Motorola DSP56012 User Manual

5. Assert HEN to enable the HI.

6. When HEN is deasserted, the data can be latched or read as appropriate if the 

timing requirements have been observed.

7. HOREQ will be deasserted if the operation is complete.

This transfer description is an overview. Specific and exact information for HI data 
transfers and their timing can be found in 

 and in the 

SP56012 Technical Data sheet (DSP56012/D)

Figure 4-24  HI Initialization–Host Side, DMA Mode

16-bit DMA 

Bit 5 = 0
Bit 6 = 1

$0

Reserved; write as 0

Initialize DSP

Initialize HI *

Bit 7 = 1

Optional

INTERRUPT CONTROL REGISTER (ICR)
(read/write)

DMA off

Bit 5 = 1
Bit 6 = 1

Step 2 Of Host Port configuration
2. Option 5: Select DMA mode for

enable 

Receive Data Full interrupt

Bit 0 = 1
Bit 1 = 0

enable 

Transmit Data Empty interrupt

Bit 0 = 0
Bit 1 = 1

24-bit DMA 

Bit 5 = 1
Bit 6 = 0

OR

OR

DSP TO HOST

OR

HOST TO DSP

INIT

HF1

HF0

TREQ

RREQ

7

0

HM0

HM1

6

5

4

3

2

1

AA0332k