LSISASX12 LSI, LSISASX12 Datasheet - Page 32

• Manufacturer Part Number: LSISASX12
• Manufacturer: LSI

Specifications of LSISASX12

• Lead Free Status / Rohs Status: Not Compliant

2.2.1
2.2.2
2.2.3
2-10
Direct Routing
Subtractive Routing
Table Routing
Direct routing is done for SAS initiators, SAS targets, or SATA targets that
directly attach to one of the LSISASx12 phys. The LSISASx12 routes
frames based on the SAS address in the frame. The LSISASx12 does
not use routing tables or subtractive routing when performing direct
routing.
Subtractive routing occurs when the LSISASx12 routes frames with
unresolved addresses to a specific port. This port can be one of the
SPhynx modules or a group of SPhynx modules, as in the case of a wide
port. Subtractive routing is enabled through the register bus interface.
The
standard does not allow end devices to use subtractive routing.
The LSISASx12 supports 144 routing table entries in 12 banks with 12
entries each. Each phy can be configured to use any or all of the 12
banks, provided that the banks are contiguous. All entries include the
WWN and a disable bit. The WWN is valid when the disable bit is
cleared.
The table routing attribute is blocked when the Device Type is set to end
device. As such, the LSISASx12 uses direct routing. The SAS standard
does not allow end devices to use table routing.
Routing entries are stored in 12 register banks, which are accessible
through the register bus interface. Each bank supports up to 12 entries.
All entries include the WWN and a disable bit. Each phy can select any,
all, or none of these banks. The Bank Enable bits control the bank
selection. All banks selected by a phy are searched for an address hit to
that phy during the arbitration process. The remote entry disable bit must
be cleared to enable an address hit to a remote WWN in the remote
routing table.
Initiators obtain routing entry data and deliver it to the SMP target. The
SMP target then delivers this data to the routing table through the
primary internal registers.
Functional Description
Copyright © 2004, 2005 by LSI Logic Corporation. All rights reserved.
ECM Config
register configures subtractive routing. The SAS