Mask Designer ID Assignment (MDID)
An EPC Global Tag Identification memory bank shall contain an 8 bit ISO/IEC 15963 allocation class identifier of E2h at memory locations 00h to 07h for EPC Global Applications. TID memory locations 08h to 13h contain a 12 bit Tag mask designer identifier (MDID) obtainable from EPCGlobal. EPCGlobal will assign two MDIDs to each mask designer, one with bit 08h set to one and one with it set to zero. Readers that are not configured to handle the extended TID will treat both of these numbers as a 12 bit MDID. Readers that are configured to handle the extended TID will recognize the TID memory location 08h as the Extended Tag Identification bit. The value of this bit indicates the format of the rest of the TID. A value of zero indicates a short TID in which the values beyond address 1Fh are not defined. A value of one indicates an Extended Tag Identification (XTID) in which the values beyond 1Fh contain additional data as specified here. Tag manufacturers should write permalock the fields in both the short and extended TIDs at the time of manufacture.
Last updated on 22nd April 2012
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