AM3874 Datasheet, PDF (210/345 Pages) Texas Instruments – AM387x Sitara ARM Microprocessors (MPUs)

AM3874, AM3872, AM3871
SPRS695 – SEPTEMBER 2011
www.ti.com
Table 8-11. Switching Characteristics Over Recommended Operating Conditions for STM Trace
(see Figure 8-8)
NO.
PARAMETER
OPP100
UNIT
MIN
MAX
1
t_w(EMUH50)
t_w(EMUH90)
2
t_w(EMUL50)
t_w(EMUL10)
3 t_sko(EMU)
Pulse duration, EMUx high detected at 50% V_OH with 60/40 duty
cycle
Pulse duration, EMUx high detected at 90% V_OH
Pulse duration, EMUx low detected at 50% V_OH with 60/40 duty
cycle
Pulse duration, EMUx low detected at 10% V_OH
Output skew time, time delay difference between EMUx pins
configured as trace.
4 ⁽¹⁾
3.5
4 ⁽¹⁾
3.5
–500
ns
ns
ns
ns
500 ps
t_skp(EMU)
t_{sldp_o(EMU)}
Pulse skew, magnitude of difference between high-to-low (t_PHL)
and low-to-high (t_PLH) propagation delays
Output slew rate EMUx
1⁽¹⁾ ns
3.3
V/ns
(1) This parameter applies to the maximum trace export frequency operating in a 40/60 duty cycle.
Buffer
Inputs
Buffers
EMUx Pins
B
A
C
A
t_PLH
B
t_PHL
1
2
3
C
Figure 8-8. STM Trace Timing
210 Peripheral Information and Timings
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