Jtag Sequence For Read Access Of Memory-Mapped Resources - STMicroelectronics SPC572L series Reference Manual

e200z215An3 Nexus 3 Module
66.23.2

JTAG sequence for read access of memory-mapped resources

Table 1121. Accessing memory-mapped resources (reads)
Step # TCLK clocks
1 13
2 37
3 13
4 37
5 —
6 13
7 37
8 —
66.23.3 JTAG sequence for write access of memory-mapped resources
Table 1122. Accessing memory-mapped resources (writes)
Step # TCLK clocks
1 13
2 37
3 13
4 37
5 13
6 37
7 —
8 —
1982/2058
Nexus Command = write to Read/Write Access Address Register (RWA)
Write RWA (initialize starting read address — data input on TDI)
Nexus Command = write to Read/Write Control/Status Register (RWCS)
Write RWCS (initialize read access mode and CNT value — data input on TDI)
Wait for falling edge of nex_rdy_b or nex_err_b pin
Nexus Command = read Read/Write Access Data Register (RWD)
Read RWD (data output on TDO)
If CNT > 0, go back to Step #5
Nexus Command = write to Read/Write Access Control/Status Register (RWCS)
Write RWCS (initialize write access mode and CNT value — data input on TDI)
Nexus Command = write to Read/Write Address Register (RWA)
Write RWA (initialize starting write address — data input on TDI)
Nexus Command = read Read/Write Access Data Register (RWD)
Write RWD (data output on TDO)
Wait for falling edge of nex_rdy_b or nex_err_b pin
If CNT > 0, go back to Step #5
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