All trademarks mentioned in this document

are trademarks of their respective owners.

Copyright 1999-2007 DCD – Digital Core Design. All Rights Reserved.

http://www.DigitalCoreDesign.com

http://www.dcd.pl

PERFORMANCE

The following table gives a survey about

the Core area and performance in the

ALTERA® devices after Place & Route:

Device

Speed

grade

Logic Cells

CYCLONE

-6

1834

58 MHz

STRATIX

-5

1834

60 MHz

MERCURY

-5

1808

61 MHz

APEX II

-7

1849

50 MHz

APEX20KC

-7

1809

46 MHz

APEX20KE

-1

1809

42 MHz

ACEX1K

-1

1785

34 MHz

FLEX10KE

-1

1785

32 MHz

Core performance in ALTERA® devices

IMPROVEMENT

For user the most important is application

speed improvement. The most commonly

used arithmetic functions and theirs improve-

ment are shown in table below. Improvement

was computed as {M68HC11 clock periods}

divided by {DF6811CPU clock periods} re-

quired to execute an identical function. More

details are available in core documentation.

Function

Improve-

ment

8-bit addition (immediate data)

4

8-bit addition (direct addressing)

4

8-bit addition (indirect addressing)

4

8-bit subtraction (immediate data)

4

8-bit subtraction (direct addressing)

4

8-bit subtraction (indirect addressing)

4

16-bit addition (immediate data)

5,3

16-bit addition (direct addressing)

5

16-bit addition (indirect addressing

4,8

16-bit subtraction (immediate data)

5,3

16-bit subtraction (direct addressing)

5

16-bit subtraction (indirect addressing

4,8

Multiplication

10

Fractional division

14,9

Integer division

16.4

DF68XX FAM I LY O V ERVI EW

The main features of each DF68XX family member have been summarized in table below. It gives

a briefly member characterization helping user to select the most suitable IP Core for its application.

User can specify its own peripheral set (including listed below and the others) and requests the core

modifications.

Design

DF6805

4.1

64k

64k

-

7

7

-

-

*

2/2*

1*

*

4

+

*

-

6 700

DF6808

3.2

64k

64k

-

7

7

-

-

*

2/2*

1*

*

4

*

-

8 900

DF6811

4.4

64k

16M

-

20

17

1*

*

5/3*

1*

*

4

*

*

*

12 000

DF6811CPU

4.4

64k

16M

-

3

3

+

1*

*

+

+

+

+

+

+

+

6 500

DF68XX family of High Performance Microcontroller Cores

+ optional

* configurable