INFORMATION ADVANCE

TMS320TCI6618

Communications Infrastructure KeyStone SoC

SPRS688—February 2011

www.ti.com

 

7.34.2 Trace

The TCI6618 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 ‘‘Related Documentation from Texas Instruments’’ on page 59.

7.34.2.1 Trace Electrical Data/Timing

Table 7-84

Trace Switching Characteristics (1)

 

 

 

(see Figure 7-60)

 

 

 

 

 

 

 

 

 

 

 

 

No.

 

 

Parameter

Min

Max

Unit

1

tw(DPnH)

 

Pulse duration, DPn/EMUn high

2.4

 

ns

1

tw(DPnH)90%

Pulse duration, DPn/EMUn high detected at 90% Voh

1.5

 

ns

2

tw(DPnL)

 

Pulse duration, DPn/EMUn low

2.4

 

ns

2

tw(DPnL)10%

Pulse duration, DPn/EMUn low detected at 10% Voh

1.5

 

ns

3

tsko(DPn)

 

Output skew time, time delay difference between DPn/EMUn pins configured as trace

-500

500

ps

 

tskp(DPn)

 

Pulse skew, magnitude of difference between high-to-low (tphl) and low-to-high (tplh) propagation delays.

 

600

ps

 

tσλδπ_ο(DPn)

Output slew rate DPn/EMUn

3.3

 

V/ns

End of Table 7-84

 

 

 

 

 

 

 

 

 

1 Over recommended operating conditions.

 

 

 

Figure 7-60

Trace Timing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TPLH

 

 

 

 

 

 

 

 

 

 

 

 

 

TPHL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

3

C

7.34.3 IEEE 1149.1 JTAG

The JTAG interface is used to support boundary scan and emulation of the device. The boundary scan supported allows for an asynchronous TRST 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).

194

Copyright 2011 Texas Instruments Incorporated

TMS320TCI6618

Communications Infrastructure KeyStone SoC

www.ti.com

SPRS688—February 2011

 

7.34.3.1 IEEE 1149.1 JTAG Compatibility Statement

For maximum reliability, the TCI6618 DSP includes an internal pulldown (IPD) on the TRST pin to ensure that TRST will always be asserted upon power up and the DSP's internal emulation logic will always be properly initialized when this pin is not routed out. JTAG controllers from Texas Instruments actively drive TRST high. However, some third-party JTAG controllers may not drive TRST high but expect the use of an external pullup resistor on TRST. When using this type of JTAG controller, assert TRST to initialize the DSP after powerup and externally drive TRST high before attempting any emulation or boundary scan operations.

7.34.3.2 JTAG Electrical Data/Timing

Table 7-85 JTAG Test Port Timing Requirements

(see Figure 7-61)

No.

 

 

Min

Max

Unit

1

tc(TCK)

Cycle time, TCK

20

 

ns

1a

tw(TCKH)

Pulse duration, TCK high (40% of tc)

8

 

ns

 

 

 

 

 

 

1b

tw(TCKL)

Pulse duration, TCK low(40% of tc)

8

 

ns

 

 

 

 

 

 

3

tsu(TDI-TCK)

input setup time, TDI valid to TCK high

2

 

ns

 

 

 

 

 

 

3

tsu(TMS-TCK)

input setup time, TMS valid to TCK high

2

 

ns

 

 

 

 

 

 

4

th(TCK-TDI)

input hold time, TDI valid from TCK high

10

 

ns

 

 

 

 

 

 

4

th(TCK-TMS)

input hold time, TMS valid from TCK high

10

 

ns

 

 

 

 

 

 

End of Table 7-85

 

 

 

 

 

 

 

 

 

 

Table 7-86

JTAG Test Port Switching Characteristics (1)

 

 

 

(see Figure 7-61)

 

 

 

 

 

 

 

 

 

 

 

 

No.

 

 

Parameter

Min

Max

Unit

2

td(TCKL-TDOV)

Delay time, TCK low to TDO valid

 

8

ns

End of Table 7-86

 

 

 

 

 

 

 

 

 

1 Over recommended operating conditions.

 

 

 

Figure 7-61 JTAG Test-Port Timing

1

1a

1b

 

 

TCK

2

TDO

4

3

TDI / TMS

ADVANCE INFORMATION

Copyright 2011 Texas Instruments Incorporated

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