PEX8648 datasheet(3/4 Pages) PLX

3 / 4 page

Preliminary - PLX Confidential

CPU

x16

Memory

x16

Endpoint

Chipset

Endpoint

PCIe Gen1 or PCIe Gen2 slots

PEX 8648

Figure 3. Fan-in/out Usage

Communications Systems

The PEX 8648 can also be utilized in communications

applications. Figure 4 shows a PEX 8648 being used in a

router to connect multiple endpoints in a line card to the

control module using PowerPC. The link-widths for each

module can be configured as required. The peer-to-peer

communication feature of the PEX 8648 allows the

endpoints to communicate with each other without any

intervention or management by the host.

Memory

PowerPC

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

Control

Module

Line Card

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

End

Point

PEX 8648

x8 or x4

Figure 4. Router Usage

Backplane Communication

With 48 lanes and 12 ports, the PEX 8648 is well suited

for backplane applications requiring high connectivity (a

large number of ports). Figure 5 represents an ATCA or

MicroTCA backplane application with two switch fabric

blades and multiple AMC blades. In this example, two

PEX 8648s provide peer-to-peer data exchange for up to

20 AMC blades connecting to the switch fabric. The

PEX 8648 utilizes its NT port to isolate the hosts on the

switch fabrics and the remaining 10 downstream ports

on each switch are used to fan-out to the 20 AMC blades

(or 10 AMC Carrier Modules).

10-20 AMC or 10 AMC

Carrier Modules

Fabric

Backplane

To other

Fabric

PEX 8648

CPU

Figure 5. ATCA/MicroTCA Backplane Usage

Fail-Over Storage Systems with Dual Cast

The PEX 8648’s Dual Cast feature proves to be very

useful in storage systems. In the example shown in

Figure 6, the Dual Cast feature enables the PEX 8648 to

copy data coming from the host to two downstream ports

(see yellow traffic patterns) in one transaction as

opposed to having to execute two separate transactions

to send data to the redundant chassis. By offloading the

task of backing up data onto the secondary system,

processor and system performance is enhanced. The

PEX 8648’s NT port is used to isolate the backup system

from the primary system.

8 Disk Chassis

CPU

Memory

Chipset

CPU

Memory

Chipset

Backup

System

PEX 8648

PEX 8616

All

x8s

All

x8s

Figure 6. Dual Cast in Storage Systems

PEX8648 Arkusz danych(PDF) 3 Page - PLX Technology

PEX8648 Arkusz danych(HTML) 3 Page - PLX Technology

Html Pages

1 2 3 4

Arkusz danych Pobierz

Link URL