TMS320VC549 datasheet(43/60 Pages) TI

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TMS320VC549

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS078F – SEPTEMBER 1998 – REVISED MAY 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

serial port transmit timing (continued)

switching characteristics over recommended operating conditions for serial port transmit with

internal clocks and frames [H = 0.5tc(CO)] (see Figure 23)

PARAMETER

’549-80

’549-100

’549-120

UNIT

MIN

TYP

MAX

tc(SCK)

Cycle time, serial port clock

td(FSX)

Delay time, CLKX rising to FSX

td(DX)

Delay time, CLKX rising to DX

tdis(DX)

Disable time, CLKX rising to DX

th(DX)

Hold time, DX valid after CLKX rising edge

–2

tf(SCK)

Fall time, serial port clock

tr(SCK)

Rise time, serial port clock

tw(SCK)

Pulse duration, serial port clock low/high

4H–4

FSX

CLKX

8/16

7/15

th(DX)

tw(SCK)

tc(SCK)

td(FSX)

td(DX)

tdis(DX)

tw(SCK)

tr(SCK)

tf(SCK)

Figure 23. Serial Port Transmit Timing With Internal Clocks and Frames

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