TMS320DM6467_09 Datasheet, PDF(350/357 Page) Texas Instruments – Digital Media System-on-Chip

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TMS320DM6467_09 Datasheet, PDF (350/357 Pages) Texas Instruments – Digital Media System-on-Chip

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TMS320DM6467

Digital Media System-on-Chip

SPRS403F â DECEMBER 2007 â REVISED OCTOBER 2009

www.ti.com

7.29 IEEE 1149.1 JTAG

The JTAG(3) interface is used for BSDL testing and emulation of the DM6467 device.

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

exercise the device's boundary scan functionality.

RESET must be released only in order for boundary-scan JTAG to read the variant field of IDCODE

correctly. Other boundary-scan instructions work correctly independent of current state of RESET.

For maximum reliability, DM6467 includes an internal pulldown (IPD) on the TRST pin to ensure 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.

7.29.1 JTAG ID (JTAGID) Register Description(s)

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

HEX ADDRESS RANGE

0x01C4 0028

ACRONYM

Table 7-149. JTAG ID Register

REGISTER NAME

JTAGID JTAG Identification Register

COMMENTS

Read-only. Provides 32-bit

JTAG ID of the device.

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

DM6467 device, the JTAG ID register resides at address location 0x01C4 0028. The register hex value for

DM6467 is: 0x1B77 002F [for Silicon Revision 3.0 and later] and 0x0B77 002F [for Silicon Revision 1.1

and earlier]. For the actual register bit names and their associated bit field descriptions, see Figure 7-96

and Table 7-150.

31-28

VARIANT (4-Bit)

R-000X

27-12

PART NUMBER (16-Bit)

R-1011 0111 0111 0000

11-1

0

MANUFACTURER (11-Bit)

LSB

R-0000 0010 111

R-1

LEGEND: R = Read, W = Write, n = value at reset, X = Silicon Revision dependent

Figure 7-96. JTAG ID Register Description - DM6467 Register Value - 0xXB77 002F

350 Peripheral Information and Electrical Specifications

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