RocketIO™ Transceiver User Guide www.xilinx.com 127UG024 (v2.3.2) June 24, 2004 1-800-255-7778Timing Parameters RTiming ParametersParameter designations are constructed to reflect the functions they perform, as well as the I/Osignals to which they are synchronous. The following subsections explain the meaning of each ofthe basic timing parameter designations used in the tables.Setup/Hold Times of Inputs Relative to ClockBasic Format:ParameterName_SIGNALwhereParameterName = T with subscript string defining the timing relationshipSIGNAL = name of RocketIO signal synchronous to the clockParameterName Format:T GxCK = Setup time before clock edgeT GCKx = Hold time after clock edgewherex = C (Control inputs)D (Data inputs)Setup/Hold Time (Examples):T GCCK _RRST/T GCKC _RRST Setup/hold times of RX Reset inputrelative to rising edge of RXUSRCLK2T GDCK _TDAT/T GCKD _TDAT Setup/hold times of TX Data inputsrelative to rising edge of TXUSRCLK2Clock to Output DelaysBasic Format:ParameterName_SIGNALwhereParameterName = T with subscript string defining the timing relationshipSIGNAL = name of RocketIO signal synchronous to the clockParameterName Format:T GCKx = Delay time from clock edge to outputwherex = CO (Control outputs)DO (Data outputs)ST (Status outputs)Output Delay Time (Examples):T GCKCO _CHBO Rising edge of RXUSRCLK to Channel Bond outputsT GCKDO _RDAT Rising edge of RXUSRCLK2 to RX Data outputsT GCKST _TBERR Rising edge of TXUSRCLK2 to TX Buffer Err output
