Configuration Handbook - Kamami.pl

Passive Parallel Asynchronous ConfigurationFigure 7–34 shows the timing waveform for the PPA configurationscheme when using a strobed nRS and nWS signal.Figure 7–34. Stratix II & Stratix II GX PPA Configuration Timing Waveform Using nRS & nWS Note (1)t CF2ST1nCONFIG(2) nSTATUS(3) CONF_DONE(4) nCS(4) CSDATA[7..0]nWSnRSINIT_DONEUser I/O(6) DATA7/RDYnBSYt CF2SCD(5)t WSPt WS2RSt RDY2WSt STATUSt CSSU(5)t CSH(5)t DHByte 0 Byte 1 Byte nt CF2WSt DSU(5)t RS2WSt WS2RS(5)t CFGtRSD7High-Zt WS2Bt BUSYUser-Mode(5)t CD2UMNotes to Figure 7–34:(1) The beginning of this waveform shows the device in user-mode. In user-mode, nCONFIG, nSTATUS andCONF_DONE are at logic high levels. When nCONFIG is pulled low, a reconfiguration cycle begins.(2) Upon power-up, Stratix II and Stratix II GX devices hold nSTATUS low for the time of the POR delay.(3) Upon power-up, before and during configuration, CONF_DONE is low.(4) The user can toggle nCS or CS during configuration if the design meets the specification for t CSSU , t WSP , and t CSH .(5) DATA[7..0], 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.(6) DATA7 is a bidirectional pin. It is an input for configuration data input, but it is an output to show the status ofRDYnBSY.Table 7–18 defines the timing parameters for Stratix II and Stratix II GXdevices for PPA configuration.Table 7–18. PPA Timing Parameters for Stratix II & Stratix II GX Devices (Part 1 of 2) Note (1)Symbol Parameter Min Max Unitst CF2CD nCONFIG low to CONF_DONE low 800 nst CF2ST0 nCONFIG low to nSTATUS low 800 ns7–82 Altera CorporationStratix II Device Handbook, Volume 2 May 2007