TMS320VC5420 datasheet(14/77 Pages) TI

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TMS320VC5420

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS080C – MARCH 1999 – REVISED APRIL 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

Signal Descriptions (Continued)

NAME

DESCRIPTION

TYPE†

SUPPLY PINS (CONTINUED)

VSSA

Analog ground. Dedicated ground for the PLL. VSSA can be connected to VSS if digital and analog grounds are

not separated.

TEST PIN

TEST#

No connection

EMULATION/TEST PINS

TCK‡§

Standard test clock. This is normally a free-running clock signal with a 50% duty cycle. Changes on the test

access port (TAP) of input signals TMS and TDI are clocked into the TAP controller, instruction register, or

selected test-data register on the rising edge of TCK. Changes at the TAP output signal (TDO) occur on the falling

edge of TCK.

TDI‡

Test data input. Pin with an internal pullup device. TDI is clocked into the selected register (instruction or data)

on a rising edge of TCK.

TDO

Test data pin. The contents of the selected register is shifted out of TDO on the falling edge of TCK. TDO is in

high-impedance state except when the scanning of data is in progress. These pins are placed into high-im-

pedance state when OFF is low.

TMS‡

Test mode select. Pin with internal pullup device. This serial control input is clocked into the TAP controller on

the rising edge of TCK.

TRST||

Test reset. When high, TRST gives the scan system control of the operations of the device. If TRST is driven low,

the device operates in its functional mode and the emulation signals are ignored. Pin with internal pulldown

device.

EMU0

I/O/Z

Emulator interrupt 0 pin. When TRST is driven low, EMU0 must be high for the activation of the EMU1/OFF

condition. When TRST is driven high, EMU0 is used as an interrupt to or from the emulator system and is defined

as I/O.

EMU1/OFF

I/O/Z

Emulator interrupt 1 pin. When TRST is driven high, EMU1/OFF is used as an interrupt to or from the emulator

system and is defined as I/O. When TRST transitions from high to low, then EMU1 operates as OFF. EMU/OFF

= 0 puts all output drivers into the high-impedance state.

Note that OFF is used exclusively for testing and emulation purposes (and not for multiprocessing applications).

Therefore, for the OFF condition, the following conditions apply:

TRST = 0, EMU0 = 1, EMU1 = 0

† I = Input, O = Output, S = Supply, Z = High Impedance

‡ This pin has an internal pullup resistor.

§ These pins have Schmitt trigger inputs.

¶ This pin has an internal bus holder controlled by way of the BSCR register in subchip A.

# This pin is used by Texas Instruments for device testing and should be left unconnected.

|| This pin has an internal pulldown resistor.

TMS320VC5420 Datasheet(PDF) 14 Page - Texas Instruments

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