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UM0434 Datasheet(PDF) 379 Page - STMicroelectronics |
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UM0434 Datasheet(HTML) 379 Page - STMicroelectronics |
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379 / 390 page  Nexus3 module UM0434 380/391 12.15.3 JTAG sequence for write access of Memory-Mapped resources Table 283 shows the JTAG sequence for write-accessing memory-mapped resources. 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 282. Accessing memory-mapped resources (reads) (continued) Step TCLK clocks Description Table 283. 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 |
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