Specifications ispLSI 2096VL

2

noise. Device pins can be safely driven to 3.3V signal

levels to support mixed-voltage systems.

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 2096VL 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.

Clocks in the ispLSI 2096VL 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.

A0

A3

A1

A2

B7

B4

B6

B5

Global

Routing

Pool

(GRP)

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

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

TDI/IN 0

TMS/IN 1

RESET

BSCAN

Input Bus

0917/2096VL

Megablock

C7

C6

C5

C4

A4

A5

A6

A7

Output Routing Pool (ORP)

Output Routing Pool (ORP)

Input Bus

Input Bus

B0

B1

B2

B3

Output Routing Pool (ORP)

C3

C2

C1

C0

Output Routing Pool (ORP)

Input Bus

Generic Logic

Blocks (GLBs)

Functional Block Diagram

Figure 1. ispLSI 2096VL Functional Block Diagram

Programmable Open-Drain Outputs

In addition to the standard output configuration, the

outputs of the ispLSI 2096VL 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 is a totem-pole

configuration. The open-drain/totem-pole option is se-

lectable through the ispDesignEXPERT software tools.