| DS2502(3) | One-Wire File System | DS2502(3) |
NAME
DS2502 - Add-Only Memory (1 kBit)
- DS2502-E48, DS2502-UNW
- - 48-bit Node Address Chip, UniqueWare Add-Only Memory (1 kBit)
- DS1982, DS1982U
- - Add-Only iButton (1 kBit), UniqueWare iButton (1 kBit)
SYNOPSIS
EPROM add-only memory.
09 [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-3|ALL] |
See the file man3/standard_mini.3so.
]]
89 [.]XXXXXXXXXXXX[XX][/[ mac_e | mac_fw | memory | pages/page.[0-3|ALL] | project |
See the file man3/standard_mini.3so.
]]
FAMILY CODE
- 09
- DS2502 DS1982
- 89
- DS2502-UNW DS2502-E48 DS1982U
SPECIAL PROPERTIES
mac_e mac_fw
read-only, binary
64 bit or 80 bit media access control number. Unique, and unrelated to
the 1-wire address. It is apparently used for ethernet or FireWire
addressing, respectively.
memory
read-write, binary
128 bytes of memory. Initially all bits are set to 1. Writing zero permanently
alters the memory.
pages/page.0 ... pages/page.3 pages/page.ALL
read-write, yes-no
Memory is split into 4 pages of 32 bytes each. ALL is an aggregate of
the pages. Each page is accessed sequentially.
project
read-only, binary
32 bit project id. Constant 0x0000 for ethernet and 0x00001128 for
firewire. See Datasheets.
STANDARD PROPERTIES
See the file man3/standard.3so.
ALARMS
None.
DESCRIPTION
See the file man3/description.3so.
DS2502 DS1982
The DS2502 (3) is used for write-once incremental storage. It's main advantage is for audit trails (i.e. a digital purse).
The DS2502-E48 and DS2502-UNW are some of the UniqueWare class of devices. Some of the memory was preprogramed at the factory. See the datasheet for specifics. The DS2502 , DS2505 , and DS2506 differ in their function by the amount of on-board memory they possess. (The internal protocols are slightly different, but the OWFS system handles this automatically.
ADDRESSING
See the file man3/addressing.3so.
DATASHEET
http://pdfserv.maxim-ic.com/en/ds/DS2502.pdf
http://pdfserv.maxim-ic.com/en/ds/DS2502-E48.pdf
http://pdfserv.maxim-ic.com/en/ds/DS2502-UNW-DS2506S-UNW.pdf
http://pdfserv.maxim-ic.com/en/ds/DS1982-F3-DS1982-F5.pdf
http://pdfserv.maxim-ic.com/en/ds/DS1982U-DS1986U.pdf
SEE ALSO
See the file man3/seealso.3so.
AVAILABILITY
http://www.owfs.org
AUTHOR
Paul Alfille (paul.alfille@gmail.com)
| 2003 | OWFS Manpage |