Emerson AMC-S402 manual Serial Storage I/O Interfaces, SAS Port Isolation Multiplexor Circuit

Functional Description

MMC

Figure 5. AMC-S402 Top Level Board Layout

80221 -12-04-2007MFB 6635 NTCZ010

Power

Regulator

Power

Regulator

MUX

3.3Serial Storage I/O Interfaces

The AMC-S402 modules plug into ATCA carrier blades and uTCA backplanes which support AMC.3 storage signaling. Port 2 is wired to the SAS primary port and Port 3 is wired the SAS secondary port.

Table 4 I/O Ports Available On AMC Connector

AMC I/O	Description
Port 2	3Gb SAS Receive and transmit pairs, Primary port
Port 3	3Gb SAS Receive and transmit pairs, Secondary port
MMC device	Serial IPMI management bus

3.3.1SAS Port Isolation Multiplexor Circuit

The AMC-S402 includes SAS re-transmitter circuits that can be used to adjust or “wave-shape” the transmit signal characteristics driven out the AMC finger connections (storage signaling ports 2 and 3). At manufacturing time, this circuit is pre-set to values that are optimal for the majority of deployments.

Programmable parameters include:

∙transmit pre-emphasis (five levels)

∙receiver equalization (three levels)

∙Transmit output swing to support SAS up to 1600mV

Tools are available to adjust these circuits to accommodate atypical backplane or cable situations. Please contact your Emerson applications engineer if you feel your deployment will require different settings.

6806800H60A AMC-S402 Installation and Use 10