您的位置：维库电子市场网 > Datasheet > AM29DL640H90WHEN

AM29DL640H90WHEN Datasheet

  • AM29DL640H90WHEN

  • 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Si...

  • 881.69KB

  • 54页

  • AMD

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

WRITE OPERATION STATUS
The device provides several bits to determine the status of a
program or erase operation: DQ2, DQ3, DQ5, DQ6, and
DQ7. Table 13 and the following subsections describe the
function of these bits. DQ7 and DQ6 each offer a method for
determining whether a program or erase operation is com-
plete or in progress. The device also provides a hard-
ware-based output signal, RY/BY#, to determine whether
an Embedded Program or Erase operation is in progress or
has been completed.
vice has completed the program or erase operation
a n d D Q 7 h a s va l i d d a t a , t h e d a t a o u t p u t s o n
DQ15鈥揇Q0 may be still invalid. Valid data on
DQ15鈥揇Q0 (or DQ7鈥揇Q0 for x8-only device) will ap-
pear on successive read cycles.
Table 13 shows the outputs for Data# Polling on DQ7.
Figure 6 shows the Data# Polling algorithm. Figure 22
in the AC Characteristics section shows the Data#
Polling timing diagram.
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host system
whether an Embedded Program or Erase algorithm is in
progress or completed, or whether a bank is in Erase Sus-
pend. Data# Polling is valid after the rising edge of the final
WE# pulse in the command sequence.
During the Embedded Program algorithm, the device out-
puts on DQ7 the complement of the datum programmed to
DQ7. This DQ7 status also applies to programming during
Erase Suspend. When the Embedded Program algorithm is
complete, the device outputs the datum 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 ac-
tive for approximately 1 碌s, then that bank returns to the
read mode.
During the Embedded Erase algorithm, Data# Polling
produces a 鈥?鈥?on DQ7. When the Embedded Erase
algorithm is complete, or if the bank enters the Erase
Suspend mode, Data# Polling produces a 鈥?鈥?on DQ7.
The system must provide an address within any of the
sectors selected for erasure to read valid status infor-
mation on DQ7.
After an erase command sequence is written, if all
sectors selected for erasing are protected, Data# Poll-
ing on DQ7 is active for approximately 100 碌s, then the
bank returns to the read mode. If not all selected sec-
tors are protected, the Embedded Erase algorithm
erases the unprotected sectors, and ignores the se-
lected sectors that are protected. However, if the sys-
tem reads DQ7 at an address within a protected
sector, the status may not be valid.
When the system detects DQ7 has changed from the
complement to true data, it can read valid data at
DQ15鈥揇Q0 (or DQ7鈥揇Q0 for x8-only device) on the
following
read cycles. Just prior to the completion of an
Embedded Program or Erase operation, DQ7 may
change asynchronously with DQ15鈥揇Q8 (DQ7鈥揇Q0
for x8-only device) while Output Enable (OE#) is as-
serted low. That is, the device may change from pro-
viding status infor mation to valid data on DQ7.
Depending on when the system samples the DQ7 out-
put, it may read the status or valid data. Even if the de-
START
Read DQ7鈥揇Q0
Addr = VA
DQ7 = Data?
Yes
No
No
DQ5 = 1?
Yes
Read DQ7鈥揇Q0
Addr = VA
DQ7 = Data?
Yes
No
FAIL
PASS
Notes:
1. VA = Valid address for programming. During a sector
erase operation, a valid address is any sector address
within the sector being erased. During chip erase, a
valid address is any non-protected sector address.
2. DQ7 should be rechecked even if DQ5 = 鈥?鈥?because
DQ7 may change simultaneously with DQ5.
Figure 6.
Data# Polling Algorithm
28
Am29DL640H
February 9, 2005

AM29DL640H90WHEN相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！