參數(shù)資料
型號(hào)： EN29LV400AT-55RTCP
廠商： Electronic Theatre Controls, Inc.
英文描述： Replaced by PTH04070W :
中文描述： 4兆位（為512k × 8位/ 256 × 16位）閃存引導(dǎo)扇區(qū)閃存，CMOS 3.0伏，只
文件頁(yè)數(shù)： 16/41頁(yè)
文件大?。?/td> 771K
代理商： EN29LV400AT-55RTCP
The “Toggle Bit” on DQ2, when used with DQ6, indicates whether a particular sector is actively
erasing (that is, the Embedded Erase algorithm is in progress), or whether that sector is erase-
suspended. Toggle Bit II is valid after the rising edge of the final WE# pulse in the command
sequence. DQ2 toggles when the system reads at addresses within those sectors that have been
selected for erasure. (The system may use either OE# or CE# to control the read cycles.) But DQ2
cannot distinguish whether the sector is actively erasing or is erase-suspended. DQ6, by
comparison, indicates whether the device is actively erasing, or is in Erase Suspend, but cannot
distinguish which sectors are selected for erasure. Thus, both status bits are required for sector and
mode information. Refer to the following table to compare outputs for DQ2 and DQ6.
Flowchart 6 shows the toggle bit algorithm, and the section “DQ2: Toggle Bit” explains the algorithm.
See also the “DQ6: Toggle Bit I” subsection. Refer to the Toggle Bit Timings figure for the toggle bit
timing diagram. The DQ2 vs. DQ6 figure shows the differences between DQ2 and DQ6 in graphical
form.
Reading Toggle Bits DQ6/DQ2
Refer to Flowchart 6 for the following discussion. Whenever the system initially begins reading
toggle bit status, it must read DQ7–DQ0 at least twice in a row to determine whether a toggle bit is
toggling. Typically, a system would note and store the value of the toggle bit after the first read. After
the second read, the system would compare the new value of the toggle bit with the first. If the
toggle bit is not toggling, the device has completed the program or erase operation. The system can
read array data on DQ7–DQ0 on the following read cycle.
However, if after the initial two read cycles, the system determines that the toggle bit is still toggling,
the system also should note whether the value of DQ5 is high (see the section on DQ5). If it is, the
system should then determine again whether the toggle bit is toggling, since the toggle bit may have
stopped toggling just as DQ5 went high. If the toggle bit is no longer toggling, the device has
successfully completed the program or erase operation. If it is still toggling, the device did not
complete the operation successfully, and the system must write the reset command to return to
reading array data.
The remaining scenario is that the system initially determines that the toggle bit is toggling and DQ5
has not gone high. The system may continue to monitor the toggle bit and DQ5 through successive
read cycles, determining the status as described in the previous paragraph. Alternatively, it may
choose to perform other system tasks. In this case, the system must start at the beginning of the
algorithm when it returns to determine the status of the operation (top of Flowchart 6).
Write Operation Status
This Data Sheet may be revised by subsequent versions 2005 Eon Silicon Solution, Inc., www.essi.com.tw
or modifications due to changes in technical specifications.
Rev. A, Issue Date: 2005/01/07
EN29LV400A
Operation
DQ7
DQ6
DQ5
DQ3
DQ2
RY/BY#
Embedded Program
Algorithm
Embedded Erase Algorithm
DQ7#
Toggle
0
N/A
No
toggle
Toggle
0
Standard
Mode
0
Toggle
0
1
0
Reading within Erase
Suspended Sector
Reading within Non-Erase
Suspended Sector
Erase-Suspend Program
1
No
Toggle
0
N/A
Toggle
1
Data
Data
Data
Data
Data
1
Erase
Suspend
Mode
DQ7#
Toggle
0
N/A
N/A
0
相關(guān)PDF資料
PDF描述
EN29LV400AT-55RTI Replaced by PTH04070W :
EN29LV400AT-70TC Replaced by PTH04070W :
EN29LV400AT-70TCP Replaced by PTH04070W :
EN29LV400AT-70TI Replaced by PTH04070W :
EN29LV400AT-70TIP Replaced by PTH04070W :
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EN29LV400AT-70TCP 制造商:EON SILICON SOLUTION INC 功能描述:4 Mb PAR NOR 512Kx8bit/256Kx16bit 3V 48-TSOP
EN29LV800AB-70TC 制造商:Eon Silicon Solution Inc 功能描述:
EN29LV800BB-70TCP 制造商:EON SILICON SOLUTION INC 功能描述:EN29LV800B Series, 8 Mbit 70 NS 48 TSOP 3 V Bottom Boot Sector NOR Flash
EN29LV800CT-70TIP 制造商:EON SILICON SOLUTION INC 功能描述:8mb TSOP 70ns nor flash
EN29SL400B-90BIP 制造商:EON SILICON SOLUTION INC 功能描述:EN29SL400 Series, 4 Mbit 90 NS 48 FBGA 1.8 V Bottom Boot Sector NOR Flash
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