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參數(shù)資料
| 型號： | W25X32-VSSI-Z |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | PROM |
| 英文描述： | 32M X 1 FLASH 2.7V PROM, PDSO8 |
| 封裝： | 0.208 INCH, ROHS COMPLIANT, SOIC-8 |
| 文件頁數(shù)： | 2/47頁 |
| 文件大?。?/td> | 1317K |
| 代理商： | W25X32-VSSI-Z |
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W25X16, W25X32, W25X64
- 10 -
10. FUNCTIONAL DESCRIPTION
10.1 SPI OPERATIONS
10.1.1 SPI Modes
The W25X16/32/64 is accessed through an SPI compatible bus consisting of four signals: Serial Clock
(CLK), Chip Select (/CS), Serial Data Input/Output (DIO) and Serial Data Output (DO). Both SPI bus
operation Modes 0 (0,0) and 3 (1,1) are supported. The primary difference between Mode 0 and Mode
3 concerns the normal state of the CLK signal when the SPI bus master is in standby and data is not
being transferred to the Serial Flash. For Mode 0 the CLK signal is normally low. For Mode 3 the CLK
signal is normally high. In either case data input on the DIO pin is sampled on the rising edge of the
CLK. Data on the DO and DIO pins are clocked out on the falling edge of CLK.
10.1.2 Dual Output SPI
The W25X16/32/64 supports Dual output operation when using the "Fast Read with Dual Output" (3B
hex) instruction. This feature allows data to be transferred from the Serial Flash memory at twice the
rate possible with the standard SPI. This instruction is ideal for quickly downloading code from Flash
to RAM upon power-up (code-shadowing) or for applications that cache code-segments to RAM for
execution. The Dual output feature simply allows the SPI input pin to also serve as an output during
this instruction. All other operations use the standard SPI interface with single output signal.
10.1.3 Hold Function
The /HOLD signal allows the W25X16/32/64 operation to be paused while it is actively selected (when
/CS is low). The /HOLD function may be useful in cases where the SPI data and clock signals are
shared with other devices. For example, consider if the page buffer was only partially written when a
priority interrupt requires use of the SPI bus. In this case the /HOLD function can save the state of the
instruction and the data in the buffer so programming can resume where it left off once the bus is
available again.
To initiate a /HOLD condition, the device must be selected with /CS low. A /HOLD condition will
activate on the falling edge of the /HOLD signal if the CLK signal is already low. If the CLK is not
already low the /HOLD condition will activate after the next falling edge of CLK. The /HOLD condition
will terminate on the rising edge of the /HOLD signal if the CLK signal is already low. If the CLK is not
already low the /HOLD condition will terminate after the next falling edge of CLK.
During a /HOLD condition, the Serial Data Output (DO) is high impedance, and Serial Data
Input/Output (DIO) and Serial Clock (CLK) are ignored. The Chip Select (/CS) signal should be kept
active (low) for the full duration of the /HOLD operation to avoid resetting the internal logic state of the
device.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W25X32VZEI | 制造商:WINBOND 制造商全稱:Winbond 功能描述:16M-BIT, 32M-BIT, AND 64M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI |
| W25X32VZEIG | 功能描述:IC FLASH 32MBIT 75MHZ 8WSON RoHS:是 類別:集成電路 (IC) >> 存儲器 系列:SpiFlash® 標(biāo)準(zhǔn)包裝:1,000 系列:- 格式 - 存儲器:RAM 存儲器類型:移動 SDRAM 存儲容量:256M（8Mx32） 速度:133MHz 接口:并聯(lián) 電源電壓:1.7 V ~ 1.95 V 工作溫度:-40°C ~ 85°C 封裝/外殼:90-VFBGA 供應(yīng)商設(shè)備封裝:90-VFBGA（8x13） 包裝:帶卷 (TR) 其它名稱:557-1327-2 |
| W25X32VZEIG T&R | 功能描述:IC FLASH 32MBIT 75MHZ 8WSON RoHS:是 類別:集成電路 (IC) >> 存儲器 系列:SpiFlash® 標(biāo)準(zhǔn)包裝:1,000 系列:- 格式 - 存儲器:RAM 存儲器類型:移動 SDRAM 存儲容量:256M（8Mx32） 速度:133MHz 接口:并聯(lián) 電源電壓:1.7 V ~ 1.95 V 工作溫度:-40°C ~ 85°C 封裝/外殼:90-VFBGA 供應(yīng)商設(shè)備封裝:90-VFBGA（8x13） 包裝:帶卷 (TR) 其它名稱:557-1327-2 |
| W25X32VZEIZ | 制造商:WINBOND 制造商全稱:Winbond 功能描述:16M-BIT, 32M-BIT, AND 64M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI |
| W25X32VZPI | 制造商:WINBOND 制造商全稱:Winbond 功能描述:16M-BIT, 32M-BIT, AND 64M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI |
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