Multicore Fixed and Floating-Point System-on-Chip
Copyright 2012 Texas Instruments Incorporated
TMS320C6670 Peripheral Information and Electrical Specifications
217
SPRS689D—March 2012
TMS320C6670
7.34.2 Trace
The C6670 device supports trace. Trace is a debug technology that provides a detailed, historical account of
application code execution, timing, and data accesses. Trace collects, compresses, and exports debug information
for analysis. Trace works in real-time and does not impact the execution of the system.
For more information on board design guidelines for trace advanced emulation, see the
Emulation and Trace
Headers Technical Reference
in
2.9 ‘‘Related Documentation from Texas Instruments’’ on page 66
7.34.2.1 Trace Electrical Data/Timing
Figure 7-59
Trace Timing
7.34.3 IEEE 1149.1 JTAG
The JTAG (Joint Test Action Group) interface is used to support boundary scan and emulation of the device. The
boundary scan supported allows for an asynchronous TRST (test reset) and only the 5 baseline JTAG signals (e.g.,
no EMU[1:0]) required for boundary scan. Most interfaces on the device follow the Boundary Scan Test
Specification (IEEE1149.1), while all of the SerDes (SRIO and SGMII) support the AC-coupled net test defined in
AC-Coupled Net Test Specification (IEEE1149.6).
It is expected that all compliant devices are connected through the same JTAG interface, in daisy-chain fashion, in
accordance with the specification. The JTAG interface uses 1.8-V LVCMOS buffers, compliant with the
Power
Supply Voltage and Interface Standard for Nonterminated Digital Integrated Circuit Specification
(EAI/JESD8-5).
Table 7-85
Trace Switching Characteristics
(see
No.
Parameter
Min
Max Unit
1
t
w
(DPnH)
Pulse duration, DPn/EMUn high
2.4
ns
1
t
w
(DPnH)90% Pulse duration, DPn/EMUn high detected at 90% Voh
1.5
ns
2
t
w
(DPnL)
Pulse duration, DPn/EMUn low
2.4
ns
2
t
w
(DPnL)10%
Pulse duration, DPn/EMUn low detected at 10% Voh
1.5
ns
3
t
sko
(DPn)
Output skew time, time delay difference between DPn/EMUn pins configured as trace
-1
1
ns
t
skp
(DPn)
Pulse skew, magnitude of difference between high-to-low (tphl) and low-to-high (tplh) propagation delays.
600
ps
t
sldp_o
(DPn)
Output slew rate DPn/EMUn
3.3
V/ns
End of Table 7-85
C
T
PLH
A
B
3
1
2
T
PHL
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