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8 Mbit (x16) Multi-Purpose Flash
A Microchip Technology Company
SST39WF800B
Data Sheet
Common Flash Memory Interface (CFI)
The SST39WF800A contains the CFI information that describes the characteristics of the device, and
supports both the original SST CFI Query mode implementation for compatibility with existing SST
devices, as well as the general CFI Query mode.
To enter the SST CFI Query mode, the system must write the three-byte sequence, same as the Prod-
uct ID Entry command, with 98H (CFI Query command) to address 5555H in the last byte sequence.
To enter the general CFI Query mode, the system must write a one-byte sequence using the Entry
command with 98H to address 55H.
Once the device enters the CFI Query mode, the system can read CFI data at the addresses given in
Tables 5 through 7. The system must write the CFI Exit command to return to Read mode from the CFI
Query mode.
Product Identification
The Product Identification mode identifies the device as the SST39WF800B and manufacturer as SST.
This mode is accessed by software operations. Use Software Product Identification operation to iden-
tify the part (i.e., using the device ID) when using multiple manufacturers in the same socket. For
details, see Table 4 for software operation, Figure 12 for the Software ID Entry and Read timing dia-
gram, and Figure 19 for the Software ID Entry command sequence flowchart.
Table 2: Product Identification Table
Address
Data
Manufacturer’s ID
Device ID
SST39WF800B
0000H
0001H
00BFH
273EH
T2.0 25031
Product Identification Mode Exit/CFI Mode Exit
To return to the standard Read mode, exit the Software Product Identification mode. Issue the Soft-
ware ID Exit command sequence which returns the device to the Read mode.
The Software ID Exit command may also be used to reset the device to the Read mode after any inad-
vertent transient condition that causes the device to behave abnormally, e.g., not read correctly.
The Software ID Exit/CFI Exit command is ignored during an internal Program or Erase operation. See
Table 4 for software command codes, Figure 14 for timing waveform, and Figure 19 for a flowchart.
?2011 Silicon Storage Technology, Inc.
9
DS25031A
08/11
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SST39WF800B-70-4C-MAQE 功能描述:闪存 8M (512Kx16) 70ns 1.65-1.95V Comm 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
SST39WF800B-70-4C-Y1QE 功能描述:闪存 8M (512Kx16) 70ns 1.65-1.95V Comm 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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