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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
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 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.
Copyright ? 2011–2014, Texas Instruments Incorporated
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