Transmitters; Receivers; Context Managers; Initiator Operations - LSI LSIFC929 Technical Manual

Dual channel fibre channerl i/o processor

Table of Contents

1.3.7 Transmitters

The transmitter builds sequences based on context information and

transmits resulting frames to the FC link using the Link Controller. Each

transmitter includes two 2 Kbyte buffers to support frame payloads.

The receivers accept frame data from the Link Controller and DMAs the

encapsulated information to local or system memory. Each receiver

contains three 2 Kbyte buffers which support a BB-Credit of up to three

or an Alternate Login BB-Credit of 1 on each channel.

The LSIFC929 uses an ARM RISC processor in each channel to support

I/O context swap to external memory and FCP management for both

Initiator and Target applications. Context operations include support for

transmit and resource queue management as well as scatter/gather list

management.

The LSIFC929 autonomously handles FCP exchanges upon request

from the host. The LSIFC929 generates appropriate sequences and

frames necessary to complete the request and provides feedback to the

host on the status of the request.

The LSIFC929 provides for general purpose target functions such as

those required for front-end RAID applications.

The LSIFC929 provides the capabilities to do a simpliﬁed "Link Check"

Bit Error Rate (BER) test on the link for diagnostic purposes. In a special

test mode the controller can transmit and verify a programmed data

pattern for link evaluation.

Initiator Operations

1-9

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