pex-8624 PLX, pex-8624 Datasheet - Page 3

• Manufacturer Part Number: pex-8624
• Description: 24-lane, 6-port Pci Express Gen 2 5.0 Gt/s Switch, 19 X 19mm Fcbga
• Manufacturer: PLX

Advanced Mezzanine Cards
The PEX 8624’s fan-out capabilities can be utilized on
Advanced Mezzanine Cards (AMC) for I/O expansion.
In the example shown below in Figure 4, the PEX 8624
is used on a Quad-Port Network Interface Card (NIC) in
an AMC form factor. The PEX 8624 uses a x8 upstream
link to the host and four x4 downstream links to to fan-
out to the four MAC/PHY controllers.
Embedded Systems
The PEX 8624 is well suited for embedded applications
as well. Embedded applications, like the example shown
in Figure 5, commonly use a number of independent
modules for functions such as control plane processing,
data acquisition, or image processing to name a few
possibilities. Figure 5 represents a bladed embedded
system utilizing a PEX 8624 to fan-out to the I/O
Modules. The PEX 8624’s NT port isolates the
processors on the two switch fabrics.
10GE
10GE
10GE
10GE
Endpoint
Endpoint
Endpoint
Endpoint
Figure 4. Quad-Port 10GE NIC AMC
Endpoint
Endpoint
Endpoint
Endpoint
Figure 3. Fan-in/out Usage
x16
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
MAC/PHY
x16
PCIe Gen1 or PCIe Gen2 slots
Chipset
Chipset
Chipset
Chipset
CPU
CPU
CPU
CPU
x4
x4
x4
x4
x4
x4
PEX 8624
PEX 8624
PEX 8624
PEX 8624
CPU
CPU
CPU
CPU
x8
PEX 8624
PEX 8624
PEX 8624
PEX 8624
x4
x4
Memory
Memory
Memory
Memory
x8
Failover Storage Systems with Dual Cast
The PEX 8624’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 8624 to
copy data going to its two 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.
x4
PEX 8624
PEX 8624
PEX 8624
PEX 8624
Chipset
Chipset
Chipset
Chipset
CPU
CPU
CPU
CPU
Figure 6. Dual Cast in Storage Systems
x8
Control
Control
Control
Control
Figure 5. Bladed Embedded System
8 Disk Chassis
x4
FC
FC
FC
FC
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
PEX 8616
CPU
CPU
CPU
CPU
Control
Control
Control
Control
FC
FC
FC
FC
NT
NT
x4
x4
Memory
Memory
Memory
Memory
I/O Blades
Backplane
PEX 8624
PEX 8624
PEX 8624
PEX 8624
x8
Control
Control
Control
Control
8 Disk Chassis
PEX 8616
PEX 8616
PEX 8616
PEX 8616
x4
FC
FC
FC
FC
x4
NT
NT
Switch
Fabric
Control
Control
Control
Control
Chipset
Chipset
Chipset
Chipset
CPU
CPU
CPU
CPU
NT
FC
FC
FC
FC
x8
x4
CPU
CPU
CPU
CPU
8624
PEX
8624
PEX
x4
Memory
Memory
Memory
Memory
Backup
System