Global Standards for the Microelectronics Industry
Dictionary W
word-wide device
A device that has a parallel data interface of 16 bits or more (usually in multiples of 16 bits), possibly with additional bits appended to provide parity or error-detection capability.
References:JESD21-C#, 1/97
JESD100-B, 12/99
working area
The portion of a chamber, used for stress testing, that meets the calibration requirements. References: JEP153,1/08working peak reverse voltage (VRWM)
The peak reverse voltage excluding all transient voltages.
References:JESD77-B, 2/00
JESD282-B, 4/00
WP
See "write protect".
References:write
To make a permanent or transient recording of data in a storage device or on a data medium. (Ref. ANSI X3.172.)
References:JESD100-B, 12/99
write disturb
The corruption of data in one location caused by the writing of data at another location.
References:JESD100-B, 12/99
write enable (WE; W)
The input that, when true, causes the data present on the D or the DQ pin(s) to be written into the address cell(s) of the device. For devices that have one WE per byte, the WEs are designated LWE and UWE. For devices that have more than two bytes and one WE per byte, and for all modules that have multiple WEs, the WEs are numbered beginning with 0.
References:JESD21-C, 1/97
write protect (WP)
The output signal used to reflect the status of the write-protect switch on the memory card. If the memory card write-protect switch is present, this signal will be asserted by the card when the switch is enabled, and deasserted when the switch is disabled. If the memory card has no write-protect switch, the card will connect this line to ground or VCC, depending on the condition of the card memory. If the card can always be written, the pin will be connected to VSS. If the card is permanently write-protected, the pin will be connected to VCC.
References:JESD21-C, 1/97
write transfer (WT)
An operation in which the data to be written is introduced through the serial port and is then transferred internally to the memory array data bus for writing into the cells. At the same time, the "tap pointer" is set. This is a counter that defines the starting point in the serial register into which data is entered. Data is entered serially from this point, with wraparound when the end of the register is reached. The contents of the full serial register are transferred in parallel. In addition to the normal write transfer, numerous other types of special write transfers are defined in JESD 21-C.
References:JESD21-C, 1/97
WT
See "write transfer".
References:WVTR
See "water vapor transmission rate".
References: