62 - 5
More For |
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Information |
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.wwwGoto: |
PORT |
freescale |
B |
On |
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This |
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com. |
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Product, |
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MOTOROLA
Freescale Semiconductor, Inc.
HOST PROCESSOR |
DMA CONTROLLER |
DSP56002 |
1. PROGRAM DMA CONTROLLER.
—START ADDRESS
—BYTE COUNT
—TRANSFER DIRECTION
—START DMA CHANNEL
7 |
0 |
2.INITIALIZE DSP56002 HOST INTERFACE.
—MODE 24 BIT DMA
—HOST TO DSP
—USE INIT BIT TO:
CLEAR TXDE
SET HRDF
LOAD DMA COUNTER
WRITE ICR
$0 |
1 |
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HF1 HF0 |
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INIT |
HM1 |
HM0 |
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TREQ |
RREQ |
7 0
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HF3 |
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HCIE |
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HTIE |
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X:$FFE8 |
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3. TELL DSP56002. |
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— SOURCE POINTER ADDRESS |
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HRIE |
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— ENABLE HTIE (CAN BE DONE |
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WITH A HOST COMMAND). |
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4. ASSERT HREQ TO START DMA TRANSFER. |
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5. HOST IS FREE TO PERFORM |
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OTHER TASKS (i.e., DSP TO HOST |
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6. DMA CONTROLLER PERFORMS READS. |
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TRANSFER ON A POLLED BASIS). |
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HREQ |
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RXH |
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RXM |
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8. TERMINATE DMA CHANNEL. |
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RXL |
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P:$0000 |
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EXCEPTION VECTOR TABLE |
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RXH |
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9. TERMINATE DSP DMA MODE BY |
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RXM |
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CLEARING HM1, HM0, AND TREQ. |
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P:$0022 |
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HOST TRANSMIT DATA VECTOR |
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RXL |
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P:$007E |
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AVAILABLE FOR HOST COMMAND |
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FAST INTERRUPT |
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LONG INTERRUPT |
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7. DMA CONTROLLER INTERRUPTS HOST |
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WHEN TRANSFERS ARE DONE. |
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Figure 5-40 DSP to Host DMA Procedure
INTERRUPT
CONTROL REGISTER (ICR)
HOST CONTROL REGISTER (HCR)
(HI) INTERFACE HOST |
Semiconductor, Freescale |
|
.Inc |