nRF24LE1 Nordic VLSI, nRF24LE1 Datasheet - Page 40

• Manufacturer Part Number: nRF24LE1
• Manufacturer: Nordic VLSI

nRF24LE1 Preliminary Product Specification
When an address is detected the PTX stays in RX mode until the packet is received. When the retransmit-
ted packet is received by the PRX (see
back to the PTX. When the ACK is received by the PTX, the TX_DS IRQ is asserted.
3.4.10.3
Figure 22.
ing interrupts are also indicated.
3.4.10.4
Figure 23.
the PTX and received by the PRX the ACK packet with payload is transmitted from the PRX to the PTX.
The RX_DR IRQ is asserted after the packet is received by the PRX, whereas on the PTX side the TX_DS
IRQ is asserted when the ACK packet is received by the PTX. On the PRX side, the TX_DS IRQ for the
ACK packet payload is asserted after a new packet from PTX is received. The position of the IRQ in
23.
Revision 1.1
shows where the MCU can respond to the interrupt.
Figure 22. TX/RX cycles with ACK and the according interrupts when the ACK packet fails
is a scenario of the basic auto acknowledgement with payload. After the packet is transmitted by
is a scenario where a retransmission is needed after a loss of the ACK packet. The correspond-
PRX
Single transaction with a lost ACK packet
MCU PRX
Single transaction with ACK payload packet
MCU PTX
PTX
1 Radio Turn Around Delay
Figure 23. TX/RX cycles with ACK Payload and the according interrupts
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
UL
Packet received.
IRQ: RX DR (PID=1)
UL1
RX
TX:PID=1
Packet received.
IRQ: RX DR (PID=1)
UL
2
No address detected.
RX off to save current
RX
TX:PID=1
Figure
ACK received
IRQ: TX DS (PID=1)
RX DR (ACK1PAY)
130us
DL
21.), the RX_DR IRQ is asserted and an ACK is transmitted
1
RX
130us
ARD
40 of 191
ACK:PID=1
Auto retransmit delay
elapsed
DL
UL2
ACK PID=1 lost
during transmission
1
ACK1 PAY
RX
130us
≥
1
130us
IRQ
DL
Packet received.
IRQ: RX DR (PID=2)
Retransmit of packet
PID=1
3
Packet detected as
copy of previous,
discarded
TX:PID=1
TX DS (ACK1PAY)
RX
Transmit of packet
PID=2
TX:PID=2
RX
130us
ACK received
IRQ: TX DS (PID=1)
1
ACK:PID=1
IRQ
DL
RX
IRQ
Figure