Configuration Handbook - Kamami.pl

Configuring APEX 20KE & APEX 20KC DevicesDeviceConfigurationPinsThe following tables describe the connections and functionality of all theconfiguration related pins on the APEX 20KE or APEX 20KC device.Table 7–9 describes the dedicated configuration pins, which are requiredto be connected properly on your board for successful configuration.Some of these pins may not be required for your configuration schemes.Table 7–9. Dedicated Configuration Pins on the APEX 20KE & APEX 20KC Device (Part 1 of 5)Pin NameMSEL0MSEL1UserModeConfigurationSchemePin TypeDescriptionN/A All Input Two-bit configuration input that sets the APEX 20KE orAPEX 20KC device configuration scheme. SeeTable 7–3 for the appropriate connections. These pinsmust remain at a valid state during power-up, beforenCONFIG is pulled low to initiate a reconfiguration andduring configuration.nCONFIG N/A All Input Configuration control input. Pulling this pin low duringuser-mode will cause the FPGA to lose its configurationdata, enter a reset state, tri-state all I/O pins, andreturning this pin to a logic high level will initiate areconfiguration.If your configuration scheme uses an enhancedconfiguration device or EPC2 device, nCONFIG can betied directly to V CC or to the configuration device’snINIT_CONF pin. For successful configuration ofAPEX 20KE devices, nCONFIG must be tied to V CCINTthrough a 10-kΩ pull-up resistor.Altera Corporation 7–59August 2005 Configuration Handbook, Volume 1