12-4
DSP56367
MOTOROLA
Digital Audio Transmitter
DAX Programming Model
biphase encoder to the ADO pin at the last two time slots. This is the end of the first (channel
A) subframe transmission.
The second subframe transmission (channel B) starts with the preamble generator generating
the channel B preamble (Y-preamble). At the same time, channel B audio and non-audio data
is transferred to the XADSR shift-register from the XADBUFB and XNADBUF registers.
The generated Y-preamble is output immediately after the channel A parity and is followed by
the audio and non-audio data in the XADSR, which is in turn followed by the calculated parity
for channel B. This completes a frame transmission. When the channel B parity is sent, the
audio data for the next frame, stored in XADBUFA and the non-audio data bits from the
XNADR, are uploaded to XADSR.
12.4
DAX PROGRAMMING MODEL
The programmer-accessible DAX registers are shown in Figure 12-2. The registers are
described in the following subsections. The Interrupt Vector table for the DAX is shown in
Table 12-1. The internal interrupt priority is shown in Table 12-2.
Table 12-1 DAX Interrupt Vectors
Condition
Address
Description
XAUR
VBA:$28
DAX transmit underrun error
XADE & XBLK
VBA:$2A
DAX block transferred
XADE
VBA:$2E
DAX audio data register empty
Table 12-2 DAX Interrupt Priority
Priority
Interrupt
highest
DAX transmit underrun error
DAX block transferred
lowest
DAX audio data register empty
Summary of Contents for DSP56367
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Page 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
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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 ...
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