Programming Model
MOTOROLA
Multimedia Accelerator (MMA)
17-17
17.3.3.3 MMA MAC X Length Register
XINDEX
Bits 15–0
MAC X Index
—Determines part of the offset from the base address.
The X Address Index (actual access address) is equal to MMA_MAC contents of
MMA_MAC_ [contents of MMA_MAC_X the number of iterations since
initialization, the index last wrapped, or the last MMA_MAC_XCOUNT iterations (when the
X INDEX LOAD bit is set)].
MMA_MAC_XLENGTH
MMA MAC X Length Register
Addr
0x00222208
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
COLUMN
TYPE
rw
rw
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
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
LENGTH
TYPE
rw
rw
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 17-14. MMA MAC X Length Register Description
Name
Description
COLUMN
Bits 31–16
Column Size
—MMA_MAC_XINDEX wraps around to the base of the buffer when
MMA_MAC_ MMA_MAC_XINCR is greater than COLUMN. Writing 0 to this register will
disable the wrapping of address.
Note:
Note: If the current MMA_MAC_XINDEX is 12 and the COLUMN is 16, MMA_MAC_XINCR
is 8, then the next XINDEX will be (12+8)% 16 == 4. The physical address is 4 +
MMA_MAC_XBASE.
LENGTH
Bits 15–0
Circular Length
—Circular Length - Determines the size of the X data buffer. Address_Index wraps
back to base of buffer when Address MMA_MAC_XMODIFY is greater than LENGTH.
Writing 0 to this register will disable the wrapping of address.
Note:
Note: If the current Address_Index is 12 and the LENGTH is 16, MMA_MAC_XMODIFY is 8,
then the next Address_Index will be (12+8)% 16 == 4. The physical address is 4 +
MMA_MAC_XBASE.
Table 17-13. MMA MAC X Index Register Description (Continued)
Name
Description
Содержание DragonBall MC9328MX1
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