3-46
DSP56367
MOTOROLA
Specifications
Parallel Host Interface (HDI08) Timing
Figure 3-19 Asynchronous Bus Arbitration Timing
Background explanation for Asynchronous Bus Arbitration:
The asynchronous bus arbitration is enabled by internal synchronization circuits on BG and
BB inputs. These synchronization circuits add delay from the external signal until it is
exposed to internal logic. As a result of this delay, a 56300 part may assume mastership and
assert BB for some time after BG is negated. This is the reason for timing 250.
Once BB is asserted, there is a synchronization delay from BB assertion to the time this
assertion is exposed to other 56300 components which are potential masters on the same bus.
If BG input is asserted before that time, a situation of BG asserted, and BB negated, may
cause another 56300 component to assume mastership at the same time. Therefore some
non-overlap period between one BG input active to another BG input active is required.
Timing 251 ensures that such a situation is avoided.
3.11
PARALLEL HOST INTERFACE (HDI08) TIMING
Table 3-18 Host Interface (HDI08) Timing
No.
Characteristics
3
Expression
120 MHz
Unit
Min
Max
317
Read data strobe assertion width
4
HACK read assertion width
T
C
+ 9.9
18.3
—
ns
318
Read data strobe deassertion width
4
HACK read deassertion width
—
9.9
—
ns
BG1
BG2
250+251
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: ......