TMS320VC33 datasheet(37/53 Pages) TI2

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TRST

Header Dimensions:

Pin-to-pin spacing, 0.100 inch (X,Y)

Pin width, 0.025-inch square post

Pin length, 0.235-inch nominal

no pin (key)

(A)

GND

EMU1

TMS

TDI

PD (V

)

TDO

TCK_RET

TCK

EMU0

SM320VC33, SMJ320VC33

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SGUS034F – FEBRUARY 2001 – REVISED JUNE 2015

While the corresponding female position on the cable connector is plugged to prevent improper connection, the cable

lead for pin 6 is present in the cable and is grounded, as shown in the schematics and wiring diagrams in this data

sheet.

Figure 32. 14-Pin Header Signals and Header Dimensions

Table 7. 14-Pin Header Signal Descriptions

EMULATOR(1)

TARGET(1) STATE

SIGNAL

DESCRIPTION

STATE

TMS(2)

Test mode select

TDI

Test data input

TDO

Test data output

TCK

Test clock. TCK is a 10.368-MHz clock source from the emulation cable

pod. This signal can be used to drive the system test clock

TRST(3)

Test reset

EMU0(2)(4)

Emulation pin 0

I/O

EMU1(2)(4)

Emulation pin 1

I/O

PD(VCC)

Presence detect. Indicates that the emulation cable is connected and that

the target is powered up. PD should be tied to VCC in the target system.

TCK_RET

Test clock return. Test clock input to the emulator. May be a buffered or

unbuffered version of TCK.

GND

Ground

—

(1)

I = Input; O = Output

(2)

Use 1- to 50-k

Ω pullups for TMS, EMU0, and EMU1.

(3)

Use 1- to 50-k

Ω pulldown for TRST. Do not use pullup resistors on TRST: it has an internal pulldown device. In a low-noise

environment, TRST can be left floating. In a high-noise environment, an additional pulldown resistor may be needed. (The size of this

resistor should be based on electrical current considerations.)

(4)

EMU0 and EMU1 are I/O drivers configured as open-drain (open-collector) drivers. They are used as bidirectional signals for emulation

global start and stop.

Although other headers can be used, recommended parts include: straight header, unshrouded DuPont™

connector systems part numbers:

•

65610–114

•

65611–114

•

67996–114

•

67997–114

8.2.15 JTAG Emulator Cable Pod Logic

Figure 33 shows a portion of the emulator cable pod. The functional features of the pod are as follows:

•

Signals TDO and TCK_RET can be parallel-terminated inside the pod if required by the application. By

default, these signals are not terminated.

•

Signal TCK is driven with a 74LVT240 device. Because of the high-current drive (32 mA IOL/IOH), this signal

can be parallel-terminated. If TCK is tied to TCK_RET, the parallel terminator in the pod can be used.

•

Signals TMS and TDI can be generated from the falling edge of TCK_RET, according to the bus slave device

timing rules.

•

Signals TMS and TDI are series-terminated to reduce signal reflections.

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