2994 - MachXO2: If the device is not yet programmed, it will be booted in Default Mode Feature Row. Will the INITn pin automatically be used as an input? And can I (accidently) block the configuration of the FPGA by pulling INITn low?

• Related Articles

• 655 - How is the Global Set Reset (GSR) used in a design? Do I need to use the GSR symbol or component in my design to use the GSRN pin for the MachXO device?

  For the Lattice MachXO device, all the registers in the device will be reset upon power-up of the device, provided the power-up sequence is clean. This will happen without any additional effort on the part of the user. The software will evaluate the ...

• 2453 - LatticeXP2: What does the I/O Type in Table 14-1 of TN1141 mean? For example, is the INITN pin only used as a bi-directional pin when CFG0 is high?<q1><q2></q2></q1>

  The I/O Type in Table 14-1 of TN1141 is for all the sysCONFIG pins during configuration. For the dual-purpose sysCONFIG pins, when they are used as general purpose I/Os after configuration, they can use any I/O type such as input, output and ...

• 247 - Is an external pull up required on the MachXO SleepN pin?

  The SleepN pin on the MachXO C devices is an enable for the internal regulator. When the SleepN pin is asserted low the regulator is turned off and the device is put in a low power state. An external pull up is recommended or you can tie the pin to ...

• 2117 - MachXO2: Can I connect the JTAGENB pin of the MachXO2&nbsp;device&nbsp;directly to the VCC or GND?

  The JTAG ENABLE pin of MachXO2 is an optional input pin that can be used to control the function of the ispJTAG port during user mode. By default, the JTAGENB pin is a user I/O while the 4-wire ispJTAG port is used as a dedicated programming port. ...

• 739 - What is the default I/O state in a blank MachXO device?

  The silicon default of a bulk-erased MachXO device is as follows: Inputs are enabled, and referenced to Vccio. Buskeepers default to pullup. Outputs are tri-stated and default to 8ma at Vccio=1.8V and slow slew.