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Application Note
July 2008
©2008 Silicon Storage Technology, Inc.
S72075-00-000 07/08
11
The SST logo and SuperFlash are registered trademarks of Silicon Storage Technology, Inc.
These specifications are subject to change without notice.
INTRODUCTION
This Application Note is a comparative list of features for the SST49LF016C and the ST
®
M50FW080 and M50FW016 Firm-
ware Hub Devices (FWH). Each device is used as BIOS storage and functions as a boot device when the first fetch cycles of
the microprocessor are executed.
DESCRIPTION
The following tables detail the features, the software commands, and pin assignments for each device. All devices support a
two Bus Write cycle command structure for FWH write cycles. A guide to mapping a consistent format 8 Mbit FWH BIOS
image to a 16 Mbit FWH device is provided.
8 Mbit BIOS Image Mapping: M50FW080 to SST49LF016C
To map a modified BIOS image of the M50FW080 to the SST49LF016C, the BIOS ROM must occupy the top half memory
address of the SST49LF016C. The starting address of the SST49LF016C memory map is 100000H, and starting address
of the 4-GByte System Memory is FFF00000H.
TABLE 1: Features
Features SST49LF016C M50FW080 M50FW016
Block/Sector Definition 64K / 4K 64K / N/A 64K / N/A
Top Block and Block’s Partitions 16K Top block
8K/8K/32K
1
1. 16K T-BLOCK_LK Memory Map Register Address is FFBFC002H
8K T_MINUS01_LK Memory Map Register Address is FFBFA002H
8K T_MINUS03_LK Memory Map Register Address is FFBF8002H
32K T_MINUS03_LK Memory Map Register Address is FFBF0002H
Software Command Cycles
64K 64K
Programming Mode Supported AAI (Serial) A/A Mux A/A Mux
Manufacturer ID/Device ID BFH / 5CH 20H / 2DH 20H / 2EH
V
PP
Pin No Yes Yes
T1.2075
TABLE 2: Software Command Cycles
Command Sequence SST49LF008A M50FW080 M50FW016
Byte-Program 40H or 10H
(Single, double, and
quadruple byte-programs.)
40H or 10H 40H or 10H
(Single byte-program)
Quadruple Byte-Program No Op_code
(Supported in Byte-program)
30H
(A/A Mux only)
30H
(Mode/A/A Mux mode)
Sector-Erase (4K) 30H/D0H Not Supported See Quadruple By
Software ID Entry 90H 90H or 89H 90H or 89H
Software ID Exit FFH 90H or 98H
User-Security-ID-Program A5H Not Supported Not Support
User-Security-ID-Program-Lockout 85H/00H Not Supported Not Supported
T2.2075
SST49LF016C / M50FW080-M50FW016
Firmware Hub Device Comparison
Using Boh SST CFI and Spansion CFI in a System
