P2020RDB-PB Freescale Semiconductor, P2020RDB-PB Datasheet - Page 4

• Manufacturer Part Number: P2020RDB-PB
• Description: BOARD REFERENCE DESIGN P2020
• Manufacturer: Freescale Semiconductor
• Series: QorlQ™r
• Type: MCUr

Specifications of P2020RDB-PB

• Contents: Board
• For Use With/related Products: P2020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Networking
Features for the Market:
• SD/MMC interface enables modularity by
• PCI Express interfaces enable multiple
• USB port for front-panel code uploads
• Triple Gigabit Ethernet (dual on SGMII for
Applications:
• Line card controller
• Mid-range line card control plane
• Low-end line card combined control and
• Shelf controller
Line Card Control Plane for
Enterprise Routers
One of the primary applications for the QorIQ
P2020 communications processor is as a line
card control plane processor. Typically the
P2020 will sit to the side of the main datapath,
which has I/O processors on the front panel
connected to a backplane interface device.
The P2020 processor will communicate with
these components using standard interfaces
such as PCI Express or the local bus. The
P2020 will often have front panel interfaces as
well. One Gigabit Ethernet interface may be
used for high-performance debug: the DUART
can be used for a low-level command line
interface and the USB port may be used for
front-panel code uploads when connecting
directly to a PC for maintenance. Redundant
Gigabit Ethernet ports to the backplane are
used as a management interface, which can
be used to communicate with a centralized
resource for receiving table updates, for
instance. The eSDHC interface enables
modularity by supporting booting from
flash memory cards.
5
supporting booting from flash cards
flexible I/O options
when connecting directly to a PC for
maintenance
redundancy for backplane interconnect)
and one Gigabit Ethernet interface for
high-performance debug and maintenance
data plane
The primary functions of a linecard
controller are:
• Exception handling: Packets that cannot be
• Board housekeeping: The control plane
• Table maintenance: A line card controller
Backplane
Line Card Control Plane for Enterprise Routers
interpreted by the typically more hardwired
datapath are kicked up to the control
plane processor. These may be older or
esoteric protocols which are not worth
accommodating in ASICs, but can be
handled with software with low performance
impact because they occur infrequently.
processor may be used to configure,
provision and control other devices on the
board. It also will collect statistics. It can
implement a command line interface.
may, especially in a distributed system,
manage the forwarding tables. The tables
are created by implementing a variety of
interior routing protocols (such as Open
Shortest Path First or Routing Information
Protocol) and external routing protocols
(such as Border Gateway Protocol). The
tables are then exported to the forwarding
path for per-packet access.
Gigabit Ethernet-
Management Interfaces
Exception handling
Route table maintenance
Line card control
Enhanced Local Bus
Ethernet
Switch
DRAM
QorIQ™
P2020
In the case of centralized processing, these
functions are performed by a centralized
processor, which can tolerate higher power
and associated increased cooling costs
because there are fewer of those cards per
system. In these cases, the line card has little
intelligence.
Implementing a line card in a distributed
processing system provides several
advantages. You may be able to forgo
the costly centralized services card,
which consumes a valuable slot in the
chassis. You have the opportunity to
perform local switching at the line card, thus
conserving system resources. And the system
becomes more scalable—as you add a line
card, you automatically get the increased
processing that it requires. However, in
this system, the costs of high-volume line
cards are critically important. Because of
that, thermal budgets are very tight. The
need for high performance at low power is a
requirement that the P2 family fulfills.
Flash
PCI Express
Devices
Devices
Devices
I/O
I/O
I/O
®
freescale.com/QorIQ
Gigabit Ethernet-
Debug I/F
DUART-CLI
USB-Code Upload