LRI2K datasheet(84/89 Pages) STMICROELECTRONICS

No de pièce	LRI2K

Description	2048-bit EEPROM tag IC at 13.56 MHz, with 64-bit UID and kill code, ISO 15693 and ISO 18000-3 Mode 1 compliant

PDF	89 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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Anticollision algorithm (Informative)

LRI2K

84/89

Appendix A

Anticollision algorithm (Informative)

The following pseudocode describes how anticollision could be implemented on the VCD,

using recursivity.

A.1

Algorithm for pulsed slots

function push (mask, address); pushes on private stack

function pop (mask, address); pops from private stack

function pulse_next_pause; generates a power pulse

function store(

LRI2K_UID); stores LRI2K_UID

function poll_loop (sub_address_size as integer)

pop (mask, address)

mask = address & mask; generates new mask

; send the request

mode = anticollision

send_request (Request_cmd, mode, mask length, mask value)

for sub_address = 0 to (2^sub_address_size - 1)

pulse_next_pause

if no_collision_is_detected ;

LRI2K is inventoried

then

store (LRI2K_UID)

else ; remember a collision was detected

push(mask,address)

endif

next sub_address

if stack_not_empty ; if some collisions have been detected and

then

; not yet processed, the function calls itself

poll_loop (sub_address_size); recursively to process the

last stored collision

endif

end poll_loop

main_cycle:

mask = null

address = null

push (mask, address)

poll_loop(sub_address_size)

end_main_cycle

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