ISPXPLD5512MX Просмотр технического описания (PDF) - Lattice Semiconductor

Номер в каталоге

Компоненты Описание

производитель

ISPXPLD5512MX

3.3V, 2.5V and 1.8V In-System Programmable eXpanded Programmable Logic Device XPLD™ Family

Lattice Semiconductor 

Lattice Semiconductor

ispXPLD 5000MX Family Data Sheet

Cascading For Wide Operation

In several modes it is possible to cascade adjacent MFBs to support wider operation. Table 2 details the different

cascading options. There are chains of MFBs in each device which determine those MFBs that are adjacent for the

purposes of cascading. Table 3 indicates these chains. The ispXPLD 5000MX design tools automatically cascade

blocks if required by a particular design.

Table 2. Cascading Modes For Wide Support

Mode

Logic

FIFO

CAM

Cascading Function

Input Width. Allows two MFBs to act as a 136-input block.

Arithmetic. Allow the carry chain to pass between two MFBs.

Memory Width Expansion. Allows MFBs to be cascaded for greater width support.

Memory Width Expansion. Allows up to four MFBs to be cascaded for greater width support.

Table 3. MFB Cascade Chain

Device

ispXPLD 5256MX

ispXPLD 5512MX

ispXPLD 5768MX

ispXPLD 51024MX

MFBs in Cascade Chain

A→B→C→D

H -> G -> F -> E

A→B→C→D→E→F→G→H

P→Ο→N→M→L→K→J→I

D→C→B→A→X→W→V→U→T→S→R→Q

E→F→G→H→I→J→K→L→M→N→O→P

H → G → F → E → D → C → B → A → AF → AE → AD → AC → AB → AA → Z → Y

I→J→K→L→M→N→O→P→Q→R→S→T→U→V→W→X

SuperWIDE Logic Mode

In logic mode, each MFB contains 32 macrocells and a fully populated, programmable AND-array with 160 logic

product terms and four control product terms. The MFB has 68 inputs from the Global Routing Pool, which are

available in both true and complement form for every product term. It is also possible to cascade adjacent MFBs to

create a block with 136 inputs. The four control product terms are used for shared reset, clock, clock enable, and

output enable functions. Figure 3 shows the overall structure of the MFB in logic mode while Figure 4 provides a

more detailed view from the perspective of a macrocell slice.

4

Share Link: