NXP Semiconductors PN544 C2 - Page 119

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 — 2010-06-16 119 of 172
External NFC-IP1
Target
Send the data in
NFC-IP1 protocol
Receive the data in
NFC-IP1 protocol
PN544
HOST
NFC-IP1
Initiator
Gate
PN544 Initialization
NFC-IP1 Initialization & activation performed
NFC-IP1 Initiator
NFC-IP1
Initiator
Gate
NFC-IP1
Initiator
Gate
NXP_EVT_NFC_SND_DATA (MI=1)
NFC-IP1
Initiator
Gate
NXP_EVT_NFC_CONTINUE_MI
NXP_EVT_NFC_RCV_DATA
NFC-IP1
Initiator
Gate
NFC-IP1
Initiator
Gate
Send the data in
NFC-IP1 protocol
NFC-IP1
Initiator
Gate
NFC-IP1
Initiator
Gate
NXP_EVT_NFC_SND_DATA (MI=0)
Fig 64. NFC-IP1 Initiator exchange using NXP_EVT_NFC_CONTINUE_MI
Note: When using the MI chaining information of the NXP_EVT_NFC_SND_DATA event,
the host must insure that the size of data transmitted within this message is lower than
the ‘maximum frame length’ supported (can be retrieved in NXP_NFCI_PARAM).
The proprietary ‘NFCIP1 Initiator’ gate has the following command and registry:
Table 118. NFC-IP1 Initiator Command
Value Command Description
’12’
NXP_NFCI_ATTREQUEST
The host sends this command to check
the target is still present in the field (see
[4] §12.6.3 - Attention – Target present).
The re
sponse to this command indicates
the result of the Attention procedure.