Configuration Handbook - Kamami.pl

Device Configuration PinsTable 7–9. Dedicated Configuration Pins on the APEX 20KE & APEX 20KC Device (Part 4 of 5)Pin NameUserModeConfigurationSchemePin TypeDescriptionDATA7 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.nWS I/O PPA Input Write strobe input. A low-to-high transition causes thedevice to latch a byte of data on the DATA[7..0] pins.In non-PPA schemes, it functions as a user I/O duringconfiguration, which means it is tri-stated.After PPA configuration, nWS is available as a user I/Oand the state of this pin depends on the Dual-PurposePin settings.nRS I/O PPA Input Read strobe input. A low input directs the device to drivethe RDYnBSY signal on the DATA7 pin.If the nRS pin is not used in PPA mode, it should be tiedhigh.In non-PPA schemes, it functions as a user I/O duringconfiguration, which means it is tri-stated.After PPA configuration, nRS is available as a user I/Oand the state of this pin depends on the Dual-PurposePin settings.7–62 Altera CorporationConfiguration Handbook, Volume 1 August 2005