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NRF52820-QDAA-R Datasheet(PDF) 173 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 173 Page - Nordic Semiconductor |
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173 / 437 page  Peripherals Advertising channel PDU For advertising channel PDUs, the CTEInfo Flag replaces the CP bit. The CTEInfo Flag is within the extended header flag field in some of the advertising PDUs that employ the common extended advertising payload format (i.e. AUX_SYNC_IND, AUX_CHAIN_IND). The format of such packets is shown in the following figure. Length PDU Type ... 4 bits 8 bits 6 bits 4 bits S0 LENGTH PAYLOAD Extended Header Length AdvMode ... CTEInfo flag 2 bits 2 bits 1 bit 5 bits ... Extended Header Flags CTEInfo 8 bits ... ... CRC CTE AdvA TargetA 6 octets 6 octets Figure 63: Advertising channel PDU header The CTEINLINECONF.S0CONF and CTEINLINECONF.S0MASK fields can be configured to accept only certain advertising PDU Types. If the extended header length is non-zero, the CTEInfo extended header flag is checked to determine whether CTEInfo is present. If a bit before the CTEInfo flag within the extended header flags is set, then the CTEInfo position is postponed 6 octets. CTEInfo parsing The CTEInfo field is shown in the following figure. CTETime RFU CTEType 5 bits 1 bit 2 bits Figure 64: CTEInfo field The CTETIME field defines the length of the CTE in 8 µs units. The valid upper bound of values can be adjusted using CTEINLINECONF.CTETIMEVALIDRANGE, including allowing use of the RFU bit within this field. If the CTETIME field is an invalid value of either 0 or 1, the CTE is assumed to be the minimum valid length of 16 µs. The slot duration is determined by the CTEType field. In RX this determines whether the sample spacing as defined in CTEINLINECONF.CTEINLINERXMODE1US or CTEINLINECONF.CTEINLINERXMODE2US is used. CTEType Description TX switch spacing RX sample spacing during reference period Sample spacing RX during reference period 0 AoA, no switching - TSAMPLESPACING1 TSAMPLESPACING2 1 AoD, 1 µs slots 2 µs TSAMPLESPACING1 CTEINLINERXMODE1US 2 AoD, 2 µs slots 4 µs TSAMPLESPACING1 CTEINLINERXMODE2US 3 Reserved for future use Table 56: Switching and sampling spacing based on CTEType 6.12.12.4 Manual configuration If CTEINLINECONF.CTEINLINECTRLEN is not set, then the packet is not parsed to determine the CTE parameters, and the antenna switching and sampling is controlled by other registers, see Antenna switching on page 174. The length of the CTE is given in 8 µs units by DFECTRL1.NUMBEROF8US. The start of the antenna switching and/or sampling (denoted as an AoA/AoD procedure), can be configured to start at some trigger with an additional offset. Using DFECTRL1.DFEINEXTENSION, the trigger can be configured to be the end of the CRC, or alternatively, the ADDRESS event. The additional offset for antenna switching is configured using DFECTRL2.TSWITCHOFFSET. Similarly, the additional offset for antenna sampling is configured using DFECTRL2.TSAMPLEOFFSET. 4463_156 v1.0 173 |
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