Data Sheet

Revision 2.0 Page 28 of 74

nRF24L01 Product Specification

With static packet length the Enhanced ShockBurst™ will capture the packet according to the length given

by the RX_PW register. With DPL Enhanced ShockBurst™ captures the packet according to the payload

lenght field in the packet control field. After capturing the packet Enhanced ShockBurst™ will perform

CRC.

If the CRC is valid, Enhanced ShockBurst™ will check PID. The received PID is compared with the previ-

ous received PID. If the PID fields are different, the packet is considered new. If the PID fields are equal the

receiver must check if the received CRC is equal to the previous CRC. If the CRCs are equal, the packet is

defined as equal to the previous packet and is discarded. Refer to the right flow chart in Figure 6. on page

Figure 6. PID generation/detection

7.4.4 Automatic packet disassembly

After the packet is validated,Enhanched ShockBurst™ disassembles the packet and loads the payload into

the RX FIFO, and assert the RX_DR IRQ

7.5 Automatic packet transaction handling

Enhanced ShockBurst™ features two functions for automatic packet transaction handling; auto acknowl-

edgement and auto re-transmit.

Start

New packet

from MCU?

Yes

increment PID

End

Start

PID equal

last PID?

Yes

CRC equal

last CRC?

New packet is

valid for MCU

End

Discard packet

as a copy

Yes

PTX side functionality PRX side functionality