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Nexus
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
25-71
an example data write message with 12 MDO and two MSEO configuration.
T0, A0, D0 are the least significant bits (LSB) where:
•
Tx = TCODE number (fixed)
•
Sx = Source processor (fixed)
•
Zx = Data size (fixed)
•
Ax = Unique portion of the address (variable)
•
Dx = Write data (variable: 8-, 16- or 32-bit)
25.14.10 IEEE
®
1149.1 (JTAG) RD/WR Sequences
This section contains example JTAG/OnCE sequences used to access resources.
25.14.10.1 JTAG Sequence for Accessing Internal Nexus Registers
Table 25-41. Direct Branch Message Example (12 MDO and 2 MSEO)
Clock
MDO[11:0]
MSEO[1:0]
State
11
10
9
8
7
6
5
4
3
2
1
0
0
X
X
X
X
X
X
X
X
X
X
X
X
1
1
Idle (or end of last message)
1
I1
I0
S3
S2
S1
S0
T5
T4
T3
T2
T1
T0
0
0
Start Message
2
0
0
0
0
0
0
0
0
0
0
I3
I2
1
1
End Packet and End Message
3
X
X
X
X
S1
S0
T5
T4
T3
T2
T1
T0
0
0
Start of Next Message
Table 25-42. Direct Write Message Example (12 MDO and 2 MSEO)
Clock
MDO[11:0]
MSEO[1:0]
State
11
10
9
8
7
6
5
4
3
2
1
0
0
X
X
X
X
X
X
X
X
X
X
X
X
1
1
Idle (or end of last message)
1
Z1
Z0
S3
S2
S1
S0
T5
T4
T3
T2
T1
T0
0
0
Start Message
2
0
0
0
0
0
0
0
A3
A2
A1
A0
Z2
0
1
End Packet
3
X
X
X
X
D7
D6
D5
D4
D3
D2
D1
D0
1
1
End Packet/End Message
Table 25-43. Accessing Internal Nexus3 Registers via JTAG/OnCE
Step #
TMS Pin
Description
1
1
IDLE
−>
SELECT-DR_SCAN
2
0
SELECT-DR_SCAN
−>
CAPTURE-DR (Nexus command register value loaded in shifter)
3
0
CAPTURE-DR
−>
SHIFT-DR
4
0
(7) TCK clocks issued to shift in direction (read/write) bit and first 6 bits of Nexus reg. addr.
5
1
SHIFT-DR
−>
EXIT1-DR (7th bit of Nexus reg. shifted in)
Содержание MPC5566
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