The SelectMAP interface allows an external processor to load the boot and
configuration data. The functional waveform in this section shows an example of the
SelectMAP interface data, clock, and control signals operation to load data into the
Versal adaptive SoCs. To boot the Versal device in SelectMAP, ensure that the
dedicated boot mode pins are set to SelectMAP (MODE[3:0]=
1010) and SMAP_RDWR_b=0. Also, the REF_CLK input must be at a valid
frequency and stable prior to the POR_B release. The Versal device samples the SelectMAP data pins on the rising SMAP_CLK
edges and the SMAP_BUSY signal is also clocked by the SMAP_CLK.
The waveform shows the 16 byte bus detect pattern for the SelectMAP boot mode. The waveform shows an example BUSY response. When SMAP_BUSY is asserted, the SMAP_CS_b signal must be deasserted within 24 SMAP_CLK cycles.
- After POR_B and SMAP_BUSY are deasserted, the user can start data loading.
- The SelectMAP bus detect pattern is the first 16 bytes of the PDI. This pattern determines if the SelectMAP data bus width used is 8 bit, 16 bit, or 32 bit. The JTAG_STATUS [5:4] SelectMAP bus width field is updated when this pattern is read by the BootROM.
- When SMAP_BUSY is asserted during SelectMAP data loading, the SMAP_CS_b must be deasserted within 24 SMAP_CLK cycles (CSMAPBUSYCS).
- After the last data byte is sent, deassert SMAP_CS_b and send a minimum of 24 SMAP_CLK cycles to ensure the DONE transitions to High.