AM3892 datasheet(187/299 Pages) TI

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PLH

PHL

EMUx Pins

Buffer

Inputs

Buffers

AM3894

AM3892

www.ti.com

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

Table 8-33. Switching Characteristics Over Recommended Operating Conditions for STM Trace

(see Figure 8-43)

NO.

PARAMETER

MIN

MAX

UNIT

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

tw(EMUxH50)

5-1(1)

cycle

tw(EMUxH90)

Pulse duration, EMUx high detected at 90% VOH

3.5

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

tw(EMUxL50)

5-1(1)

cycle

tw(EMUxL10)

Pulse duration, EMUx low detected at 10% VOH

3.5

Output skew time, time delay difference between EMUx pins

tsko(EMUx)

-500

500

configured as trace.

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

tskp(EMUx)

1(1)

low-to-high (tplh) propagation delays

tsldp_o(EMUx)

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 8-43. STM Trace Timing

8.4.4

IEEE 1149.7 cJTAG

Besides the standard (legacy) JTAG mode of operation, the target debug interface can also be switched to

a compressed JTAG (cJTAG) mode of operation, commonly referred to as IEEE1149.7 standard. An

IEEE1149.7 adapter module runs a 2-pin communication protocol on top of an IEEE1149.1 JTAG TAP.

The debug-IP logic serializes the IEEE1149.1 transactions, using a variety of compression formats, to

reduce the number of pins needed to implement a JTAG debug port. This device implements only a

subset of the IEEE1149.7 protocol; it supports Class 0/1 operation. On this device the cJTAG ID[7:0] is

tied to 0x00.

NOTE

The default setting of the scan port is IEEE 1149.1. A cJTAG emulator connected only to

TCLK and TMS can re-configure the port to cJTAG by scanning in a special command

sequence. For the scan sequence required to switch modes, see the IEEE1149.7

specification.

Peripheral Information and Timings

187

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