Selecting the Configuration Mode
Each configuration interface corresponds to one or more configuration modes and bus
widths.
- Select the configuration mode by setting the appropriate condition on the
CBUS[2:0],, andinput . - Set
CBUS2,CBUS1,CBUS0,SS_N, andTEST_Nusing a pull-up or pull-down resistor, or drive them with an external active device. - Do not toggle the mode before the enters user mode.
| Configuration Mode | Parallel/Serial | CSI | CBUS2, CBUS1, CBUS0 | Width | ||
|---|---|---|---|---|---|---|
| SPI Active | Serial | 1 | 1 | 1 | 3’b111 | x1 |
| Parallel | 1 | 1 | 1 | 3’b110 | x2 | |
| Parallel | 1 | 1 | 1 | 3’b101 | x4 | |
| SPI Passive | Serial | 1 | 1 | 0 | 3’b111 | x1 |
| Parallel | 1 | 1 | 0 | 3’b110 | x2 | |
| Parallel | 1 | 1 | 0 | 3’b101 | x4 | |
| Parallel | 1 | 1 | 0 | 3’b100 | x8 | |
| Parallel | 1 | 1 | 0 | 3’b011 | x16 | |
| Parallel | 1 | 1 | 0 | 3’b010 | x32 |
The JTAG/boundary-scan configuration interface is always available regardless of pin settings. If you send configuration instructions to the JTAG interface, the overwrites the previous configuration.
Note: You must set the configuration mode in the
software; the software includes the mode and other configuration options in the
bitstream.
The supported configuration modes are specific. Refer to your 's data sheet for information on the configuration modes it supports.