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NXP Semiconductors
12.8 Adaptive Waveform Control (AWC)
Depending on the level of detected detuning of the antenna, RF wave shaping related
register settings can be automatically updated. The shaping related register settings are
stored in a lookup table located in EEPROM, and selected dependent on the actual gear.
The gear numbers need to be provided as part of the lookup table entries and need to be
provided in ascending order in the EEPROM. Each lookup table entry allows to configure
not only a dedicated wave shaping configuration for the corresponding gear, but in
additionally it is possible to configure for this gear the wave shaping configuration
dependent on the different protocols.
Each lookup table item contains a bitmask of technology and baud rate (in order to use
an entry for multiple technologies and baud rates), the DPC Gear and a relative value
(change compared to actual setting of register
CLIF_ANA_TX_SHAPE_CONTROL_REG) for TX_SET_TAU_MOD_FALLING,
TX_SET_TAU_MOD_RISING and TX_RESIDUAL_CARRIER.
Table 244. PCD Shaping entry definition
Each entry contains 32 bit.
bit #
31 ... 29
28
27
26
25
24
23
22
21
20
19
18
17
16
15 ...12
11 ... 8
7 ... 4
3 ... 0
In case of a gear switch, a EEPROM lookup is performed if the current gear (at current
protocol and baud rate) has an assigned wave shaping configuration. In case of an
execution of a LoadProtocol command, this lookup will be performed (example: switching
from baud rate A106 to A424) as well. The change from the wave shaping configuration
as configured by phhalRf_LoadProtocol is relative, which means that bits are added or
UM10858
User manual
COMPANY PUBLIC
Definition
RFU, don't use.
180003m3
15693 @ASK100%
15693 @ASK10%
NFC type F @424
NFC type F @212
14443 type B @848
14443 type B @424
14443 type B @212
14443 type B @106
14443 type A @848
14443 type A @424
14443 type A @212
14443 type A @106
Residual carrier
TAU_MOD_RISING
TAU_MOD_FALLING
Gear number
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
314514
PN7462 family HW user manual
Must be 0.
Enabling a protocol enables the defined PCD shaping
setting changes, as defined in bit 15 ... 4 for the defined
gear as defined in bit 3 ... 0.
One or more protocols can be enabled.
Sign bit + 3 bit value
Sign bit + 3 bit value
Sign bit + 3 bit value
Gear number 1 ... 14
UM10858
© NXP B.V. 2018. All rights reserved.
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