PM3350-SW datasheet(148/224 Pages) PMC

148 / 224 page

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

146

Mpfsz(100Mb) versus Framesize given 80 byte

PacketBuffers

Framesize (bytes)

0.11

0.112

0.114

0.116

0.118

0.12

0.122

0.124

0.126

500

1000

1500

2000

Let Mdest be the number of chips in the system that will need to read the frame

across the PCI expansion bus utilizing the ELAN frame transfer protocol.

For unicast frames, Mdest is simply 1. For broadcast frames this is given by N-1

where N is the total number of switch chips connected to the PCI expansion

bus.

Whether the frame is unicast or broadcast/mulitcast over the PCI expansion bus

is a function of the destination address and whether the source and destination

addresses have been learned.

EXAMPLE #1:

Lets examine the worst-case PCI expansion bus data rate for a 2 port -100 Mb, 32-port

10 Mb switch constructed using two PM3351 and four PM3350 chips assuming:

•

all ports operating at maximum frame rate (Mfr =1)

•

all frames are switched over the PCI bus (Mlp = 1)

•

the 100 Mbit ports are full-duplex and the 10 Mbit ports are half-duplex

•

all of the 10 Mbit traffic will be switched over the PCI expansion bus (i.e. not

switched to local ports on the ELAN-8x10 devices).

PM3350-SW Datasheet(PDF) 148 Page - PMC-Sierra, Inc

PM3350-SW Datasheet(HTML) 148 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL