16.2.5 Special
(Ask a Question)16.2.5.1 FCEND_BUFF
(Ask a Question)Input | Output |
---|---|
A | Y |
A | Y |
---|---|
0 | 0 |
1 | 1 |
16.2.5.2 FCINIT_BUFF
(Ask a Question)Input | Output |
---|---|
A | Y |
A | Y |
---|---|
0 | 0 |
1 | 1 |
16.2.5.3 FLASH_FREEZE
(Ask a Question)The Flash_Freeze macro is a special-purpose macro that provides information on when the chip is about to go into Flash* Freeze mode to allow the user to perform any housekeeping needed before the device enters into Flash*Freeze mode. The macro has two outputs:
- FF_TO_START—This signal goes high when the FPGA is about to go into Flash*Freeze mode.
- FF_DONE—This signal goes high when the FPGA has successfully entered Flash*Freeze mode.
For more information about this macro, see the UG0450: SmartFusion2 and IGLOO2 System Controller User Guide and the SmartFusion2 and IGLOO2 FPGA Low-Power Design User Guide .
There is no simulation model for this macro. The two outputs remain low during simulation because Flash-Freeze is not supported during simulation.
16.2.5.4 LIVE_PROBE_FB
(Ask a Question)This is a special-purpose macro that feeds the live probe signals back to the fabric. You can connect the PROBE_A/PROBE_B signals to any unused I/O during design generation. This is useful if PROBE_A/PROBE_B cannot be brought out for debugging due to board limitations. PROBE_A and PROBE_B pins must be reserved, if LIVE_PROBE_FB macro is used. This macro is not supported in simulation.
16.2.5.5 RCOSC_1MHZ
(Ask a Question)16.2.5.6 RCOSC_1MHZ_FAB
(Ask a Question)16.2.5.7 RCOSC_25_50MHZ
(Ask a Question)16.2.5.8 RCOSC_25_50 MHZ_FAB
(Ask a Question)16.2.5.9 SYSCTRL_RESET_STATUS
(Ask a Question)16.2.5.10 SYSRESET
(Ask a Question)Input | Output |
---|---|
DEVRST_N | POWER_ON_RESET_N |
DEVRST_N | POWER_ON_RESET_N |
---|---|
0 | 0 |
1 | 1 |
16.2.5.11 XTLOSC
(Ask a Question)The crystal oscillator provides up to a 20 MHz clock signal. Physically, it requires connection to an external crystal. However, for simulation purposes the XTL pin provides a clock signal running at the desired input frequency. MODE is a two-bit configuration parameter that specifies the frequency range, as shown in the following table.
MODE[1:0] | Frequency Range (MHz) |
---|---|
00 | N/A |
01 | 0.032 – 0.075 |
10 | 0.075 – 2.0 |
11 | 2.0 – 20.0 |