Configuration Handbook - Kamami.pl

Configuring APEX 20KE & APEX 20KC DevicesFigure 7–24. APEX 20KE & APEX 20KC PPA Configuration Timing Waveform Using nRS & nWSt CF2ST1nCONFIG(1) nSTATUS(2) CONF_DONEnCS (3)CS (3)DATA[7..0]nWSnRSINIT_DONEUser I/ODATA7/RDYnBSY (5)t CF2SCD(4)t WSPt WS2RSt RDY2WSt STATUSt CSSU(4)t CSH(4)t DHByte 0 Byte 1 Byte nt CF2WSt DSU(4)t RS2WSt WS2RS(4)t CFGtRSD7High-Zt WS2Bt BUSYUser-Mode(4)t CD2UMNotes to Figure 7–24:(1) Upon power-up, the APEX 20KE or APEX 20KC device holds nSTATUS low for not more than 5 μs after V CCINTreaches its minimum requirement.(2) Upon power-up, before and during configuration, CONF_DONE is low.(3) The user can toggle nCS or CS during configuration if the design meets the specification for t CSSU , t WSP , and t CSH .(4) DATA0 should not be left floating after configuration. It should be driven high or low, whichever is more convenient.DATA[7..1], CS, nCS, nWS, nRS, and RDYnBSY are available as user I/O pins after configuration and the state oftheses pins depends on the dual-purpose pin settings.(5) DATA7 is a bidirectional pin. It is an input for configuration data input, but it is an output to show the status ofRDYnBSY.Table 7–6 defines the timing parameters for APEX 20KE or APEX 20KCdevices for PPA configuration.Table 7–6. PPA Timing Parameters for APEX 20KE & APEX 20KC Devices (Part 1 of 2)Symbol Parameter Min Max Unitst CF2CD nCONFIG low to CONF_DONE low 200 nst CF2ST0 nCONFIG low to nSTATUS low 200 nst CFG nCONFIG low pulse width 8 µst STATUS nSTATUS low pulse width 10 40 (1) µsAltera Corporation 7–51August 2005 Configuration Handbook, Volume 1