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8 Mbit Firmware Hub
A Microchip Technology Company
SST49LF008A
Data Sheet
Firmware Hub (FWH) Mode
Device Operation
The FWH mode uses a 5-signal communication interface, FWH[3:0] and FWH4, to control operations
of the SST49LF008A. Operations such as Memory Read and Memory Write uses Intel FWH propriety
protocol. JEDEC Standard SDP (Software Data Protection) Byte-Program, Sector-Erase and Block-
Erase command sequences are incorporated into the FWH memory cycles. Chip-Erase is only avail-
able in PP Mode.
The device enters standby mode when FWH4 is high and no internal operation is in progress. The
device is in ready mode when FWH4 is low and no activity is on the FWH bus.
Firmware Hub Interface Cycles
Addresses and data are transferred to and from the SST49LF008A by a series of “fields,” where each
field contains 4 bits of data. SST49LF008A supports only single-byte Read and Write, and all fields are
one clock cycle in length. Field sequences and contents are strictly defined for Read and Write opera-
tions. Addresses in this section refer to addresses as seen from the SST49LF008A’s “point of view,”
some calculation will be required to translate these to the actual locations in the memory map (and
vice versa) if multiple memory devices are used on the bus. Tables 3 and 4 list the field sequences for
Read and Write cycles.
?2011 Silicon Storage Technology, Inc.
9
DS25085A
10/11
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SST49LF008A-33-4C-NH 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:2 Mbit / 3 Mbit / 4 Mbit / 8 Mbit Firmware Hub
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SST49LF008A-33-4C-NHE_ 制造商:Microchip Technology Inc 功能描述:
SST49LF008A-33-4C-NHE-T 功能描述:闪存 8M (1Mx8) 33MHz 3.0-3.6V Commercial RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
SST49LF008A-33-4C-NHE-T-CUT TAPE 制造商:Microchip 功能描述:SST49LF Series 8 Mbit 1024 K x 8 3.3 V Firmware Hub - PLCC-32
SST49LF008A-33-4C-WH 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:2 Mbit / 3 Mbit / 4 Mbit / 8 Mbit Firmware Hub
SST49LF008A-33-4C-WHE 功能描述:闪存 8 MBIT FIRMWARE HUB RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
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