© 1996-2005 RF IDeas, Inc. All rights reserved
iCLASS Read/Write Memory
The read/write memory for the iCLASS cards is accessible by using a key you place in one of the
reader’s 7 key storage memory areas. The key you reference in the reader must agree with the key
already in the card in order for access to be granted. If the two keys (card and reader) do not agree,
access is denied.
iCLASS Page 0 Memory Map
Blocks (8 bytes each) 0 through 5 in each page contain various configuration information. Users should
not write to this area as you may render the card useless. Key 1 and Key 2 located in blocks 3 and 4 are
used to access what is known as Application Area 1 and Application Area2 for the given page.
Reserved Area HID Access Control Application
Page 0 is a special area of memory for the programmed iCLASS cards. As can be seen above,
Application Area 1 is essentially reserved for HID Access Control Application (i.e. proximity card
Wiegand data such as parity, site codes, and employee identification numbers).
The building access control industry is an important need being served by the iCLASS cards and
readers. A single badge solution for building and computer access is one of the fundamental benefits of
contactless smart cards. To better understand how the building access using this reserved area as well
as the terms and nomenclature associated with building access, we have included the
pcProx
reader
documentation. You will find that the concepts and terms associated with proximity cards are very
similar to those used with the read-only data stored in this reserved area. This is allow end users to
seamlessly integrate iCLASS technology, in a plug and play fashion, into their building access control
equipment.
