17-24
MC9328MX1 Reference Manual
MOTOROLA
Multimedia Accelerator (MMA)
17.3.5 MMA DCT/iDCT Registers
There are 11 registers that control DCT/iDCT functions.
17.3.5.1 DCT/iDCT Control Register
This register controls the function of DCT/iDCT and the interface module. This is a read/write register.
MMA_DCTCTRL
DCT/iDCT Control Register
Addr
0x00222400
BIT
31 30
29
28 27 26 25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15 14
13
12 11 10
9
8
7
6
5
4
3
2
1
0
DCT_HWORD_SWAP
DATAINSHIFT
SEMA
EN
DCT
XPOSE
DCT
CLK
EN
SW
RST
DCT
BY
PASS
ARMMCM
SEL
DCT/
IDCT
DCT ENA
TYPE
r
r
rw
rw rw rw rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 17-24. DCT/iDCT Control Register Description
Name
Description
Setting
Reserved
Bits 31–14
Reserved—These bits are reserved and should read 0.
DCT_HWORD
_SWAP
Bit 13
DCT Half-Word Swap
—This bit determines if the
data is swapped in half-word (16-bit) or word (32-bit).
0 = Not swap data in half word, result in
data{data[31:0]}
1 = Swap data in half word
data{data[15:0], data[31:16]
DATAINSHIFT
Bits 12–9
DATAINSHIFT
—Reserved for future use and should be written with 0 for normal operation.
SEMAEN
Bit 8
SEMAEN
—Reserved for future use and must be written with 0 for normal operation.
DCTXPOSE
Bit 7
DCT Transpose
—Enables/Disables the DCT output
to be transposed.
0 = Disable transpose
1 = Enable transpose
DCTCLKEN
Bit 6
DCT Clock Enable
—Enables/Disables the DCT
clock to save power when DCT is not in use.
0 = Disable clock
1 = Enable clock
SWRST
Bit 5
Software Reset
—Resets the DCT Module.
0 = No effect
1 = Resets DCT module
DCTBYPASS
Bit 4
DCT Bypass
—Enables DCT/iDCT input data to be
bypassed to the output without being transformed.
0 = Perform transform
1 = Bypass
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