TMS320F2812 datasheet(103/170 Pages) TI

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XCLKOUT

(A)(B)

XCLKIN

(A)

C10

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

www.ti.com

SPRS174S – APRIL 2001 – REVISED MARCH 2011

6.14.2 Output Clock Characteristics

Table 6-10. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)(1)(2)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

tc(XCO)

Cycle time, XCLKOUT

6.67(3)

tf(XCO)

Fall time, XCLKOUT

tr(XCO)

Rise time, XCLKOUT

tw(XCOL)

Pulse duration, XCLKOUT low

H – 2

H + 2

tw(XCOH)

Pulse duration, XCLKOUT high

H – 2

H + 2

PLL lock time(4)

131072tc(CI)

(1)

A load of 40 pF is assumed for these parameters.

(2)

H = 0.5tc(XCO)

(3)

The PLL must be used for maximum frequency operation.

(4)

This parameter has changed from 4096 XCLKIN cycles in the earlier revisions of the silicon.

The relationship of XCLKIN to XCLKOUT depends on the divide factor chosen. The waveform relationship shown in

Figure 6-10 is intended to illustrate the timing parameters only and may differ based on configuration.

XCLKOUT configured to reflect SYSCLKOUT.

Figure 6-10. Clock Timing

6.15 Reset Timing

Table 6-11. Reset (XRS) Timing Requirements(1)

MIN

NOM

MAX

UNIT

tw(RSL1)

Pulse duration, stable XCLKIN to XRS high

8tc(CI)

cycles

tw(RSL2)

Pulse duration, XRS low

Warm reset

8tc(CI)

cycles

Pulse duration, reset pulse generated by

tw(WDRS)

512tc(CI)

cycles

watchdog

Delay time, address/data valid after XRS

td(EX)

32tc(CI)

cycles

high

tOSCST

(2)

Oscillator start-up time

tsu(XPLLDIS)

Setup time for XPLLDIS pin

16tc(CI)

cycles

th(XPLLDIS)

Hold time for XPLLDIS pin

16tc(CI)

cycles

th(XMP/MC)

Hold time for XMP/MC pin

16tc(CI)

cycles

th(boot-mode)

Hold time for boot-mode pins

2520tc(CI)

(3)

cycles

(1)

If external oscillator/clock source are used, reset time has to be low at least for 1 ms after VDD reaches 1.5 V.

(2)

Dependent on crystal/resonator and board design.

(3)

The boot ROM reads the password locations. Therefore, this timing requirement includes the wakeup time for flash. See the

TMS320x281x DSP Boot ROM Reference Guide (literature number SPRU095) and the TMS320x281x DSP System Control and

Interrupts Reference Guide (literature number SPRU078) for further information.

Electrical Specifications

103

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