Serial Control Signal (Sc1) - Freescale Semiconductor DSP56311 User Manual

Enhanced Synchronous Serial Interface (ESSI)
output. If is used as the serial Output Flag 0, its value is determined by the value of the serial
SC0
Output Flag 0 (OF0) bit in the CRB. If
a receive shift register clock input. As serial Input Flag 0,
Flag 0 (IF0) bit in the ESSI Status Register (SSISR).
When is configured as a transmit data signal, it is always an output signal, regardless of the
SC0
SCD0 bit value. is fully synchronized with the other transmit data signals (
SC0
can be programmed as a GPIO signal (
Note: The ESSI can operate with more than one active transmitter only in Synchronous
mode.

7.2.5 Serial Control Signal (SC1)

ESSI0:SC01; ESSI1: SCI11
To determine the function of
Table 7-2. In Asynchronous mode (as for a single codec with asynchronous transmit and
receive), is the receiver frame sync I/O. In Synchronous mode,
SC1
signal of transmit shift register TX2, for the transmitter 0 drive-enabled signal, or for serial flag
I/O. As serial flag I/O,
together for multiple serial device selection; they can be unencoded to select up to two CODECs
or decoded externally to select up to four CODECs. If
frame sync signal, the Serial Control Direction 1 CRB[SCD1] bit determines its direction.
Control Bits
SYN TE0 TE1
0 0 X
0 0 X
0 1 X
0 1 X
1 0 0
1 0 0
1 0 0
1 0 0
1 0 1
1 0 1
1 0 1
1 0 1
1 1 0
7-4
is an input, it functions as either serial Input Flag 0 or
SC0
) when the ESSI
P0
, select either Synchronous or Asynchronous mode, according to
SC1
operates like
SC1 SC0
Table 7-2. Mode and Signal Definitions
TE2 RE SC0
X 0 U
X 1 RXC
X 0 U
X 1 RXC
0 0 U
0 1 F0/U
1 0 F0/U
1 1 F0/U
0 0 TD1
0 1 TD1
1 0 TD1
1 1 TD1
0 0 F0/U
DSP56311 User's Manual, Rev. 2
controls the state of the serial Input
SC0
function is not in use.
SC0
. and SC1are independent flags but can be used
SC0
is configured as a serial flag or receive
SC1
ESSI Signals
SC1 SC2
U
FSR
U FST
FSR FST
U
F1/T0D/U
TD2
TD2
F1/T0D/U
F1/T0D/U
TD2
TD2
F1/T0D/U
and
STD
is the transmitter data out
SC1
SCK STD
U U U
U U U
TXC TD0
TXC TD0
U U U
FS XC U
FS XC U
FS XC U
FS XC U
FS XC U
FS XC U
FS XC U
FS XC TD0
Freescale Semiconductor
).
SC1 SC0
SRD
U
RD
U
RD
U
RD
U
RD
U
RD
U
RD
U