REV. 0

–8–

ADSP-2186M

Terminating Unused Pins

The following table shows the recommendations for terminating unused pins.

Pin Terminations

I/O 3-State

Reset

Hi-Z

*

Pin Name

(Z)

State

Caused By

Unused Configuration

XTAL

I

I

Float

CLKOUT

O

O

Float

A13:1 or

O (Z)

Hi-Z

BR, EBR

Float

IAD12:0

I/O (Z)

Hi-Z

IS

Float

A0

O (Z)

Hi-Z

BR, EBR

Float

D23:8

I/O (Z)

Hi-Z

BR, EBR

Float

D7 or

I/O (Z)

Hi-Z

BR, EBR

Float

IWR

I

I

High (Inactive)

D6 or

I/O (Z)

Hi-Z

BR, EBR

Float

IRD

II

BR, EBR

High (Inactive)

D5 or

I/O (Z)

Hi-Z

Float

IAL

I

I

Low (Inactive)

D4 or

I/O (Z)

Hi-Z

BR, EBR

Float

IS

I

I

High (Inactive)

D3 or

I/O (Z)

Hi-Z

BR, EBR

Float

IACK

Float

D2:0 or

I/O (Z)

Hi-Z

BR, EBR

Float

IAD15:13

I/O (Z)

Hi-Z

IS

Float

PMS

O (Z)

O

BR, EBR

Float

DMS

O (Z)

O

BR, EBR

Float

BMS

O (Z)

O

BR, EBR

Float

IOMS

O (Z)

O

BR, EBR

Float

CMS

O (Z)

O

BR, EBR

Float

RD

O (Z)

O

BR, EBR

Float

WR

O (Z)

O

BR, EBR

Float

BR

I

I

High (Inactive)

BG

O (Z)

O

EE

Float

BGH

O

O

Float

IRQ2/PF7

I/O (Z)

I

Input = High (Inactive) or Program as Output, Set to 1, Let Float

IRQL1/PF6

I/O (Z)

I

Input = High (Inactive) or Program as Output, Set to 1, Let Float

IRQL0/PF5

I/O (Z)

I

Input = High (Inactive) or Program as Output, Set to 1, Let Float

IRQE/PF4

I/O (Z)

I

Input = High (Inactive) or Program as Output, Set to 1, Let Float

SCLK0

I/O

I

Input = High or Low, Output = Float

RFS0

I/O

I

High or Low

DR0

I

I

High or Low

TFS0

I/O

I

High or Low

DT0

O

O

Float

SCLK1

I/O

I

Input = High or Low, Output = Float

RFS1/

IRQ0

I/O

I

High or Low

DR1/FI

I

I

High or Low

TFS1/

IRQ1

I/O

I

High or Low

DT1/FO

O

O

Float

EE

I

I

Float

EBR

I

I

Float

EBG

O

O

Float

ERESET

I

I

Float

EMS

O

O

Float

EINT

I

I

Float

ECLK

I

I

Float

ELIN

I

I

Float

ELOUT

O

O

Float

NOTES

*Hi-Z = High Impedance.

1. If the CLKOUT pin is not used, turn it OFF, using CLKODIS in SPORT0 autobuffer control register.

2. If the Interrupt/Programmable Flag pins are not used, there are two options: Option 1: When these pins are configured as INPUTS at reset and function as inter-

rupts and input flag pins, pull the pins High (inactive). Option 2: Program the unused pins as OUTPUTS, set them to 1, prior to enabling interrupts, and let pins float.

3. All bidirectional pins have three-stated outputs. When the pin is configured as an output, the output is Hi-Z (high impedance) when inactive.

4. CLKIN,

RESET, and PF3:0/MODE D:A are not included in the table because these pins must be used.