nRF24LE1 Nordic VLSI, nRF24LE1 Datasheet - Page 41

• Manufacturer Part Number: nRF24LE1
• Manufacturer: Nordic VLSI

nRF24LE1 Preliminary Product Specification
3.4.10.5
Figure 24.
on the PRX side is asserted. For the PTX both the TX_DS and RX_DR IRQ are asserted after the ACK
packet is received. After the second packet (PID=2) is received on the PRX side both the RX_DR (PID=2)
and TX_DS (ACK packet payload) IRQ are asserted.
3.4.10.6
In
the RX_DR IRQ is asserted immediately. The retransmission of the packet (PID=1) results in a discarded
packet. For the PTX both the TX_DS and RX_DR IRQ are asserted after the second transmission of ACK,
which is received. After the second packet (PID=2) is received on the PRX both the RX_DR (PID=2) and
TX_DS (ACK1PAY) IRQ is asserted. The callouts explains the different events and interrupts.
Revision 1.1
Figure 25.
Figure 25. TX/RX cycles with ACK Payload and the according interrupts when the ACK packet fails
PRX
MCU PRX
MCU PTX
PTX
1 Radio Turn Around Delay
2 Uploading Payload for Ack Packet
3 Delay defined by MCU on PTX side, ≥ 130us
PRX
MCU PRX
MCU PTX
PTX
1 Radio Turn Around Delay
2 Uploading Paylod for Ack Packet
3 Delay defined by MCU on PTX side, ≥ 130us
Figure 24. TX/RX cycles and the according interrupts when the packet transmission fails
is a scenario where the first packet is lost and a retransmission is needed before the RX_DR IRQ
Packet PID=1 lost
during transmission
the ACK packet is lost and a retransmission is needed before the TX_DS IRQ is asserted, but
UL1
Single transaction with ACK payload packet and lost packet
Two transactions with ACK payload packet and the first ACK packet lost
Packet received.
IRQ: RX DR (PID=1)
UL1
UL1
2
RX
TX:PID=1
No address detected.
RX off to save current
TX:PID=1
UL
130us
2
DL
No address detected.
RX off to save current
UL2
1
RX
ARD
ACK1 PAY
Auto retransmit delay
elapsed
ACK PID=1 lost
during transmission
130us
UL2
130us
UL2
1
2
RX
ARD
1
RX
Auto retransmit delay
elapsed
Retransmit of packet
PID=1
TX:PID=1
Packet detected as
copy of previous,
discarded
RX
130us
41 of 191
Packet received.
IRQ: RX DR (PID=1)
1
130us
UL3
ACK received
IRQ: TX DS (PID=1)
1
Retransmit of packet
PID=1
RX DR (ACK1PAY)
ACK1 PAY
TX:PID=1
RX
≥
130us
IRQ
DL
Packet received.
IRQ: RX DR (PID=2)
3
TX DS (ACK1PAY)
130us
DL
ACK received
IRQ: TX DS (PID=1)
TX:PID=2
1
RX
RX DR (ACK1PAY)
ACK1 PAY
RX
130us
≥
IRQ
DL
ACK received
IRQ: TX DS (PID=2)
130us
IRQ
DL
1
RX DR (ACK2PAY)
ACK2 PAY
Packet received.
IRQ: RX DR (PID=2)
3
RX
TX DS (ACK1PAY)
≥
130us
TX:PID=2
Packet received.
IRQ: RX DR (PID=3)
RX
3
TX DS (ACK2PAY)
TX:PID=3
RX
DL