PM3351-SW datasheet(64/268 Pages) PMC

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PM3351 ELAN 1X100

DATA SHEET

PMC-970113

ISSUE 3

SINGLE PORT FAST ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

MDATA[8:6]

MTYPE2[2:0]

Indicates the memory type associated with MCS[2]*. The

encoding is the same as for MTYPE3[2:0].

MDATA[5:3]

MTYPE1[2:0]

Indicates the memory type associated with MCS[1]*. The

encoding is the same as for MTYPE3[2:0].

MDATA[2:0]

MTYPE0[2:0]

Indicates the memory type associated with MCS[0]*. The

encoding is the same as for MTYPE3[2:0].

After the hardware configuration information has been latched from the data bus, it is

loaded into the DCONFIG and MCONFIG registers. The lower 16 bits of the

configuration word (i.e., bits 0 through 15, latched from MDATA[15:0]) are loaded into

the MCONFIG register, with MDATA[0] being loaded into the LSB of MCONFIG. The

upper 16 bits (i.e., corresponding to MDATA[31:16]) are loaded into the DCONFIG

System Bootstrap Image

The ELAN 1x100 is designed to self-initialize upon power-up, using information and

operating firmware supplied as a pre-determined image (referred to as the

boot image)

in external memory (typically, EPROM or EEPROM). The boot image may be located

anywhere in the 16 MB address space, and it must start on a 64 kB boundary. The

ELAN 1x100 expects the boot image to be formatted in a predefined manner, as

described below. The boot image consists of a boot header and a set of boot data

blocks.

Boot Header

The boot image is distinguished by a special 32-bit signature followed by a predefined

configuration header. The ELAN 1x100 will, therefore, perform some basic initialization

indicated by the hardware configuration word loaded from the data bus after reset, and

then begin scanning the entire memory space at 64 kB boundaries for the boot image

signature. It expects to find the four bytes of the signature aligned on four consecutive

32-bit boundaries, as indicated in the following table:

Offset from 64kB

Boundary

Expected Contents

(hex)

XXXXXXC7

XXXXXXA8

XXXXXX37

+12

XXXXXX59

The use of a signature to locate the boot image, rather than an explicit address, implies

that it is not necessary to indicate the exact location of the configuration image to the

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