DS24B33 Maxim, DS24B33 Datasheet - Page 20

• Manufacturer Part Number: DS24B33
• Description: The DS24B33 is a 4096-bit, 1-Wire® EEPROM organized as 16 memory pages of 256 bits each
• Manufacturer: Maxim

1-Wire 4Kb EEPROM
Figure 13. CRC-16 Hardware Description and Polynomial
20
X
______________________________________________________________________________________
8
<data to EOM>
<data to EOS>
X
Programming
0
SYMBOL
STAGE
AA loop
CRC-16
FF loop
9TH
TA-E/S
Select
STAGE
RST
CPS
RM
WS
1ST
PD
RS
TA
X
9
X
1
STAGE
10TH
Command-Specific 1-Wire Communication Protocol—Legend
STAGE
2ND
X
1-Wire reset pulse generated by master
1-Wire presence pulse generated by slave
Command and data to satisfy the ROM function protocol
Command: “Write Scratchpad”
Command: “Read Scratchpad”
Command: “Copy Scratchpad”
Command: “Read Memory”
Target Address TA1, TA2
Transfer of an inverted CRC-16
Indefinite loop where the master reads FF bytes
Indefinite loop where the master reads AA bytes
Target Address TA1, TA2 with E/S byte
Transfer of as many bytes as needed to reach the end of the scratchpad for a given target address
Transfer of as many bytes as are needed to reach the end of the memory
Data transfer to EEPROM; no activity on the 1-Wire bus permitted during this time
10
STAGE
11TH
X
11
X
2
STAGE
12TH
STAGE
3RD
X
POLYNOMIAL = X
12
X
3
STAGE
13TH
STAGE
4TH
X
13
16
X
+ X
4
STAGE
14TH
15
STAGE
+ X
5TH
DESCRIPTION
2
+ 1
X
14
X
5
STAGE
15TH
STAGE
6TH
X
6
STAGE
7TH
X
15
X
INPUT DATA
7
STAGE
16TH
STAGE
8TH
X
16
CRC OUTPUT