DS2432 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated
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DS2432 Datasheet PDF : 30 Pages
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PRELIMINARY
1-WIRE CRC GENERATOR Figure 4
Polynomial = X8 + X5 + X4 + 1
DS2432
1st
2nd
3rd
4th
STAGE STAGE STAGE STAGE
X0
X1
X2
X3
5th
STAGE
X4
6th
7th
8th
STAGE STAGE STAGE
X5
X6
X7
X8
INPUT DATA
MEMORY MAP
The DS2432 has four memory areas: data memory, secrets memory, register page with special function
registers and user-bytes, and a scratchpad. The data memory is organized in pages of 32 bytes. Secret,
register page and scratchpad are 8 bytes each. The scratchpad acts as a buffer when writing to the data
memory, loading the initial secret or when writing to the register page.
Data memory, secrets memory and register page are located in a linear address space, as shown in
Figure 5. The data memory and the register page have unrestricted read access. Writing to the data
memory and the register page requires the knowledge of the secret.
DS2432 MEMORY MAP Figure 5
Address Range
0000h to 001Fh
0020h to 003Fh
0040h to 005Fh
0060h to 007Fh
0080h to 0087h
0088h 1)
0089h 1)
008Ah 1)
008Bh
008Ch 1)
008Dh 1)
008Eh to 008Fh
0090h to 0097h
Description
Data Memory Page 0
Data Memory Page 1
Data Memory Page 2
Data Memory Page 3
Secrets Memory
Write-protect secret, 008Ch to 008Fh
Write-protect pages 0 to 3
User byte, self-protecting
Factory byte (read only)
User byte/EPROM mode control for page 1
User byte/Write-protect page 0 only
User Bytes/Manufacturer ID
64-Bit Registration Number
Note
No write-access without secret
No write-access without secret
No write-access without secret
No write-access without secret
No read access; no secret for write access
Protection activated by code AAh or 55h
Protection activated by code AAh or 55h
Protection activated by code AAh or 55h
Reads either AAh or 55h; see text
Mode activated by code AAh or 55h
Protection activated by code AAh or 55h
Function depends on factory byte
(Alternate readout)
1) Once programmed to AAh or 55h this address becomes read-only. All other codes can be stored but
will neither write-protect the address nor activate any function.
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