NXP Semiconductors PN544 C2 - Page 134

NXP Semiconductors
UM191812
PN544 C2 User Manual
191812 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
User Manual Rev. 1.2 — 2010-06-16 134 of 172
EVT_TARGET_DISCOVERED
parameter STATUS=’03' (collision)
DESELECT
Polling Loop
Gate
External ISO14443A
card in the field
NXP_WR_ACTIVATE_NEXT
Type A RF
Reader Gate
Type A
Reader Gate
DESELECT response
REQA
ATQA
ANY_OK
(containing R-APDU)
EVT_END_OPERATION*
* It stops the exchanges with the card, and also the READER_REQUESTED (all
tecnologies types)
Only a reader phase is shown here
NXP_PL_RDPHASES
to allow Reader type A
PN544
HOST
Send the data in
ISO14443-4 protocol
Receive the data in
ISO14443-4 protocol
Type A
Reader Gate
Type A RF
Reader Gate
External ISO14443A
card in the field
ATQA
SDD
SELECT
SELECT response
RATS
ATS
REQA
ATQA
SDD
SELECT
SELECT response
RATS
ATS
NXP_WR_ACTIVATE_NEXT Response
parameter STATUS=’00' (no collision)
WR_XCHG_DATA
(containing C-APDU)
Type A RF
Reader Gate
Type A
Reader Gate
In this example, the host decides to look for the second
card and to exchange data with the second card.
The Type A reader RF gate
registry is updated after card
activation (as defined in HCI
specification). The host can read
it (using GET_PARAMETER)
The Type A reader RF gate
registry is updated after card
activation (as defined in HCI
specification). The host can read
it (using GET_PARAMETER)
Polling Loop
Gate
Fig 69. Host as a Type A reader, two Type A cards in the field.
Several cards can be put in HALT. The parameter of EVT_TARGET_DISCOVERED
indicates if there is still a collision (i.e. if there are still several cards not activated).