RPIXP2850BB Intel, RPIXP2850BB Datasheet - Page 103

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RPIXP2850BB

Manufacturer Part Number
RPIXP2850BB
Description
Manufacturer
Intel
Datasheet

Specifications of RPIXP2850BB

Operating Supply Voltage (typ)
1.3/1.5/2.5/3.3V
Operating Supply Voltage (max)
1.575/2.7/3.465V
Operating Supply Voltage (min)
1.235/2.3/3.135V
Mounting
Surface Mount
Operating Temperature (max)
70C
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Lead Free Status / Rohs Status
Not Compliant
5.1.3
Figure 59.
Hardware Design Guide
Flow Control Bus
The MSF Flow Control Bus passes CSIX-L1 flow control CFrames between two network
processors or between a Switch Fabric and a single network processor. The bus is implemented as
two independent unidirectional buses. It uses LVDS signaling with the same clocking rate as the
MSF receive and transmit channels and has a 4-bit data bus — yielding an available bandwidth
equal to 25 percent of the receive and transmit channels.
The Flow Control Bus can be configured in one of two modes:
When the IXP2800 or IXP2850 network processor is configured in Dual Chip, Full Duplex Mode,
the egress IXP28XX network processor automatically forwards CFrames received from the Switch
Fabric across the Flow Control Bus to the ingress IXP28SS network processor. Additionally, the
egress IXP2800 or IXP2850 network processor sends incoming and outgoing Link Level flow
control information across the Flow Control Serial Bus to the ingress IXP28XX network processor.
When the IXP2800 or IXP2850 network processor is configured in Simplex Mode, the Flow
Control Bus signals are connected directly to the Switch Fabric. The egress IXP2800 or IXP2850
network processor sends flow control CFrames directly to the Switch Fabric, and the Switch Fabric
sends flow control CFrames directly to the ingress IXP2800 or IXP2850 network processor.
Figure 59
CSIX Flow Control Interfaces: Simplex and Full Duplex Modes
Dual Chip, Full Duplex Mode for applications where the Fabric Interface uses the transmit and
receive channels to pass flow control CFrames.
Simplex Mode for applications where the Fabric Interface is designed to use the Flow Control
Bus to pass flow control CFrames.
Ingress
Intel
Network
Processor
Egress
Intel IXP2800
Network
Processor
CSIX Flow Control Interface: Simplex Mode
®
shows the IXP28XX network processor connected in both modes.
IXP2800
FCEFIFO
FCIFIFO
Flow Control TX
CSIX TX
CSIX RX
Control
Flow
RX
Interface
Switch
Fabric
Ingress
Intel IXP2800
Network
Processor
Egress
Intel IXP2800
Network
Processor
CSIX Flow Control Interface: Full Duplex Mode
Serial
Bus
IXP28XX Network Processor
FCIFIFO
MSF
Flow Control
Bus
MSF (SPI-4/CSIX/FC)
CSIX RX
CSIX TX
Interface
Switch
Fabric
A9391-02
103

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