2096E_1 Datasheet, PDF(2/11 Page) Lattice Semiconductor – In-System Programmable SuperFAST™ High Density PLD

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2096E_1 Datasheet, PDF (2/11 Pages) Lattice Semiconductor – In-System Programmable SuperFAST™ High Density PLD

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Functional Block Diagram

Figure 1. ispLSI 2096E Functional Block Diagram

Specifications ispLSI 2096E

Megablock

Generic Logic

Blocks (GLBs)

Input Bus

Output Routing Pool (ORP)

Input Bus

Output Routing Pool (ORP)

I/O 0

I/O 1

I/O 2

I/O 3

I/O 4

I/O 5

I/O 6

I/O 7

I/O 8

I/O 9

I/O 10

I/O 11

I/O 12

I/O 13

I/O 14

I/O 15

TDI/IN 0

TMS/IN 1

TDO

RESET

BSCAN

Global

Routing

Pool

(GRP)

Output Routing Pool (ORP)

Input Bus

Output Routing Pool (ORP)

Input Bus

I/O 63

I/O 62

I/O 61

I/O 60

I/O 59

I/O 58

I/O 57

I/O 56

I/O 55

I/O 54

I/O 53

I/O 52

I/O 51

I/O 50

I/O 49

I/O 48

0917/2096E

the VCCIO pins to a common 5V or 3.3V power supply,

I/O output levels can be matched to 5V or 3.3V compat-

ible voltages. When connected to a 5V supply, the I/O

pins provide PCI-compatible output drive.

Eight GLBs, 32 I/O cells, two dedicated inputs and two

ORPs are connected together to make a Megablock (see

Figure 1). The outputs of the eight GLBs are connected

to a set of 32 universal I/O cells by the two ORPs. Each

ispLSI 2096E device contains three Megablocks.

The GRP has as its inputs, the outputs from all of the

GLBs and all of the inputs from the bi-directional I/O cells.

All of these signals are made available to the inputs of the

GLBs. Delays through the GRP have been equalized to

minimize timing skew.

Programmable Open-Drain Outputs

In addition to the standard output configuration, the

outputs of the ispLSI 2096E are individually program-

mable, either as a standard totem-pole output or an

open-drain output. The totem-pole output drives the

specified Voh and Vol levels, whereas the open-drain

output drives only the specified Vol. The Voh level on the

open-drain output depends on the external loading and

pull-up. This output configuration is controlled by a pro-

grammable fuse. The default configuration when the

device is in bulk erased state is totem-pole configuration.

The open-drain/totem-pole option is selectable through

the Lattice software tools.

Clocks in the ispLSI 2096E device are selected using the

dedicated clock pins. Three dedicated clock pins (Y0, Y1,

Y2) or an asynchronous clock can be selected on a GLB

basis. The asynchronous or Product Term clock can be

generated in any GLB for its own clock.

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