PEX 8648-BB50BC F PLX Technology, PEX 8648-BB50BC F Datasheet - Page 3

• Manufacturer Part Number: PEX 8648-BB50BC F
• Description: Peripheral Drivers & Components (PCIs) 48 Lane, 12 Port PCI Express Gen 2 Switch
• Manufacturer: PLX Technology

Specifications of PEX 8648-BB50BC F

• Maximum Power Dissipation: 3.7 W
• Mounting Style: SMD/SMT
• Propagation Delay Time: 140 ns
• Package / Case: HFCBGA-676
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
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
Endpoint
Endpoint
Endpoint
Endpoint
Line Card
Point
Point
Point
Point
Point
Point
Point
Point
End
End
End
End
End
End
End
End
Control
Module
Endpoint
Endpoint
Endpoint
Endpoint
Figure 3. Fan-in/out Usage
Figure 4. Router Usage
x16
PCIe Gen1 or PCIe Gen2 slots
Point
Point
Point
Point
End
End
End
End
x8
PowerPC
PowerPC
PowerPC
PowerPC
Chipset
Chipset
Chipset
Chipset
CPU
CPU
CPU
CPU
PEX 8648
PEX 8648
PEX 8648
PEX 8648
x8
x8
PEX 8648
PEX 8648
PEX 8648
PEX 8648
x8 or x4
CPU
CPU
CPU
CPU
Point
Point
Point
Point
End
End
End
End
x16
x4
x4
Memory
Memory
Memory
Memory
Memory
Memory
Memory
Memory
Point
Point
Point
Point
Point
Point
Point
Point
End
End
End
End
End
End
End
End
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).
Fail-Over Storage Systems with Dual Cast
The PEX 8648’s Dual Cast feature proves to be very
useful in storage systems. In Figure 6, the Dual Cast
feature enables the PEX 8648 to copy data going to its
four downstream ports to the backup system and vice
versa (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. Non-
Transparent (NT) ports are used to isolate the host
domains of the backup system from the primary system.
x8s
All
Figure 5. ATCA/MicroTCA Backplane Usage
10-20 AMC or 10 AMC
8 Disk Chassis
x4
FC
FC
PEX 8648
Carrier Modules
PEX 8648
Figure 6. Dual Cast in Storage Systems
Chipset
Chipset
Chipset
Chipset
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
CPU
CPU
CPU
CPU
x8
FC
FC
CPU
CPU
CPU
CPU
NT
NT
x4
8 Disk Chassis
x4
FC
FC
PEX 8616
PEX 8616
PEX 8616
Memory
Memory
Memory
Memory
PEX 8616
PEX 8616
PEX 8616
Fabric
x8
FC
FC
NT
NT
x4
Backplane
8 Disk Chassis
To
NT
x4
FC
FC
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
Chipset
Chipset
Chipset
Chipset
CPU
CPU
CPU
CPU
x8
FC
FC
PEX 8648
PEX 8648
PEX 8648
PEX 8648
PEX 8648
PEX 8648
PEX 8648
PEX 8648
CPU
CPU
CPU
CPU
NT
NT
x4
8648
8648
PEX
PEX
NT
8 Disk Chassis
x4
FC
FC
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
To other
Memory
Memory
Memory
Memory
Fabric
Backup
System
CPU
x8s
All
FC
FC
NT
NT
x4