tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 84
tda5235
Manufacturer Part Number
tda5235
Description
Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
Manufacturer
Infineon Technologies Corporation
Datasheet
1.TDA5235.pdf
(259 pages)
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FIFO Status Word
The FIFO Status Word is attached at the end of a FIFO SPI transmission, and shows if
there was an overflow, and how many valid data bits were transmitted. The number of
valid FIFO bits is indicated at bit positions S0 to S5. S6 of the Status Word is always
undefined.
Figure 55
If the Write Address Pointer outruns the Read Address Pointer, an overflow is indicated
in the FIFO Overflow Status bit in the FIFO Read Status Word at position S7. All 32 FIFO
bits and the bits S5 to S0 of the Status Word are undefined while the Overflow Status bit
is set.
If a TSI is detected after an overflow, the FIFO Overflow Status bit is cleared and the
entire receive FIFO is initialized.
Initialization
Additionally, there are two possibilities to initialize the receive FIFO.
•
•
Last received message length
For application protocols with several payload frames and only a short pause in-
between, the microcontroller would have to read out the FIFO very fast after detection of
an EOM. Thus even slow or overloaded Application Controllers have the possibility now
to determine the end of the last message, when reading out the FIFO, while the next
payload frame gets already received and payload data is further stored in the FIFO.
Data Sheet
SDO
SDI
If the INITFIFO bit is set in the CMC1 register (“Init FIFO at Cycle Start”) the entire
receive FIFO is always initialized
If the FSINITFIFO bit in CMC1 register is set, the entire receive FIFO is initialized
when a TSI is detected and the receive FIFO is not locked (“Init FIFO at Frame
Start”).
a.) after switching to Run Mode Slave or
b.) switching from Self Polling Mode to Run Mode Self Polling.
high impedance Z
SPI Data FIFO Read
I7
I6
I1
I0
D0
D1
32 FIFO Bits
84
D30 D31
S7
S6
Status Word
Functional Description
S1
V1.0, 2010-02-19
S0
TDA5235
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