Configuration Handbook - Kamami.pl

6. Configuring APEX IIDevicesCF51004-2.1IntroductionAPEX TM II devices can be configured using one of four configurationschemes. All configuration schemes use either a microprocessor orconfiguration device.APEX II devices can be configured using the passive serial (PS), fastpassive parallel (FPP), passive parallel asynchronous (PPA), and JointTest Action Group (JTAG) configuration schemes. The configurationscheme used is selected by driving the APEX II device MSEL1 and MSEL0pins either high or low as shown in Table 6–1. If your application onlyrequires a single configuration mode, the MSEL pins can be connected toV CC (V CCIO of the I/O bank where the MSEL pin resides) or to ground. Ifyour application requires more than one configuration mode, you canswitch the MSEL pins after the FPGA is configured successfully. Togglingthese pins during user-mode does not affect the device operation;however, the MSEL pins must be valid before a reconfiguration isinitiated.Table 6–1. APEX II Configuration SchemesMSEL1 MSEL0 Configuration Scheme0 0 PS1 0 FPP1 1 PPA(1) (1) JTAG Based (2)Notes to Table 6–1:(1) Do not leave the MSEL pins floating; connect them to a low- or high-logic level.These pins support the non-JTAG configuration scheme used in production. Ifonly JTAG configuration is used, you should connect the MSEL pins to ground.(2) JTAG-based configuration takes precedence over other configuration schemes,which means MSEL pin settings are ignored.Altera Corporation 6–1August 2005