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Nexus Development Interface (NDI)
PXN20 Microcontroller Reference Manual, Rev. 1
36-36
Freescale Semiconductor
details the status bit encodings.
36.6.8.4
Read/Write Access Address (RWA)
The read/write access address register provides the system bus address to be accessed when initiating a
read or a write access.
36.6.8.5
Read/Write Access Data (RWD)
The read/write access data register provides the data to/from system bus memory-mapped locations when
initiating a read or a write access.
MAP
MAP Select.
000 Primary memory map.
001–111 Reserved.
PR
Read/Write Access Priority.
00 Lowest access priority.
01 Reserved (default to lowest priority).
10 Reserved (default to lowest priority).
11 Highest access priority.
BST
Burst Control.
0 Module accesses are single bus cycle at a time.
1 Module accesses are performed as burst operation.
CNT
Access Control Count. Number of accesses of word size SZ.
ERR
Read/Write Access Error. See
DV
Read/Write Access Data Valid. See
Table 36-24. Read/Write Access Status Bit Encoding
Read Action
Write Action
ERR
DV
Read access has not completed
Write access completed without error
0
0
Read access error has occurred
Write access error has occurred
1
0
Read access completed without error
Write access has not completed
0
1
Not allowed
Not allowed
1
1
Nexus Reg: 0x9
Access: User read/write
31 30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
Read/Write Address
W
Reset 0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 36-18. Read/Write Access Address Register (RWA)
Table 36-23. RWCS Field Description (continued)
Field
Description
Summary of Contents for PXN2020
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