PMC-970277 (P4)
1998 PMC-Sierra, Inc. October, 1998
PM3350
Preliminary
PMC-Sierra,Inc.
8-Port 10 Mbit/s Switch
ELAN 8x10
FEATURES
Single-chip, 8-port, 10BaseT Ethernet
switch device for low-cost unmanaged
and managed networks.
On-chip SmartPath
TM
50 MHz RISC
CPU core, multi-channel DMA
controller, MAC-layer interface logic,
FIFOs, PCI-based expansion port, and
a flexible memory controller.
CPU supports background applications
running on local OS (e.g., SNMP), and
real-time data-oriented applications
(e.g., packet forwarding and filtering
decisions).
Concurrently switches packets
between eight independent, half-
duplex ports at the full Ethernet rate of
10 Mbit/s.
Fully compatible with the PM3351,
1-port 10/100 Mbit/s switch device;
may be used to create a compact and
inexpensive mixed 10/100 Mbit/s
switching hub.
Store-and-forward operation with full
error checking and filtering.
Low-latency operation in both unicast
and broadcast modes.
Filtering and switching at wire rates (up
to 148,8000 packets per second),
supporting a mix of Ethernet and
IEEE 802.3 protocols.
Performs all address learning, address
table management, and aging
functions for up to 32,768 MAC
addresses (limited by external
memory) with an address learning rate
of up to 10,000 addresses per second.
Maximum broadcast/multicast rate of
14,880 packets per second per port
with configurable broadcast storm rate
limiting.
Backpressure flow control with
configurable per-port buffer thresholds
and limits.
Expandable to 64 ports without loss in
throughput using multiple PM3350
devices via an on-chip 1 Gbit/s
expansion port.
Expansion port supports a peak
system bandwidth of 1 Gbit/s, and is
compatible with industry-standard PCI
bus (version 2.1).
Interfaces directly to industry-standard
10BaseT Ethernet Medium Access
Unit devices (LXT944 or similar) with
no glue logic.
Configuration, management, MIB
statistics, and diagnostics available
in-band (via on-chip SNMP agent with
integral TCP/UDP/IP stack).
Maintains and collects per-port and
per-host statistics at wire rates.
Fully static CMOS operation at 50 MHz
clock rates.
Implemented with a 3.3 V core and a
5 V-compatible I/O.
Available in a 256-pin Ball Grid Array
(BGA) package.
BLOCK DIAGRAM
50 MHz
Embedded
RISC CPU
I
Cache
D
Cache
Multi-Channel
DMA
Controller
External
Memory
Interface
EDO DRAM/EPROM
PCI Expansion
Bus
PCI Bus
Interface
Expansion
Registers
FIFO
10BaseT MAC
10BaseT
FIFO
10BaseT MAC
FIFO
10BaseT MAC
FIFO
10BaseT MAC
FIFO
10BaseT MAC
FIFO
10BaseT MAC
FIFO
10BaseT MAC
FIFO
10BaseT MAC
Qu
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10BaseT
10BaseT
10BaseT
10BaseT
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10BaseT
10BaseT
10BaseT
Head Office:
PMC-Sierra, Inc.
#105 - 8555 Baxter Place
Burnaby, B.C. V5A 4V7
Canada
Tel: 604.415.6000
Fax: 604.415.6200
Preliminary
PM3350 ELAN 8x10
8-Port 10 Mbit/s Switch
To order documentation,
send email to:
document@pmc-sierra.com
or contact the head office,
Attn: Document Coordinator
All product documentation is available
on our web site at:
http://www.pmc-sierra.com
For corporate information,
send email to:
info@pmc-sierra.com
PMC-970277 (P4)
1998 PMC-Sierra, Inc.
October, 1998
SmartPath is a trademark
of PMC-Sierra, Inc.
TYPICAL APPLICATIONS
LOW-COST 10 Mbit/s SWITCHES
The ELAN 8
10 chip can act as a stand-alone managed or unmanaged switching device in low-cost, compact switch applications.
Eight to sixty-four ports of 10BaseT switches can be built using the internal PCI expansion port. A typical system would use the
following:
PM3350 (one for every eight ports),
two 256k
16-bit 60 ns EDO or Fast Page Mode DRAM chips per ELAN 8
10 chip,
an EPROM or EEPROM (initialization, configuration, SNMP support firmware),
quad Ethernet interface adapters (LXT944), and
appropriate passive components.
A block diagram of a typical 8-port 10BaseT stackable switch is shown.
LOW-COST 10/100 Mbit/s SWITCHES
The ELAN 8
10 chip can be part of a fully managed 10/100 switch using the PM3351 ELAN 1
100 10/100 Mbit/s switch chip.
Together they can form a workgroup or desktop application. A block diagram of a typical 32-port 10BaseT stackable switch with
two 10/100 Mbit/s ports is shown. The PCI expansion bus is used to seamlessly connect the ELAN 8
10s and ELAN 1
100s.
PM3350
@G6I'
EDO DRAM
EEPROM
Quad 10BaseT
Interface
10BaseT
Ports 5-8
10BaseT
Ports 1-4
PCI Bus Expansion Bus
Quad 10BaseT
Interface
EDO
DRA
M
PCI Backplane
Quad
PHY
Quad
PHY
8
10BaseT
PM3351
@G6I [
SR
A
M
10/100 PHY
10/100BaseT
EDO
DRAM
Quad
PHY
Quad
PHY
8
10BaseT
EDO
DRA
M
SR
AM
10/100 PHY
10/100BaseT
PM3350
@G6I'
EDO
DRA
M
Quad
PHY
Quad
PHY
8
10BaseT
E
EPR
OM
PM3351
@G6I [
PM3350
@G6I'
PM3350
@G6I'
PM3350
@G6I'
Quad
PHY
Quad
PHY
8
10BaseT
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