Sample MachXO2 Lattice Diamond Project
MachXO2 Lattice Diamond Project
There are two implementations in the project: user and config for User Mode and Configure Mode respectively. Those two implementations share the same .lpf file. The Diamond project and file structure look like the following:
User implementation:
power_control
|___power_control.ldf
|___power_control.lpf
|___Strategy1.sty
|___user
|___source
|___adc_top.v
|___box_ave.v
|___demo_top_user.v
|___count16_ldrg.vhd
|___display.v
|___lcd_display.v
|___lcd4digit.v
|___LCDEncoding4to1.v
|___lcdencoding4to1com.v
|___pwm.v
|___sigmadelta_adc.v
|___ipexpress/LCDCharMap/LCDCharMap.ipx7 MachXO2 Low Power Control Demo
Config Implementation:
power_control
|___power_control.ldf
|___power_control.lpf
|___Strategy1.sty
|___config
|___source
|___adc_top.v
|___box_ave.v
|___demo_top_config.v
|___count16_ldrg.vhd
|___display.v
|___lcd_display.v
|___lcd4digit.v
|___LCDEncoding4to1.v
|___lcdencoding4to1com.v
|___pwm.v
|___sigmadelta_adc.v
|___wb_master.v
|___ipexpress/efb_spi_i2c/efb_spi_i2c.ipx
|___ipexpress/pwr_ctrl/pwr_ctrl.ipx
|___ipexpress/LCDCharMap/LCDCharMap.ipx
The following are necessary to enable the power control for the on-chip oscillator:
2.The STDBY port of OSCH needs to be set/reset to put the oscillator into Standby or Wake mode.
The Verilog code for OSCH instantiation looks like the following:
OSCH OSCH_inst (
.STDBY( STDBY ), // STDBY=1, stop oscillator; STDBY=0, start oscillator.
.OSC ( clk_osc ),
.SEDSTDBY ( )
/* synthesis syn_noprune = 1 */ ; // to prevent the oscillator from being optimized away
The on-chip oscillator can be turned on/off in two ways: through internal user logic and/or through the external I2C or SPI port.
In RTL coding, there Oscillator Instantiation 1. An OSCH module needs to be instantiated in the code.
