Rainbow Electronics DS2422 - Manual (Page 10)

DS2422
10 of 48
Figure 5. 64-Bit Lasered ROM
MSB LSB
8-Bit
CRC Code
48-Bit Serial Number
8-Bit Family
Code (41h)
MSB LSB MSB LSB MSB LSB
Figure 6. 1-Wire CRC Generator
X 0 X 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8
Polynomial = X 8 + X 5 + X 4 + 1
1 st
STAGE
2 nd
STAGE
3 rd
STAGE
4 th
STAGE
6 th
STAGE
5 th
STAGE
7 th
STAGE
8 th
STAGE
INPUT DATA
Figure 7. DS2422 Memory Map
32-Byte Intermediate Storage Scratchpad
ADDRESS
0000H to
001FH
32-Byte General-Purpose SRAM (R/W) Page 0
0020H to
01FFH
General-Purpose SRAM (R/W)
Pages 1
to 15
0200H to
021FH
32-Byte Register Page 1 Page 16
0220H to
023FH
32-Byte Register Page 2 Page 17
0240H to
025FH
Calibration Memory Page 1 (R/W) Page 18
0260H to
027FH
Calibration Memory Page 2 (R/W) Page 19
0280H to
03FFH
(Reserved For Future Extensions) Pages 20 to 31
0400H to
041FH
Trim Register Page (R/W) Page 32
0420H to
0FFFH
(Reserved For Future Extensions) Pages 33 to 127
1000H to
2FFFH
Datalog Memory (Read-Only)
Pages 128
to 383