AFS090 datasheet(159/334 Pages) MICROSEMI

159 / 334 page

Fusion Family of Mixed Signal FPGAs

R e visio n 2

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Hot-Swap Support

Hot-swapping (also called hot plugging) is the operation of hot insertion or hot removal of a card in (or

from) a powered-up system. The levels of hot-swap support and examples of related applications are

described in Table 2-74. The I/Os also need to be configured in hot insertion mode if hot plugging

compliance is required.

Table 2-74 • Levels of Hot-Swap Support

Hot

Swapping

Level

Description

Power

Applied

to Device Bus State

Card

Ground

Connection

Device

Circuitry

Connected

to Bus Pins

Example of

Application with

Cards that Contain

Fusion Devices

Compliance of

Fusion Devices

Cold-swap

–

System and card with

Microsemi FPGA chip

are powered down,

then card gets

plugged into system,

then power supplies

are turned on for

system but not for

FPGA on card.

Compliant I/Os

can but do not

have to be set to

hot insertion

mode.

Hot-swap

while reset

Yes

Held in

reset state

Must be made

and

maintained for

1 ms before,

during, and

after insertion/

removal

–

In PCI hot plug

specification, reset

control circuitry

isolates the card

busses until the card

supplies are at their

nominal operating

levels and stable.

Compliant I/Os

can but do not

have to be set to

hot insertion

mode.

Hot-swap

while bus

idle

Yes

Held idle

(no ongoing

I/O

processes

during

insertion/re

moval)

Same as

Level 2

Must remain

glitch-free

during

power-up or

power-down

Board bus shared

with card bus is

"frozen," and there is

no toggling activity on

bus. It is critical that

the logic states set on

the bus signal do not

get disturbed during

card

insertion/removal.

Compliant with

cards with two

levels of staging.

I/Os have to be

set to hot

insertion mode.

Hot-swap on

an active

bus

Yes

Bus may

have active

I/O

processes

ongoing,

but device

being

inserted or

removed

must be

idle.

Same as

Level 2

Same as

Level 3

There is activity on

the system bus, and it

is critical that the logic

states set on the bus

signal do not get

disturbed during card

insertion/removal.

Compliant with

cards with two

levels of staging.

I/Os have to be

set to hot

insertion mode.

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