TMS320DM641 datasheet(169/179 Pages) TI

169 / 179 page

JTAG

169

June 2003 − Revised October 2005

SPRS222E

Table 4−82. JTAG ID Register Selection Bit Descriptions

BIT

NAME

DESCRIPTION

31:28

VARIANT

Variant (4-Bit) value. DM641/DM640 value: 0000.

27:12

PART NUMBER

Part Number (16-Bit) value. DM641/DM640 value: 0000 0000 0111 1001.

11−1

MANUFACTURER

Manufacturer (11-Bit) value. DM641/DM640 value: 0000 0010 111.

LSB

LSB. This bit is read as a “1” for DM641/DM640.

4.19.2

JTAG Peripheral Register Description(s)

Table 4−83. JTAG ID Register

HEX ADDRESS RANGE

ACRONYM

COMMENTS

01B3 F008

JTAGID

JTAG Identification Register

Read-only. Provides 32-bit

JTAG ID of the device.

4.19.3

JTAG Test-Port Electrical Data/Timing

Table 4−84. Timing Requirements for JTAG Test Port (see Figure 4−67)

NO.

−400

−500

−600

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

Table 4−85. Switching Characteristics Over Recommended Operating Conditions for JTAG Test Port

(see Figure 4−67)

NO.

PARAMETER

−400

−500

−600

UNIT

MIN

MAX

td(TCKL-TDOV)

Delay time, TCK low to TDO valid

TCK

TDO

TDI/TMS/TRST

Figure 4−67. JTAG Test-Port Timing

TMS320DM641 Datasheet(PDF) 169 Page - Texas Instruments

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