7284 - MACHXO3/MACHXO2: What can cause EFB to malfunction in hardware?

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• 534 - MachXO: Why can't I scan or program the MachXO device on the MachXO Mini board after I programmed my pattern into the device?

  The MachXO JTAG pins on the MACHXO Mini board share the same traces with some generic IOs of the MachXO device (as shown on page 4 and page 2 of the schematic). If the new design patterns have signals driving out of these pins, they could potentially ...

• 7481 - MachXO3/MachXO2: Should PB231101 be followed when using EFB at usermode?

  Solution: PB231101 applies for for EFB even at usermode. Issue #1: Race condition between CS and MCLK at the end of SPI transaction: This issue occurs even at user mode since EFB block is also involved with this issue. To avoid issue in SPI ...

• 2123 - MachXO2: Can the user use MachXO2's Embedded Functional Block (EFB) I2C pins (SCL and SDA) to work with soft (NOT EFB) I2C logic?

  Definition: The MachXO2's EFB Primary I2C have dedicated pins. User can't use them for general purpose when enabled for EFB I2C usage, by enabling the Primary I2C Port. However, if the I2C Primary port is not enabled, then the I2C IOs become User ...

• 1943 - MachXO: With no DONE bit, how can I use JTAG to see if the SRAM download from flash is finished?

  The way to check the MachXO configuration status through JTAG is to use the capture instruction. For the MachXO the capture instruction (which is the instruction shifting out of the instruction register) is 0x19 (if the device is blank) or 0x1D (if ...

• 2151 - [MachXO2] Does MachXO2 EFB I2C support frequencies other than the 50, 100, and 400 KHz options available in IPexpress?

  Yes, even though IPexpress GUI provides only 3 options, you can operate EFB I2C hard core in master or slave mode at any clock that does not violate the I2C spec. You don’t need to do any clock stretch. To achieve any other clock operation meeting ...