C5NPD0-DS datasheet(23/100 Pages) FREESCALE

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Fabric Processor

V 04

• Management of a host interface through the PCI

• Management of system interfaces (PCI, Serial Bus, PROM)

System Interfaces

The system interfaces to the XP are:

• PCI — Provides an industry standard 32bit 33/66MHz PCI channel used for chip-level

shared resources. The PCI has both initiator and target capabilities. The PCI interface is

typically connected to a host processor.

• Serial Bus Interface — Provides a general purpose bi-directional, two-wire serial bus

and I/O port that allows the C-5 NP to control external logic with either of two

standard protocols:

– The MDIO (high-speed) protocol: uses a 16bit data format with 10bits of

addressing and supports transfers up to 25MHz.

– The low-speed protocol: uses an 8bit data format followed by an acknowledge bit

and supports transfers up to 400kbps.

Software is used to select which protocol to use, by setting the appropriate bits in the

Serial Bus Configuration Register. When a serial bus transfer is active, an external pin is

driven by the C-5 NP to indicate which protocol is being used (SPLD=0 indicates MDIO

protocol; SPLD=1 indicates low-speed protocol).

Both SIDA and SICL are bi-directional lines that are connected, via an external pull-up

resistor, to a positive supply voltage. When the bus is free, both lines are HIGH because

of the pull-up resistor. The output stages of the devices connected to the bus must

have either an open-drain or open-collector in order to perform the wired-AND

function required for its arbitration mechanism.

• PROM Interface — Allows the XP to boot from nonvolatile, flash memory. The PROM

interface is a low-speed, serial I/O port that runs at 1/

2 to

16 the core clock rate. The

maximum PROM size is 8MBytes, and a 16bit wide configuration is required. External

board logic is required to perform serial-to-parallel conversion for PROM address

outputs and parallel-to-serial conversion for PROM data inputs.

Fabric Processor

The Fabric Processor (FP) acts as a high-speed network interface port with advanced

functionality. It allows the C-5 NP to interface to an application-specific switching solution

internal to your design. The FP port supports the bidirectional transfer of packets, frames,

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