AX2000 datasheet(30/262 Pages) MICROSEMI

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Detailed Specifications

2- 16

R e v i sio n 1 8

I/O Clusters

Each I/O cluster incorporates two I/O modules, four RX modules, two TX modules, and a buffer module.

In turn, each I/O module contains one Input Register (InReg), one Output Register (OutReg), and one

Enable Register (EnReg) (Figure 2-5).

Using an I/O Register

To access the I/O registers, registers must be instantiated in the netlist and then connected to the I/Os.

Usage of each I/O register (register combining) is individually controlled and can be selected/deselected

using the PinEditor tool in the Designer software. I/O register combining can also be controlled at the

device level, affecting all I/Os. Please note, the I/O register option is deselected by default in any given

design.4

In addition, Designer software provides a global option to enable/disable the usage of registers in the

I/Os. This option is design-specific. The setting for each individual I/O overrides this global option.

Furthermore, the global set fuse option in the Designer software, when checked, causes all I/O registers

to output logic High at device power-up.

Figure 2-5 •

I/O Cluster Interface

EnReg

DIN

YOUT

DCIN

OutReg

DIN

YOUT

InReg

I/O Cluster

OEP

UOP

UIP

Programmable Delay

Slew Rate

I/O

OEN

UON

UIN

Drive Strength

P PAD

N PAD

Routed Input Track

Output Track

Routed Input Track

Output Track

Routed Input Track

Output Track

EnReg

DIN

YOUT

DCIN

OutReg

DIN YOUT

InReg

Routed Input Track

Output Track

Programmable Delay

Slew Rate

I/O

Drive Strength

VREF

Please note that register combining for multi fanout nets is not supported.

AX2000 Datasheet(PDF) 30 Page - Microsemi Corporation

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