Host Interface (HDI08)
HDI08 – DSP-Side Programmer’s Model
MOTOROLA
DSP56367
8-9
interrupt acknowledge input. If HDM[2:0] are not all cleared, the HDI08 operates as
described in Table 8-5.
If HDM1 or HDM0 are set, the DMA mode is enabled, and the HOREQ signal is used to
request DMA transfers (the value of the HM1, HM0, HLEND and HDREQ bits in the ICR
have no affect). When the DMA mode is enabled, the HDM2 bit selects the direction of DMA
transfers:
–
setting HDM2 sets the direction of DMA transfer to be DSP to host and enables
the HOREQ signal to request data transfer.
–
clearing HDM2 sets the direction of DMA transfer to be host to DSP and enables
the HOREQ signal to request data transfer.
The HACK input signal is used as a DMA transfer acknowledge input. If the DMA direction
is from DSP to host, the contents of the selected register are driven onto the host data bus
Table 8-5 HDM[2:0] Functionality
HDM
Mode
2
1
0
Description
ICR
0
0
0
DMA operation disabled
1
0
0
DMA Operation Enabled.
Host may set HM1 or HM0 in
the ICR to enable DMA
transfers.
0
0
1
DMA Mode Data Output
Transfers Enabled.
(24-Bit words)
0
1
0
DMA Mode Data Output
Transfers Enabled.
(16-Bit words)
0
1
1
DMA Mode Data Output
Transfers Enabled.
(8-Bit words)
1
0
1
DMA Mode Data Input
Transfers Enabled.
(24-Bit words)
1
1
0
DMA Mode Data Input
Transfers Enabled.
(16-Bit words)
1
1
1
DMA Mode Data Input
Transfers Enabled.
(8-Bit words)
INIT
HLEND
HF1
HF0
HDRQ
TREQ
RREQ
INIT
HM1
HM0
HF1
HF0
TREQ
RREQ
INIT
HDM1 HDM0
HF1
HF0
TREQ
RREQ
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: ......