IEEE 1149.1 Test Access Port Controller (JTAGC)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
19-14
Freescale Semiconductor
Preliminary
19.6
Initialization/Application Information
The test logic is a static logic design, and TCK can be stopped in either a high or low state without loss of
data. However, the system clock is not synchronized to TCK internally. Any mixed operation using both
the test logic and the system functional logic requires external synchronization.
To initialize the JTAGC module and enable access to registers, the following sequence is required:
1. Set the JCOMP signal to logic 1, thereby enabling the JTAGC TAP controller.
2. Load the appropriate instruction for the test or action to be performed.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
DBGRE
0
0
ND
0
0
NT
W
Reset
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
Figure 19-9. OnCE Shared Nexus Control Register (SNC)
Table 19-4. SNC Bit Description
Field
Description
bits 0–21
Reserved.
DBGRE
EVTI Debug Request Enable.
00 Disabled
x1 EVTI is used for debug request for e200z0
1x EVTI is used for debug request for e200z1
Note: The user will still need to program the DC1[4:3] register in each core to enable the debug request.
bits 24–25
Reserved.
ND
DMA Control. Determines which core’s master ID is used during DMA access.
00 DMA read/writes appear to be generated by e200z0
01 DMA read/writes appear to be generated by e200z1
1x Reserved (default to e200z0)
Note: The selected master ID for DMA access is set independently of which core is currently being
traced.
Note: ND does not control which core actually performs the Nexus read/write (DMA) access, it only controls the
master ID that the access uses for the transfer. All Nexus read/writes are performed by the e200z0 core.
bits 28–29
Reserved
NT
Trace Mode. Determines which core has ownership of the Tracing functionality.
00 e200z0 has ownership of
01 e200z1 has ownership of
1x Reserved (Default to e200z0)