DragonFly On-Line Manual Pages

Search: Section:  

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)

OWFS Manpage                         2003                            DS2502(3)

Search: Section: