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TMS320VC549 Datasheet(PDF) 97 Page - Texas Instruments |
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TMS320VC549 Datasheet(HTML) 97 Page - Texas Instruments |
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97 / 111 page  TMS320C54x, TMS320LC54x, TMS320VC54x FIXED-POINT DIGITAL SIGNAL PROCESSORS SPRS039C – FEBRUARY 1996 – REVISED DECEMBER 1999 97 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 serial-port receive timing in TDM mode timing requirements for serial-port receive in TDM mode [H = 0.5tc(CO)] (’542/’543 only) (see Figure 38) ’542 ’543 UNIT MIN MAX UNIT tc(SCK) Cycle time, serial-port clock 8H † ns tf(SCK) Fall time, serial-port clock 6 ns tr(SCK) Rise time, serial-port clock 6 ns tw(SCK) Pulse duration, serial-port clock low/high 4H ns tsu(TD-TCL) Setup time, TDAT/TADD before TCLK falling edge –(3H–9) ns th(TCH-TD) Hold time, TDAT/TADD after TCLK rising edge, tw(SCKL) < 5H 0 ns th(TCL-TD) Hold time, TDAT/TADD after TCLK falling edge, tw(SCKL) > 5H 5H+5 ns tsu(TF-TCH) Setup time, TFRM before TCLK rising edge‡ 10 ns th(TCH-TF) Hold time, TFRM after TCLK rising edge‡ 10 ns † The serial-port design is fully static and, therefore, can operate with tc(SCK)approachinginfinity.Itischaracterizedapproachinganinputfrequency of 0 Hz but tested at a much higher frequency to minimize test time. ‡ TFRM timing and waveforms shown in Figure 38 are for external TFRM. TFRM can also be configured as internal. The TFRM internal case is illustrated in the transmit timing diagram in Figure 39. timing requirements for serial-port receive in TDM mode [H = 0.5tc(CO)] (’54x devices other than ’542/’543) (see Figure 38) ’C54x-40 ’LC54x-40 ’LC54x-50 ’54X-66 UNIT MIN MAX MIN MAX tc(SCK) Cycle time, serial-port clock 8H † 16H † ns tf(SCK) Fall time, serial-port clock 6 6 ns tr(SCK) Rise time, serial-port clock 6 6 ns tw(SCK) Pulse duration, serial-port clock low/high 4H 8H ns tsu(TD-TCH) Setup time, TDAT/TADD before TCLK rising edge 25 10 ns th(TCH-TD) Hold time, TDAT/TADD after TCLK rising edge –6 1 ns tsu(TF-TCH) Setup time, TFRM before TCLK rising edge‡ 10 10 ns th(TCH-TF) Hold time, TFRM after TCLK rising edge‡ 10 10 ns † The serial-port design is fully static and, therefore, can operate with tc(SCK)approachinginfinity.Itischaracterizedapproachinganinputfrequency of 0 Hz but tested at a much higher frequency to minimize test time. ‡ TFRM timing and waveforms shown in Figure 38 are for external TFRM. TFRM can also be configured as internal. The TFRM internal case is illustrated in the transmit timing diagram in Figure 39. |
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