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TMS320VC33 Arkusz danych(PDF) 45 Page - Texas Instruments |
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TMS320VC33 Arkusz danych(HTML) 45 Page - Texas Instruments |
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45 / 58 page ![]() TMS320VC33 DIGITAL SIGNAL PROCESSOR SPRS087E -- FEBRUARY 1999 -- REVISED JANUARY 2004 45 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251--1443 serial-port timing parameters The following tables define the timing parameters for the serial port. timing requirements (see Figure 31 and Figure 32) MIN MAX UNIT t Cycle time CLKX/R CLKX/R ext tc(H) *2.6 ns tc(SCK) Cycle time, CLKX/R CLKX/R int tc(H) *2 tc(H) *216 ns t Pulse duration CLKX/R high/low CLKX/R ext tc(H) +5 ns tw(SCK) Pulse duration, CLKX/Rhigh/low CLKX/R int [tc(SCK)/2] -- 4 [tc(SCK)/2] + 4 ns tr(SCK) Rise time, CLKX/R 3 ns tf(SCK) Fall time, CLKX/R 3 ns t Setup time DR before CLKR low CLKR ext 4 ns tsu(DR-CLKRL) Setup time, DR before CLKR low CLKR int 5 ns t Hold time DR after CLKR low CLKR ext 3 ns th(CLKRL-DR) Hold time, DR after CLKR low CLKR int 0 ns t Setup time FSR before CLKR low CLKR ext 4 ns tsu(FSR-CLKRL) Setup time, FSR before CLKR low CLKR int 5 ns t Hold time FSX/R input after CLKX/R low CLKX/R ext 3 ns th(SCKL-FS) Hold time, FSX/R input after CLKX/Rlow CLKX/R int 0 ns t Setup time external FSX before CLKX CLKX ext --[tc(H) -- 6] [tc(SCK)/2] -- 6 ns tsu(FSX-CLKX) Setup time, external FSX before CLKX CLKX int --[tc(H) -- 10] tc(SCK)/2 ns switching characteristics over recommended operating conditions (see Figure 31 and Figure 32) PARAMETER MIN MAX UNIT td(H1H-SCK) Delay time, H1 high to internal CLKX/R 4 ns t Delay time CLKX to DX valid CLKX ext 6 ns td(CLKX-DX) Delay time, CLKX to DX valid CLKX int 5 ns t Delay time CLKX to internal FSX high/low CLKX ext 5 ns td(CLKX-FSX) Delay time, CLKX to internal FSX high/low CLKX int 4 ns t Delay time CLKX to first DX bit FSX precedes CLKX high CLKX ext 5 ns td(CLKX-DX)V Delay time, CLKX to first DX bit, FSX precedes CLKX high CLKX int 4 ns td(FSX-DX)V Delay time, FSX to first DX bit, CLKX precedes FSX 6 ns tdis(CLKX-DXZ) Disable time, DX high impedance following last data bit from CLKX high 6 ns |
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