Nexus Development Interface (NDI)
31-62
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
•
Zx = Data size (fixed)
•
Ax = Unique portion of the address (variable)
•
Dx = Write data (variable: 8-, 16- or 32-bit)
31.14.10 IEEE 1149.1 (JTAG) RD/WR Sequences
This section contains example JTAG/OnCE sequences used to access resources.
31.14.10.1 JTAG Sequence for Accessing Internal Nexus Registers
Table 31-32. Direct Write Message Example (12 MDO and Two 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 31-33. 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)
6
1
EXIT1-DR
UPDATE-DR (Nexus shifter is transferred to Nexus command register)
7
1
UPDATE-DR
SELECT-DR_SCAN
8
0
SELECT-DR_SCAN
CAPTURE-DR (Register value is transferred to Nexus shifter)
9
0
CAPTURE-DR
SHIFT-DR
10
0
(31) TCK clocks issued to transfer register value to TDO pin while shifting in TDI value
11
1
SHIFT-DR
EXIT1-DR (msb of value is shifted in/out of shifter)
12
1
EXIT1-DR
UPDATE -DR (if access is write, shifter is transferred to register)
13
0
UPDATE-DR
RUN-TEST/IDLE (transfer complete - Nexus controller to reg. select state)
Summary of Contents for PXR4030
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Page 30: ...PXR40 Microcontroller Reference Manual Rev 1 Freescale Semiconductor xxx...
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Page 66: ...Memory Map PXR40 Microcontroller Reference Manual Rev 1 2 4 Freescale Semiconductor...
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