Configuration Handbook - Kamami.pl

Passive Parallel Asynchronous ConfigurationFigure 8–24. 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 8–24:(1) Upon power-up, the Mercury, APEX 20K, ACEX 1K, or FLEX 10K device holds nSTATUS low for not more than 5 μsafter V CC reaches 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.Tables 8–15 through 8–17 define the timing parameters for Mercury,APEX 20K (2.5 V), ACEX 1K, and FLEX 10K devices for PPAconfiguration.Table 8–15. PPA Timing Parameters for Mercury Devices (Part 1 of 2) Note (1)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 21 µs8–54 Altera CorporationConfiguration Handbook, Volume 1 August 2005