MOTOROLA
DSP96002 USER’S MANUAL
7 - 47
7.5.3.1
DCS DMA Destination Space Control (DDS2-DDS0) Bits 0,1,2
The DMA Destination Space control bits (DDS2-DDS0) specify the memory or I/O space that will be refer-
enced as destination by the DMA. The DDS2-DDS0 bits are cleared by Hardware and Software Reset.
7.5.3.2
DCS DMA Source Space Control (DSS2-DSS0) Bits 3,4,5
The DMA Source Space control bits (DSS2-DSS0) specify the memory or I/O space that will be referenced
as source by the DMA. The DSS2-DSS0 bits are cleared by Hardware and Software Reset.
7.5.3.3
DCS Reserved Bits (Bits 6, 7, 15-22, 27, 29)
These bits read as zero and should be written with zero for future compatibility.
7.5.3.4
DCS DMA Request Masks (M0-M6) Bits 8-14
The DMA Request mask bits select the source of DMA requests used to trigger DMA transfers. If a mask
bit is set, the corresponding device is selected as the DMA request source. If the mask bit is cleared, the
device is ignored. The DMA request sources may be the internal peripherals or external devices requesting
service through the
—
I
—
R
—
Q
–
A,
–
I
—
R
—
Q
–
B and
–
I
—
R
—
Q
–
C pins. The external inputs behave as edge-
triggered synchronous inputs. The mask bits are cleared by Hardware and Software Reset. The internal
DMA request sources are produced by ANDing the internal peripheral status bits with DE.
Each requesting device input is first individually ANDed with its respective mask bit (M0,M1,etc) and then
all AND outputs are ORed together. The OR output goes to the edge-triggered latch whose output initiates
DDS2
DDS1
DDS0
DMA Destination Memory Space
0 0 0 Internal Program Memory
0 0 1 Internal X Data Memory
0 1 0 Internal Y Data Memory
0 1 1 Internal I/O (X Memory Space)
1 0 0 External Program Memory
1 0 1 External X Data Memory
1 1 0 External Y Data Memory
1 1 1 External I/O (Y Memory Space)
DSS2
DSS1 DSS0
DMA Source Memory Space
0 0 0 Internal Program Memory
0 0 1 Internal X Data Memory
0 1 0 Internal Y Data Memory
0 1 1 Internal I/O (X Memory Space)
1 0 0 External Program Memory
1 0 1 External X Data Memory
1 1 0 External Y Data Memory
1 1 1 External I/O (Y Memory Space)
Содержание DSP96002
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