TMS320DM647 datasheet(174/181 Pages) TI

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TMS320DM647

TMS320DM648

SPRS372F – JANUARY 2010 – REVISED SEPTEMBER 2009

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6.25 IEEE 1149.1 JTAG

The JTAG(2) interface is used for BSDL testing and emulation of the device.

TRST needs to be released only when it is necessary to use a JTAG controller to debug the device or

exercise the device's boundary scan functionality. Note: TRST is synchronous and must be clocked by

TCK; otherwise, the boundary scan logic may not respond as expected after TRST is asserted.

For maximum reliability, the device includes an internal pulldown (IPD) on the TRST pin to make certain

that TRST will always be asserted upon power up and the device's internal emulation logic will always be

properly initialized.

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 a pullup resistor on TRST.

When using this type of JTAG controller, assert TRST to initialize the device after powerup and externally

drive TRST high before attempting any emulation or boundary scan operations.

6.25.1 JTAG Peripheral Register Description(s) - JTAG ID Register

Table 6-97. JTAG ID Register

HEX ADDRESS RANGE

ACRONYM

COMMENTS

Read-only. Provides 32-bit

0x0204 9018

JTAGID

JTAG Identification Register

JTAG ID of the device.

(2)

IEEE Standard 1149.1-1990 Standard-Test-Access Port and Boundary Scan Architecture.

The JTAG ID register is a read-only register that identifies to the customer the JTAG/Device ID. The JTAG

ID register resides at address location 0x0204 9018. The register hex value is: 0x0B77 A02F . For the

actual register bit names and their associated bit field descriptions, see Figure 6-56 and Table 6-98.

Figure 6-56. JTAGID Register (0x0204 9018)

31-28

27-12

11-1

VERSION

PART NUMBER (16-Bit)

MANUFACTURER (11-Bit)

LSB

R-0001

R-1011 0111 0111 1010

R-0000 0010 111

R-1

LEGEND: R = Read, W = Write, n = value at reset

Table 6-98. JTAGID Register Selection Bit Descriptions

BIT

NAME

DESCRIPTION

31:28

VERSION

Silicon version value: 0001.

27:12

PART NUMBER

Part Number (16-Bit) value: 1011 0111 0111 1010.

11-1

MANUFACTURER

Manufacturer (11-Bit) value: 0000 0010 111.

LSB

LSB. This bit is read as a 1.

6.25.2 JTAG Electrical Data/Timing

Table 6-99. Timing Requirements for JTAG Test Port (see Figure 6-57)

720, 800, 900, 1100

NO.

UNIT

MIN

MAX

tc(TCK)

Cycle time, TCK

tsu(TDIV-TCKH)

Setup time, TDI/TMS/TRST valid before TCK high

th(TCKH-TDIV)

Hold time, TDI/TMS/TRST valid after TCK high

174

Peripheral Information and Electrical Specifications

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