Enhanced Synchronous Serial Interface 1 (Essi1) - Motorola DSP56303 User Manual

2.9

Enhanced Synchronous Serial Interface 1 (ESSI1)

Table 2-13. Enhanced Synchronous Serial Interface 1 (ESSI1)
Signal
Type
Name
SC10 Input or
Output
PD0
SC11 Input/Output
PD1 Input or
Output
SC12 Input/Output
PD2 Input or
Output
1
State During
Reset Stop
Input Disconnected
internally
Input Disconnected
internally
Input Disconnected
internally
Signals/Connections

Enhanced Synchronous Serial Interface 1 (ESSI1)

Signal Description
Serial Control 0—Functions in either Synchronous or
Asynchronous mode. For Asynchronous mode, this signal is
the receive clock I/O (Schmitt-trigger input). For Synchronous
mode, this signal is either for Transmitter 1 output or Serial I/O
Flag 0.
Port D 0—The default configuration following reset is GPIO.
For PD0, signal direction is controlled through the Port D
Direction Register (PRRD).
This signal is configured as SC10 or PD0 through the Port D
Control Register (PCRD).
This input is 5 V tolerant.
Serial Control 1—Functions in either Synchronous or
Asynchronous mode. For Asynchronous mode, this signal is
the receiver frame sync I/O. For Synchronous mode, this signal
is either Transmitter 2 output or Serial I/O Flag 1.
Port D 1—The default configuration following reset is GPIO.
For PD1, signal direction is controlled through PRRD.
This signal is configured as SC11 or PD1 through PCRD.
This input is 5 V tolerant.
Serial Control Signal 2—The frame sync for both the
transmitter and receiver in Synchronous mode, and for the
transmitter only in Asynchronous mode. When configured as
an output, this signal is the internally generated frame sync
signal. When configured as an input, this signal receives an
external frame sync signal for the transmitter (and the receiver
in synchronous operation).
Port D 2—The default configuration following reset is GPIO.
For PD2, signal direction is controlled through PRRD.
This signal is configured as SC12 or PD2 through PCRD.
This input is 5 V tolerant.
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