Enhanced Serial Audio Interface (ESAI)
ESAI Data and Control Pins
MOTOROLA
DSP56367
10-7
or by all the enabled transmitters and receivers in the synchronous mode (SYN=1) (see
Table 10-2).
SCKT may be programmed as a general-purpose I/O pin (PC3) when the ESAI SCKT
function is not being used.
Note:
Although the external ESAI serial clock can be independent of and asynchronous
to the DSP system clock, the DSP clock frequency must be at least three times the
external ESAI serial clock frequency and each ESAI serial clock phase must
exceed the minimum of 1.5 DSP clock periods.
10.2.9
FRAME SYNC FOR RECEIVER (FSR)
FSR is a bidirectional pin providing the receivers frame sync signal for the ESAI interface.
The direction of this pin is determined by the RFSD bit in RCR register. In the asynchronous
mode (SYN=0), the FSR pin operates as the frame sync input or output used by all the enabled
receivers. In the synchronous mode (SYN=1), it operates as either the serial flag 1 pin
(TEBE=0), or as the transmitter external buffer enable control (TEBE=1, RFSD=1). For
further information on pin mode and definition, see Table 10-8 and on receiver clock signals
see Table 10-1.
When this pin is configured as serial flag pin, its direction is determined by the RFSD bit in
the RCCR register. When configured as the output flag OF1, this pin reflects the value of the
OF1 bit in the SAICR register, and the data in the OF1 bit shows up at the pin synchronized to
the frame sync being used by the transmitter and receiver sections. When configured as the
Table 10-2 Transmitter Clock Sources
THCKD
TFSD
TCKD
Transmitter
Bit Clock Source
OUTPUTS
0
0
0
SCKT
0
0
1
HCKT
SCKT
0
1
0
SCKT
FST
0
1
1
HCKT
FST
SCKT
1
0
0
SCKT
HCKT
1
0
1
INT
HCKT
SCKT
1
1
0
SCKT
HCKT
FST
1
1
1
INT
HCKT
FST
SCKT
Summary of Contents for DSP56367
Page 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Page 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Page 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Page 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Page 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Page 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Page 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Page 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Page 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Page 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Page 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Page 522: ...Index 6 MOTOROLA Index ...
Page 523: ......