Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
24-73
24.11.17.2 JTAG Sequence for Read Access of Memory-Mapped Resources
24.11.17.3 JTAG Sequence for Write Access of Memory-Mapped Resources
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)
Table 24-44. Accessing Memory-Mapped Resources (Reads)
Step #
TCLK clocks
Description
1
13
Nexus Command = write to read/write access address register (RWA)
2
37
Write RWA (initialize starting read address—data input on TDI)
3
13
Nexus Command = write to read/write control/status register (RWCS)
4
37
Write RWCS (initialize read access mode and CNT value—data input on TDI)
5
—
Wait for falling edge of RDY pin
6
13
Nexus Command = read read/write access data register (RWD)
7
37
Read RWD (data output on TDO)
8
—
If CNT > 0, go back to Step #5
Table 24-45. Accessing Memory-Mapped Resources (Writes)
Step #
TCLK clocks
Description
1
13
Nexus Command = write to read/write access control/status register (RWCS)
2
37
Write RWCS (initialize write access mode and CNT value—data input on TDI)
3
13
Nexus Command = write to read/write address register (RWA)
4
37
Write RWA (initialize starting write address—data input on TDI)
5
13
Nexus Command = read read/write access data register (RWD)
6
37
Write RWD (data output on TDO)
7
—
Wait for falling edge of RDY pin
8
—
If CNT > 0, go back to Step #5
Table 24-43. Accessing Internal Nexus3 Registers via JTAG/OnCE (continued)
Step #
TMS Pin
Description
Содержание MPC5565
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