Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
24-41
24.11.3 Read/Write Access Control/Status (RWCS)
The read write access control/status register provides control for read/write access. Read/write access
provides DMA-like access to memory-mapped resources on the system bus either while the processor is
halted, or during runtime. The RWCS register also provides read/write access status information as shown
in
Nexus Reg: 0x0007
Access: R/W
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
AC
RW
SZ
MAP
PR
BST
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
CNT
ERR
DV
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 24-18. Read/Write Access Control/Status Register (RWCS)
Table 24-29. RWCS Field Description
Field
Description
31
AC
Access control.
0 End access
1 Start access
30
RW
Read/write select.
0 Read access
1 Write access
29–27
SZ[2:0]
Word size.
000 8-bit (byte)
001 6-bit (halfword)
010 32-bit (word)
011 64-bit (doubleword - only in burst mode)
100–111 Reserved (default to word)
26–24
MAP[2:0]
MAP select.
000 Primary memory map
001-111 Reserved
23–22
PR[1:0]
Read/write access priority.
00 Lowest access priority
01 Reserved (default to lowest priority)
10 Reserved (default to lowest priority)
11 Highest access priority
21
BST
Burst control.
0 Module accesses are single bus cycle at a time.
1 Module accesses are performed as burst operation.
20–16
Reserved.
15–2
CNT[13:0]
Access control count. Number of accesses of word size SZ
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