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PM9313 Datasheet(PDF) 81 Page - PMC-Sierra, Inc |
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PM9313 Datasheet(HTML) 81 Page - PMC-Sierra, Inc |
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81 / 343 page  PM9311/2/3/5 ETT1™ CHIP SET PMC-2000164 ISSUE 3 ENHANCED TT1™ SWITCH FABRIC Released Data Sheet PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 77 PMC-Sierra, Inc. 1.6.5.4 Alignment, Framing, and Transmission Functions Details of the alignment, framing, and transmission function of the LCS Protocol are covered in the “LCS Protocol Specification -- Protocol Version 2”, available from PMC-Sierra, Inc. 1.7 THE OUT-OF-BAND (OOB) BUS INTERFACE The Out-of-Band (OOB) bus provides a mechanism for a local CPU to control some or all ETT1 devices within a switch fabric. The OOB bus provides about 1Mbyte/sec of bandwidth which should be sufficient for the intended task. The OOB is a “local” bus in the sense that it only interconnects devices that are co-located on the same printed circuit board. A complete fabric will consist of many boards and therefore many separate OOB buses. The multiple OOB buses could be extended into a single logical bus via the use of a “satellite” bus controller on each board as shown in Figure 32. Alternatively, each OOB bus could be controlled by a local CPU and the CPUs could then communicate with the other CPUs via some other mechanism such as an Ethernet network. This document describes only the “local” OOB bus. All of the ETT1 devices have an OOB interface. The ETT1 devices are slave devices and so there must be a local master device, such as a satellite controller, that initiates bus transactions. Figure 32. One Implementation: The OOB Bus Consists of Both Local and Global Buses ETT1 ASIC ETT1 ASIC Satellite Controller PCB ETT1 ASIC ETT1 ASIC Satellite Controller PCB Central Controller PCB CPU local OOB bus local OOB bus global OOB bus (master) (master) |
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