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SL3S1205FUD2/HAP Datasheet(PDF) 27 Page - NXP Semiconductors |
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SL3S1205FUD2/HAP Datasheet(HTML) 27 Page - NXP Semiconductors |
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27 / 38 page  NXP Semiconductors SL3S1205_15 UCODE 8/8m 9.6.11 Custom commands The Untraceable function allows the UCODE 8/8m to hide the complete or parts of the EPC, TID and/or user memory. In addition, the read range can be completely or temporarily reduced. This command can only be executed from the secured state. Memory parts which are set untraceable are acting as non-existing in the Open state. EPC-field: Specifies the number of words of the EPC memory which the UCODE 8/8m back scatters. A change of this field therefore also changes the L bit in the Protocol Control (PC) word. TID-field: Hide some ("01") hides the TID memory from address 20h (included) onwards. Range-field: In case of activated range toggling, the read range reduction toggles from the actual value to the second (e.g. when actual state is normal it toggles to reduced). In case of power loss the chip reverts to its prior state. UCODE 8/8m does not support the U bit and therefore ignores this value. Command RFU U EPC TID User Range RN CRC No. of bits 16 2 1 6 2 1 2 16 16 Description 1110 0010 0000 0000 00 do not care MSB:"0": show memory above EPC "1": hide memory above EPC 5 LSBs: new EPC length "00": hide none "01": hide some "10": hide all "11": RFU "0": view "1": hide "00": normal "01": toggle "10": reduced "11": RFU handle CRC-16 Table 12. Untraceable command Starting State Condition Response Next State ready all - ready arbitrate, reply, acknowledged all - arbitrate open all - open secured executable backscatter header when done secured killed all - killed Table 13. Untraceable command-response table In case of access to the memory that is set to untraceable, the error condition "memory overrun" is returned. For further details, refer to "EPC Global Gen2v2" SL3S1205_15 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 3.5 — 1 April 2021 COMPANY PUBLIC 398435 27 / 38 |
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