30
Generates new global secret
Compute Next Secret with
ROM ID
33
Generates new unique secret
Lock Secret
6A
Sets lock bit to prevent changes to the Secret
1-WIRE SPEED CONTROL FUNCTION COMMANDS
CLEAR OVERDRIVE [8Dh]. This command selects the Standard 1-Wire timings shown in the Electrical
Characteristics table. The setting is stored in EEPROM so that the programmed speed selection can be recalled on
initial power up. The host must wait tEEC for the DS2704 to write the EEPROM. See Figure 10 for command timing.
Standard 1-Wire timing is the factory default.
SET OVERDRIVE [8Bh]. This command selects the Overdrive 1-Wire timings shown in the Electrical
Characteristics table. The setting is stored in EEPROM so that the programmed speed selection can be recalled on
initial power up. The host must wait tEEC for the DS2704 to write the EEPROM. See Figure 10 for command timing.


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