AM3874 datasheet(222/361 Pages) TI

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PLH

PHL

EMUx Pins

Buffer

Inputs

Buffers

AM3874, AM3871

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

www.ti.com

Table 8-13. Switching Characteristics Over Recommended Operating Conditions for STM Trace

(see Figure 8-8)

OPP100/120/166

NO.

PARAMETER

UNIT

MIN

MAX

Pulse duration, EMUx high detected at 50% VOH with 60/40 duty

tw(EMUH50)

4(1)

cycle

tw(EMUH90)

Pulse duration, EMUx high detected at 90% VOH

3.5

Pulse duration, EMUx low detected at 50% VOH with 60/40 duty

tw(EMUL50)

4(1)

cycle

tw(EMUL10)

Pulse duration, EMUx low detected at 10% VOH

3.5

Output skew time, time delay difference between EMUx pins

tsko(EMU)

-2

0.5

configured as trace.

Pulse skew, magnitude of difference between high-to-low (tPHL)

tskp(EMU)

1(1)

and low-to-high (tPLH) propagation delays

tsldp_o(EMU)

Output slew rate EMUx

3.3

V/ns

(1)

This parameter applies to the maximum trace export frequency operating in a 40/60 duty cycle.

Figure 8-8. STM Trace Timing

222

Peripheral Information and Timings

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