8

ATC25 Summary

1306DS–CBIC–09/02

Atmel Compiled

Megacell Library

The Atmel Compiled Megacell Library enables compilation of megacells for the func-

tions Synchronous RAM, High-range Synchronous RAM, Asynchronous RAM,

Asynchronous Dual-port RAM, Asynchronous Two-port RAM and Synchronous ROM,

according to the user’s precise requirements.

The Atmel megacells can be instanced as often as required in designs and can be used

in parallel with cells from all other Atmel CBIC libraries. All the megacell representations

required for schematic entry, simulation, place and route, layout generation, and verifi-

cation are created automatically.

Compiled Synchronous

RAM Megacells

The Atmel Synchronous RAM compiler has bidirectional or separate I/O ports, and can

be configured in multi-bank form, with a maximum of four banks.

The range of permitted Synchronous RAM megacell configurations is as follows:

Number of bits

128, .. 144K bits

Number of words

32, .. 8K

Word Size

4, .. 36 bits

The following table shows the range of performances for particular Synchronous RAM

configurations under typical conditions.

Compiled High-range

Synchronous RAM

Megacells

The Atmel High-range Synchronous RAM compiler has bidirectional or separate I/O

ports, and can be configured in multi-bank form, with a maximum of four banks.

The range of permitted High-range Synchronous RAM megacell configurations is as

follows:

Number of bits

16K, .. 2.25M bits

Number of words

2K, .. 32K

Word Size

8, .. 72 bits

The following table shows the range of performances for particular High-range Synchro-

nous RAM configurations under typical conditions.

Configuration

1K x 8 (8K bits)

2K x 16 (32K bits)

4K x 32 (128K bits)

Density (Kbits/mm

515862

Frequency (MHz)

305

242

169

Dynamic Power

(mW/MHz)

0.17

0.36

0.73

Configuration

8K x 8 (64K bits)

16K x 16 (256K bits)

32K x 32 (1M bits)

Density (Kbits/mm

808487

Frequency (MHz)

186

120

71

Dynamic Power

(mW/MHz)

0.29

0.55

1.22