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Enhanced Synchronous Serial Interface (ESSI)
output. If SC0 is used as the serial Output Flag 0, its value is determined by the value of the serial
Output Flag 0 (OF0) bit in the CRB. If SC0 is an input, it functions as either serial Input Flag 0 or
a receive shift register clock input. As serial Input Flag 0, SC0 controls the state of the serial Input
Flag 0 (IF0) bit in the ESSI Status Register (SSISR).
When SC0 is configured as a transmit data signal, it is always an output signal, regardless of the
SCD0 bit value. SC0 is fully synchronized with the other transmit data signals ( STD and SC1 ). SC0
can be programmed as a GPIO signal ( P0 ) when the ESSI SC0 function is not in use.
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 SC1 , select either Synchronous or Asynchronous mode, according to
Table 7-2 . In Asynchronous mode (as for a single codec with asynchronous transmit and
receive), SC1 is the receiver frame sync I/O. In Synchronous mode, SC1 is the transmitter data out
signal of transmit shift register TX2, for the transmitter 0 drive-enabled signal, or for serial flag
I/O. As serial flag I/O, SC1 operates like SC0 . SC0 and SC1are independent flags but can be used
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 SC1 is configured as a serial flag or receive
frame sync signal, the Serial Control Direction 1 CRB[SCD1] bit determines its direction.
Table 7-2. Mode and Signal Definitions
Control Bits
ESSI Signals
SYN
0
0
0
0
1
1
1
1
1
1
1
1
1
TE0
0
0
1
1
0
0
0
0
0
0
0
0
1
TE1
X
X
X
X
0
0
0
0
1
1
1
1
0
TE2
X
X
X
X
0
0
1
1
0
0
1
1
0
RE
0
1
0
1
0
1
0
1
0
1
0
1
0
SC0
U
RXC
U
RXC
U
F0/U
F0/U
F0/U
TD1
TD1
TD1
TD1
F0/U
SC1
U
FSR
U
FSR
U
F1/T0D/U
TD2
TD2
F1/T0D/U
F1/T0D/U
TD2
TD2
F1/T0D/U
SC2
U
U
FST
FST
U
FS
FS
FS
FS
FS
FS
FS
FS
SCK
U
U
TXC
TXC
U
XC
XC
XC
XC
XC
XC
XC
XC
STD
U
U
TD0
TD0
U
U
U
U
U
U
U
U
TD0
SRD
U
RD
U
RD
U
RD
U
RD
U
RD
U
RD
U
DSP56311 User’s Manual, Rev. 2
7-4
Freescale Semiconductor
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