PM3350-SW datasheet(73/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

SrcChip:

8-bit index of source device that received packet. For the ELAN 8x10 system,

this must range from 0 through 7.

The NextDD field in the data descriptor contains a pointer to the next data descriptor in

a chain of descriptors that constitutes a queue of Ethernet frames or messages. If this

is the last (or only) element in the queue or chain, then this field is set to zero to

indicate a NULL pointer.

The Flags field holds a set of flag bits and bitfields that provide type and control

information for the data descriptor, and is formatted as follows:

4 3

Learn

Special

Type

TypeSpecific

Learn:

If set, indicates that the source address (SA) field of the Ethernet frame

pointed to by this descriptor contains a new MAC address that must be

learned by the device. Only valid for Ethernet frames received by the ELAN

8x10 from the PCI expansion port; should not be set if the data descriptor

points to a message.

Special:

If set, indicates that the data contained within the packet buffer chain pointed

to by this data descriptor requires special processing by the firmware, and

should not be treated as a normal Ethernet frame. This bit is typically set to

indicate a message that is being passed between devices on the PCI

expansion port.

Type:

This 2-bit field contains the type of frame pointed to by the data descriptor

FirstPB field, and is interpreted as follows:

Type

Interpretation

Unicast frame from remote device

Unicast frame from local MAC channel

Broadcast frame from remote device

Broadcast frame from local MAC channel

The above definitions of the Type field are only valid if the Special bit is clear,

indicating that this data descriptor points to a normal Ethernet frame.

TypeSpecific:

The 4-bit TypeSpecific field is used to hold information specific to the type of

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