Freescale Semiconductor e200z3, Справочное руководство, Страница: 422 / 442

Nexus3/ Module
e200z3 Power Architecture Core Reference Manual, Rev. 2
10-56 Freescale Semiconductor
10.15.2 JTAG Sequence for Read Access of Memory-Mapped Resources
Table 10-42 shows the JTAG sequence for read-accessing memory-mapped resources.
10.15.3 JTAG Sequence for Write Access of Memory-Mapped Resources
Table 10-43 shows the JTAG sequence for write-accessing memory-mapped resources.
Table 10-42. 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 nex_rdy_b 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 10-43. 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 nex_rdy_b pin
8 — If CNT > 0, go back to Step #5