Differential Multi-Mode Transceivers (Module D8)68C3 Operations Manual North Atlantic Industries, Inc. 12/19/2014Rev: 2014-12-19-0947 www.naii.com Page 122 of 330De-bounce TimeDe-bounce time can be utilized when channel is selected as an input to “filter” or “ignore” spurious initialtransitions. Enter required de-bounce time into appropriate channel registers. LSB weight determined fromDebounce LSB register.. Once a signal level is a logic voltage level period longer than the De-bounce time (LogicHigh > 2.0 v, and Logic Low < 0.8 v), a logic transition is validated. Signal pulse widths less than De-bounce timeare filtered. Once valid, the transition status register flag is set for the channel and the output logic changes state.Enter a value of 0 to disable De-bounce filtering. De-bounce defaults to 00h upon reset.REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTIONDE-BOUNCE TIME D D D D D D D D D D D D D D D D D=DATA BITLSB=ProgrammableDe-bounce LSBDe-bounce resolution= 160 ns x 2 de-bounce LSB valueThis results in a minimum resolution of 160 ns (Debounce LSB=0) and a maximum resolution of 5.24 ms(Debounce LSB=15).REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTIONDE-BOUNCE LSB X X X X X X X X X X X X D D D D D=DATA BITSlew Rate ModeLogic selectable reduced slew rate mode softens the driver output edges to control high frequency EMIemissions. With “slow” mode selected, the data rate is limited to about 250 kbps. “1” = normal mode, “0” = slowmode.REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTIONB4 B3 B2 B1 BankSLEW RATE MODE X X X X X X X X X X X X D D D D D=DATA BITBank ChannelB1 1-4B2 5-8B3 9-12B4 13-16Input Termination ControlEach differential input pair can be programmed to have an input termination of @ 120Ω or 12kΩ. Write logic ‘1’ toselect 120Ω for each channel. Default is @ 12KΩREGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ChannelINPUT TERMINATION D D D D D D D D D D D D D D D D D=DATA BIT
