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參數資料
| 型號： | W39V040BQ |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | PROM |
| 英文描述： | W39V040B |
| 中文描述： | 512K X 8 FLASH 3.3V PROM, 11 ns, PDSO32 |
| 封裝： | STSOP-32 |
| 文件頁數： | 6/32頁 |
| 文件大小： | 356K |
| 代理商： | W39V040BQ |
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W39V040B
Publication Release Date: April 14, 2005
- 6 -
Revision A3
Sector address (any address location within the desired Sector) is latched on the rising edge of R/#C in
programmer mode, while the command (30H) is latched on the rising edge of #WE.
Sector erase does not require the user to program the device prior to erase. When erasing a Sector,
the remaining unselected sectors are not affected. The system is not required to provide any controls or
timings during these operations.
The automatic Sector erase begins after the erase command is completed, right from the rising edge of
the #WE pulse for the last Sector erase command pulse and terminates when the data on DQ7, Data
Polling, is "1" at which time the device returns to the read mode. Data Polling must be performed at an
address within any of the sectors being erased.
Refer to the Erase Command flow Chart using typical command strings and bus operations.
6.6 Program Operation
The W39V040B is programmed on a byte-by-byte basis. Program operation can only change logical
data "1" to logical data "0." The erase operation, which changed entire data in main memory and/or
boot block from "0" to "1", is needed before programming.
The program operation is initiated by a 4-byte command cycle (see Command Codes for Byte
Programming). The device will internally enter the program operation immediately after the
byte-program command is entered. The internal program timer will automatically time-out (9
μ
S typ. -
T
BP
) once it is completed and then return to normal read mode. Data polling and/or Toggle Bits can be
used to detect end of program cycle.
6.7 Hardware Data Protection
The integrity of the data stored in the W39V040B is also hardware protected in the following ways:
(1) Noise/Glitch Protection: A #WE pulse of less than 5 nS in duration will not initiate a write cycle.
(2) V
DD
Power Up/Down Detection: The programming and read operation are inhibited when V
DD
is
less than 2.0V typical.
(3) Write Inhibit Mode: Forcing #OE low or #WE high will inhibit the write operation. This prevents
inadvertent writes during power-up or power-down periods.
6.8 WRITE OPERATION STATUS
The device provides several bits to determine the status of a program or erase operation: DQ5, DQ6,
and DQ7. Each of DQ7 and DQ6 provides a method for determining whether a program or erase
operation is complete or in progress. The device also offers a hardware-based output signal, RY/#BY in
programmer mode, to determine whether an Embedded Program or Erase operation is in progress or
has been completed.
DQ7: #Data Polling
The #Data Polling bit, DQ7, indicates whether an Embedded Program or Erase algorithm is in progress
or completed. Data Polling is valid after the rising edge of the final #WE pulse in the command
sequence.
During the Embedded Program algorithm, the device outputs on DQ7 and the complement of the data
programmed to DQ7. Once the Embedded Program algorithm has completed, the device outputs the
data programmed to DQ7. The system must provide the program address to read valid status
information on DQ7. If a program address falls within a protected sector, #Data Polling on DQ7 is active
for about 1
μ
S, and then the device returns to the read mode.
During the Embedded Erase algorithm, #Data Polling produces “0” on DQ7. Once the Embedded
相關PDF資料 |
PDF描述 |
|---|---|
| W39V040BQZ | W39V040B |
| W39V040B | W39V040B |
| W39V040BP | W39V040B |
| W39V040BPZ | W39V040B |
| W39V040C | 512K 】 8 CMOS FLASH MEMORY WITH LPC INTERFACE |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W39V040BQZ | 制造商:WINBOND 制造商全稱:Winbond 功能描述:W39V040B |
| W39V040C | 制造商:WINBOND 制造商全稱:Winbond 功能描述:512K 】 8 CMOS FLASH MEMORY WITH LPC INTERFACE |
| W39V040CP | 制造商:WINBOND 制造商全稱:Winbond 功能描述:512K 】 8 CMOS FLASH MEMORY WITH LPC INTERFACE |
| W39V040CPZ | 制造商:WINBOND 制造商全稱:Winbond 功能描述:512K 】 8 CMOS FLASH MEMORY WITH LPC INTERFACE |
| W39V040CQ | 制造商:WINBOND 制造商全稱:Winbond 功能描述:512K 】 8 CMOS FLASH MEMORY WITH LPC INTERFACE |
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