730 - MachXO: Why do external pull up required for MachXO SLEEPN pin?
The SLEEPN pin on the MachXO device is a control signal for the internal regulator. If the pin is pulled low it puts the device into a low power state.
Although the SLEEPN pin has a weak internal pull-up, an external pull-up is recommended if the pin is not otherwise driven by an external circuit. Alternatively user can tie the pin directly to the 3.3V rail.
Related Articles
2009 - MachXO:Which IBIS models should I use for the MachXO JTAG signal pins?
Solution: For the JTAG input pins, use the LVCMOS input models, input threshold voltage is referenced using the VCCAUX value, and select the model that has: TCK: bus keeper = NONE TDI: bus keeper = pull up TMS: bus keeper = pull up For the JTAG ...
6176 - MachXO2/MachXO3: Why there is no JTAG external pullups (TDI,TDO,TMS) recommendation in our documents such Hardware Checklist and Programming and Configuration user guide while external pull-ups were added in our Lattice demo and evaluation boards.
MachXO2 and MachXO3L/LF TDI,TDO,TMS signals have internal pull-ups, so external pull-ups are not required. However, good engineering practice for a critical bus like JTAG is to augment the internal pull-ups with external if the bus will not always be ...
791 - What type of pull ups are required for JTAG signals?
User may refer to respective device Hardware Checklist for sysCONFIG port pins pull up requirements. Example: MachXO3D hardware checklist
325 - How can I estimate the pull up and pull down resistors of Lattice's CPLD and FPGA devices?
User can find I/O Active Pull-up Current (Ipu), I/O Active Pull-down Current (Ipd), and the voltage for the I/O ports (e.g., Vccio) in Lattice's data sheets. User can derive the pull up and pull down resistor values by dividing the voltage by the ...
6305 - MachXO: Where to find the automotive BSDL files?
The automotive BSDL files for MachXO should be the same functionality as the standard device files on the website.