Configuration Handbook - Kamami.pl

Device Configuration PinsTable 8–20. Dedicated Configuration Pins (Part 3 of 4)Pin NameUserModeConfigurationSchemenCEO N/A All Output Output that drives low when device configuration iscomplete. In single device configuration, this pin is leftfloating. In multi-device configuration, this pin feeds thenext device's nCE pin. The nCEO of the last device in thechain is left floating.DCLK N/A Synchronousconfigurationschemes (PSand PPS)InputClock input used to clock data from an external sourceinto the target device. Data is latched into the FPGA onthe rising edge of DCLK.In PPA mode, DCLK should be tied high to V CC to preventthis pin from floating.After configuration, this pin is tri-stated. In schemes thatuse a configuration device, DCLK will be driven low afterconfiguration is done. In schemes that use a control host,DCLK should be driven either high or low, whichever ismore convenient. Toggling this pin after configurationdoes not affect the configured device.DATA0 N/A All Input Data input. In serial configuration modes, bit-wideconfiguration data is presented to the target device onthe DATA0 pin.After configuration, EPC1 and EPC1441 devices tri-statethis pin, while EPC2 devices drive this pin high. Inschemes that use a control host, DATA0 should bedriven either high or low, whichever is more convenient.Toggling this pin after configuration does not affect theconfigured device.DATA[7..1] I/O Parallelconfigurationschemes(PPS andPPA)Pin TypeInputsDescriptionData inputs. Byte-wide configuration data is presented tothe target device on DATA[7..0].In serial configuration schemes, they function as user I/Opins during configuration, which means they are tristated.After PPA or PPS configuration, DATA[7..1] areavailable as a user I/O pins and the state of these pindepends on the Dual-Purpose Pin settings.DATA7 I/O PPA Bidirectional In the PPA configuration scheme, the DATA7 pinpresents the RDYnBSY signal after the nRS signal hasbeen strobed low.In serial configuration schemes, it functions as a user I/Oduring configuration, which means it is tri-stated.After PPA configuration, DATA7 is available as a user I/Oand the state of this pin depends on the Dual-PurposePin settings.8–66 Altera CorporationConfiguration Handbook, Volume 1 August 2005