8-22
DSP56367
MOTOROLA
Host Interface (HDI08)
HDI08 – External Host Programmer’s Model
In the DMA modes where HDM[2:0]=100 and (HM1
≠
0 or HM0
≠
0), TREQ must be set and
RREQ must be cleared to direct DMA transfers from host to DSP. In the other DMA modes,
TREQ is ignored.
Table 8-9 summarizes the effect of RREQ and TREQ on the HOREQ, HTRQ and HRRQ
signals.
8.6.1.3
ICR Double Host Request (HDRQ) Bit 2
The HDRQ bit determines the functions of the HOREQ/HTRQ and HACK/HRRQ signals as
shown in Table 8-11.
8.6.1.4
ICR Host Flag 0 (HF0) Bit 3
The HF0 bit is used as a general purpose flag for host-to-DSP communication. HF0 may be
set or cleared by the host processor and cannot be changed by the DSP core. HF0 is reflected
in the HSR on the DSP side of the HDI08.
Table 8-9 TREQ RREQ Interrupt Mode (HDM[2:0]=000 or HM[1:0]=00)
TREQ
RREQ
HDRQ=0
HDRQ=1
HOREQ signal
HTRQ signal
HRRQ signal
0
0
No Interrupts (Polling)
No Interrupts (Polling)
No Interrupts (Polling)
0
1
RXDF Request (Interrupt)
No Interrupts (Polling)
RXDF Request (Interrupt)
1
0
TXDE Request (Interrupt)
TXDE Request (Interrupt)
No Interrupts (Polling)
1
1
RXDF and TXDE Requests (Interrupts)
TXDE Request (Interrupt)
RXDF Request (Interrupt)
Table 8-10 TREQ RREQ DMA Mode (HM1
≠
0 or HM0
≠
0)
TREQ
RREQ
HDRQ=0
HDRQ=1
HOREQ signal
HTRQ signal
HRRQ signal
0
0
No DMA request
No DMA request
No DMA request
0
1
DSP to Host Request (RX)
No DMA request
DSP to Host Request (RX)
1
0
Host to DSP Request (TX)
Host to DSP Request (TX)
No DMA request
1
1
Reserved
Reserved
Reserved
Table 8-11 HDRQ
HDRQ
HOREQ/HTRQ pin
HACK/HRRQ pin
0
HOREQ signal
HACK signal
1
HTRQ signal
HRRQ signal
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: ......