![background image](http://html.mh-extra.com/html/motorola/dsp56367/dsp56367_user-manual_246154195.webp)
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
Содержание DSP56367
Страница 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Страница 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Страница 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Страница 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Страница 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Страница 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Страница 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Страница 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Страница 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Страница 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Страница 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Страница 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Страница 522: ...Index 6 MOTOROLA Index ...
Страница 523: ......