Si4313-B1
6. Data Handling
6.1. RX FIFO
A 64 byte FIFO is integrated into the chip for RX, as shown below. "Register 7Fh. FIFO Access" is used to access
the FIFO. As described in "3.1. Serial Peripheral Interface" on page 17, a burst read from address 7Fh will read
data from the RX FIFO.
Figure 9. FIFO Threshold
The RX FIFO has one programmable threshold called the FIFO Almost Full Threshold, rxafthr[5:0]. When the
incoming RX data reaches the Almost Full Threshold, an interrupt will be generated to the microcontroller via the
nIRQ pin. The microcontroller will then need to read the data from the RX FIFO.
Add
R/W
Func/
D7
D6
D5
D4
D3
D2
D1
D0
POR
Description
Def
08
R/W
Operating & Func-
tion Control 2
Reserved Reserved Reserved
rxmpk
Reserved
enldm
ffclrrx
Reserved 00h
7E
R/W
RX FIFO Control
Reserved Reserved rxafthr[5]
rxafthr[4]
rxafthr[3]
rxafthr[2] rxafthr[1]
rxafthr[0]
37h
The RX FIFO pointers may be reset with the ffclrrx bit in "Register 08h. Operating Mode and Function Control 2".
The ffclrrx bit does not delete the data in the FIFO, it only resets the FIFO pointers. All interrupts may be enabled
by setting the Interrupt Enabled bits in "Register 05h. Interrupt Enable 1" and "Register 06h. Interrupt Enable 2,". If
the interrupts are not enabled, the function will not generate an interrupt on the nIRQ pin, but the bits will still be
read correctly in the Interrupt Status registers.
Rev. 1.0
29
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