Texas Instruments TRF7970A Manual page 37

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CLK
I/O_[7]
I/O_[6:0]
Figure 6-15. Parallel Interface Communication With Continuous Stop Condition (StopCont)
Figure 6-16. Example of Parallel Interface Communication With Continuous Stop Condition
6.10.3 Reception of Air Interface Data
At the start of a receive operation (when SOF is successfully detected), B6 is set in the IRQ Status
register. An RX complete interrupt request is sent to the MCU at the end of the receive operation if the
receive data string is shorter than or equal to the number of bytes configured in the Adjustable FIFO IRQ
Levels register (0x14). An IRQ_FIFO interrupt request is sent to the MCU during the receive operation if
the data string is greater than the level set in the Adjustable FIFO IRQ Levels register (0x14). After
receiving an IRQ_FIFO or RX complete interrupt, the MCU must read the FIFO Status register (0x1C) to
determine the number of bytes to be read from the FIFO. Next, the MCU must read the data in the FIFO.
It is optional but recommended to read the FIFO Status register (0x1C) after reading FIFO data to
determine if the receive is complete. In the case of an IRQ_FIFO, the MCU should expect either another
IRQ_FIFO or RX complete interrupt. This is repeated until an RX complete interrupt is generated. The
MCU receives the interrupt request, then checks to determine the reason for the interrupt by reading the
IRQ Status register (0x0C), after which the MCU reads the data from the FIFO.
If the reader detects a receive error, the corresponding error flag is set (framing error, CRC error) in the
IRQ Status register, indicating to the MCU that reception was not completed correctly.
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Start
Condition
50 ns
a0 [7] d0 [7] d1 [7]
xx a0 [6:0] d0 [6:0] d1 [6:0]
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SLOS743L – AUGUST 2011 – REVISED MARCH 2017
d2 [7] d3 [7] dN [7]
d2 [6:0] d3 [6:0] dN [6:0]
TRF7970A
TRF7970A
StopCont
Continuous Mode
xx
Detailed Description 37