Analog Devices ADSP-BF59x Blackfin, Hardware Reference Manual, Page: 566 / 772

SPORT Registers
14-60 ADSP-BF59x Blackfin Processor Hardware Reference
SPORT Status (SPORT_STAT) Register
The
SPORT_STAT
register is used to determine if the access to a SPORT RX
or TX FIFO can be made by determining their full or empty status. This
register is shown in
Figure 14-33 on page 14-61 .
The
TXF
bit in the
SPORT_STAT
register indicates whether there is room in
the TX FIFO. The
RXNE
status bit indicates whether there are words in the
RX FIFO. The
TXHRE
bit indicates if the TX hold register is empty.
The transmit underflow status bit (
TUVF
) is set whenever the
TFS
signal
occurs (from either an external or internal source) while the TX shift regis-
ter is empty. The internally generated
TFS
may be suppressed whenever
SPORT_TX
is empty by clearing the
DITFS
control bit in the
SPORT_TCR1
reg-
ister. The
TUVF
status bit is a sticky write-1-to-clear (W1C) bit and is also
cleared by disabling the SPORT (writing
TXEN
= 0).
For continuous transmission (
TFSR
= 0),
TUVF
is set at the end of a trans-
mitted word if no new word is available in the TX hold register.
The
TOVF
bit is set when a word is written to the TX FIFO when it is full.
It is a sticky W1C bit and is also cleared by writing
TXEN
= 0. Both
TXF
and
TOVF
are updated even when the SPORT is disabled.
Figure 14-32. SPORT Receive Data Register
S PORT Receive Data Register ( S PORT_RX)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Receive Data[ 3 1:16]
Reset = 0x0000 0000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Receive Data[15:0]