TMS320F2811PBKA datasheet(20/170 Pages) TI

20 / 170 page

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174S – APRIL 2001 – REVISED MARCH 2011

www.ti.com

Table 2-2. Signal Descriptions (continued)

PIN NO.

NAME

I/O/Z(2)

PU/PD(3)

DESCRIPTION

179-BALL

176-PIN

128-PIN

GHH/ZHH

PGF

PBK

JTAG AND MISCELLANEOUS SIGNALS

Oscillator Input – input to the internal

oscillator. This pin is also used to feed an

external clock. The 28x can be operated with

an external clock source, provided that the

proper voltage levels be driven on the

X1/XCLKIN pin. It should be noted that the

X1/XCLKIN

–

X1/XCLKIN pin is referenced to the 1.8-V (or

1.9-V) core digital power supply (VDD), rather

than the 3.3-V I/O supply (VDDIO). A clamping

diode may be used to clamp a buffered clock

signal to ensure that the logic-high level does

not exceed VDD (1.8 V or 1.9 V) or a 1.8-V

oscillator may be used.

–

Oscillator Output

Output clock derived from SYSCLKOUT to be

used for external wait-state generation and as

a general-purpose clock source. XCLKOUT is

either the same frequency, 1/2 the frequency,

or 1/4 the frequency of SYSCLKOUT. At reset,

XCLKOUT

F11

119

–

XCLKOUT = SYSCLKOUT/4. The XCLKOUT

signal can be turned off by setting bit 3

(CLKOFF) of the XINTCNF2 register to 1.

Unlike other GPIO pins, the XCLKOUT pin is

not placed in a high-impedance state during

reset.

Test Pin. Reserved for TI. Must be connected

TESTSEL

A13

134

to ground.

Device Reset (in) and Watchdog Reset (out).

Device reset. XRS causes the device to

terminate execution. The PC will point to the

address contained at the location 0x3FFFC0.

When XRS is brought to a high level,

execution begins at the location pointed to by

the PC. This pin is driven low by the DSP

XRS

160

113

I/O

when a watchdog reset occurs. During

watchdog reset, the XRS pin will be driven low

for the watchdog reset duration of

512 XCLKIN cycles.

The output buffer of this pin is an open-drain

with an internal pullup (100 µA, typical). It is

recommended that this pin be driven by an

open-drain device.

Test Pin. Reserved for TI. On F281x devices,

TEST1 must be left unconnected. On C281x

TEST1

I/O

–

devices, this pin is a “no connect (NC)”

(i.e., this pin is not connected to any circuitry

internal to the device).

Test Pin. Reserved for TI. On F281x devices,

TEST2 must be left unconnected. On C281x

TEST2

I/O

–

devices, this pin is a “no connect (NC)”

(i.e., this pin is not connected to any circuitry

internal to the device).

Introduction

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