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DS1977
Figure 13. CRC16 HARDWARE DESCRIPTION AND POLYNOMIAL
Polynomial = X
+X
+X +1
16
15
2
1
st
2
nd
3
rd
4
th
5
th
6
th
7
th
8
th
X
X
X
X
X
X
X
X
0
STAGE
STAGE
1
STAGE
2
STAGE
3
STAGE
4
STAGE
5
STAGE
6
STAGE
7
9
th
10
th
11
th
12
th
13
th
14
th
15
th
16
th
STAGE
STAGE
STAGE
STAGE
STAGE
STAGE
STAGE
STAGE
X
X
X
X
X
X
X
X
X
8
9
10
11
12
13
14
15
16
CRC
INPUT DATA
OUTPUT
COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND
SYMBOL
RST
PD
Select
WS
RS
CPS
RM
VP
RV
TA
TA-E/S
<data to EOS>
<data to EOP>
<PW/dummy>
<64 bytes>
<data>
00h
Password
Version
CRC16
FF loop
AA loop
Strong Pullup
DESCRIPTION
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 with Password"
Command "Read Memory with Password"
Command "Verify Password"
Command "Read Version"
Target Address TA1, TA2
Target Address TA1, TA2 with E/S Byte
Transfer of as Many Data Bytes as are Needed to Reach the Scratchpad Offset 3Fh
Transfer of as Many Data Bytes as are Needed to Reach the End of a Memory Page
Transfer of 8 Bytes that Either Represent a Valid Password or Acceptable Dummy Data
Transfer of 64 Bytes
Transfer of an Undetermined Amount of Data
Transmission of One Byte 00h
Transmission of Password
Transmission of Device Version Number
Transfer of an Inverted CRC16
Indefinite Loop Where the Master Reads FF Bytes
Indefinite Loop Where the Master Reads AA Bytes
Data Transfer to/from EEPROM (Data or Passwords Memory); No Activity on the 1-Wire
Bus Permitted During this Time
23 of 29
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