LRI512 datasheet(40/54 Pages) STMICROELECTRONICS

Part #	LRI512

Description	Memory TAG IC 512 bit High Endurance EEPROM 13.56MHz, ISO 15693 Standard Compliant with E.A.S.

PDF	54 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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40 / 54 page

LRI512

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APPENDIX A

The following pseudo-code describes how the

anti-collision could be implemented on the VCD,

using recursive functions.

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(LRI512_UID)

; stores LRI512_UID

function poll_loop (sub_address_size as integer)

pop (mask, address)

mask = address & mask

; generates new mask

; send the Request

mode = anti-collision

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

; LRI512 is inventoried

then

store (LRI512_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

LRI512 Datasheet(PDF) 40 Page - STMicroelectronics

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