DS2704G+ MAXIM [Maxim Integrated Products], DS2704G+ Datasheet - Page 16

• Manufacturer Part Number: DS2704G+
• Description: 1280-Bit EEPROM with SHA-1 Authentication
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 8. Guide to Function Command Requirements
Write Challenge
Compute MAC
Compute Next Secret
Clear/Lock Secret,
Set/Clear Overdrive
Read Memory
Read Data/Gen CRC
Read All
Read Status
Write Status
Write Scratchpad
Read Scratchpad
Copy Scratchpad
Reset
Figure 7: Compute MAC Function Command
1-Wire
Reset
Presence
COMMAND
Pulse
SKIP ROM
Cmd
ISSUE MEMORY
16 bits: TA1, TA2
16 bits: TA1, TA2
16 bits: TA1, TA2
16 bits
8 bits
8 bits
16 bits: TA1, TA2
Compute
ADDRESS
MAC
Cmd
Wait for MAC
Computation
ISSUE 00H
t
SHA
BEFORE
READ
Yes
16 of 18
DS2704: 1280-Bit EEPROM with SHA-1 Authentication
Write: 64
Read: up to 160
Read:
up to 1024 (data)
up to 16 (CRC)
Read:
up to 1024 (data)
up to 40 (CRC)
Read:
up to 1280 (data)
Read:
up to 64 (data)
up to 16 (CRC)
Write: 8
Write: up to 64
Read: up to 64
READ/WRITE
TIME SLOTS
Time Slots
8 Write 0
Up to 160 Read Time Slots
After CMD + TA2:TA1,
End of Page 3
After CMD + TA2:TA1,
End of each page
After CMD + TA2:TA1,
End of Page 4
After CMD + TA2:TA1,
End of Status field
(Read 20-Byte MAC)
READBACK CRC