PM3350-SW datasheet(44/224 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

System Memory Map

The ELAN 8x10 device uses a single linear (flat) byte-addressable 16 MB address

space for accessing memory and memory-mapped devices. The external memory map

for the system described above is quite straightforward. From the point of view of the

local memory bus, it is as follows (note that the memory addresses shown increase

upwards):

0xffffff

Unused

Bank 3

0xc00000

0xbfffff

Unused

Bank 2

0x800004

0x800000

LED Register

0x4fffff

Unused

0x420000

Bank 1

0x41ffff

Boot EPROM

(32 kB; occupies 128 kB)

0x400000

0x3fffff

Unused

0x100000

Bank 0

0x0fffff

System DRAM

(1 MB)

0x000000

Note that the 32 kB boot EPROM actually occupies 128 kB of address space. This is

because the EPROM is only 8 bits wide (i.e., a 32k x 8-bit configuration), and so is

connected to the least significant byte lane of the memory data bus. Hence each byte of

the EPROM takes up a full 32 bits worth of address space, leading to the 128 kB

requirement.

In a similar manner to the 8-bit wide EPROM, the LED register is mapped to the least

significant 8 bits of the data bus, but takes up a full 32 bits of address space. No other

device is shown as being mapped to the ELAN 8x10 address space in this simple and

minimal system; however, other devices (such as RS232-C serial ports) may be

interfaced as well, provided that firmware is developed to support them.

PM3350-SW Datasheet(PDF) 44 Page - PMC-Sierra, Inc

PM3350-SW Datasheet(HTML) 44 Page - PMC-Sierra, Inc

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