Frame Sync Options - Analog Devices ADSP-BF59x Blackfin Hardware Reference Manual

Functional Description

Frame Sync Options

Framing signals indicate the beginning of each serial word transfer. The
framing signals for each SPORT are
(receive frame sync). A variety of framing options are available; these
options are configured in the SPORT configuration registers (
,
SPORT_TCR2 SPORT_RCR1
SPORT are independent and are separately configured in the control
registers.
Framed Versus Unframed
The use of multiple frame sync signals is optional in SPORT communica-
tions. The
TFSR
frame sync required select) control bits determine whether frame sync sig-
nals are required. These bits are located in the
registers.
When = 1 or
TFSR
word. To allow continuous transmitting by the SPORT, each new data
word must be loaded into the
word is shifted out and transmitted.
When = 0 or
TFSR
required. A single frame sync is needed to initiate communications but is
ignored after the first bit is transferred. Data words are then transferred
continuously, unframed.

With frame syncs not required, interrupt or DMA requests may
not be serviced frequently enough to guarantee continuous
unframed data flow. Monitor status bits or check for a SPORT
Error interrupt to detect underflow or overflow of data.
14-30
and
SPORT_RCR2
(transmit frame sync required select) and
= 1, a frame sync signal is required for every data
RFSR
SPORT_TX
= 0, the corresponding frame sync signal is not
RFSR
ADSP-BF59x Blackfin Processor Hardware Reference
(transmit frame sync) and
TFS
). The and
TFS
SPORT_TCR1
hold register before the previous
RFS
,
SPORT_TCR1
signals of a
RFS
(receive
RFSR
and
SPORT_RCR1