SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

IEEE 1149.1 JTAG compatibility statement

The TMS320C6711D DSP requires that both TRST and RESET resets be asserted upon power up to be properly initialized. While RESET initializes the DSP core, TRST initializes the DSP’s emulation logic. Both resets are required for proper operation.

Note: TRST is synchronous and must be clocked by TCLK; otherwise, BSCAN may not respond as expected after TRST is asserted.

While both TRST and RESET need to be asserted upon power up, only RESET needs to be released for the DSP to boot properly. TRST may be asserted indefinitely for normal operation, keeping the JTAG port interface and DSP’s emulation logic in the reset state. TRST only needs to be released when it is necessary to use a JTAG controller to debug the DSP or exercise the DSP’s boundary scan functionality.

The TMS320C6711D 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.

Following the release of RESET, the low-to-high transition of TRST must be “seen” to latch the state of EMU1 and EMU0. The EMU[1:0] pins configure the device for either Boundary Scan mode or Emulation mode. For more detailed information, see the terminal functions section of this data sheet.

Note: The DESIGN−WARNING section of the TMS320C6711D BSDL file contains information and constraints regarding proper device operation while in Boundary Scan Mode.

For more detailed information on the C6711D JTAG emulation, see the TMS320C6000 DSP Designing for JTAG Emulation Reference Guide (literature number SPRU641).

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Motorola TMS320C6711D warranty Ieee 1149.1 Jtag compatibility statement