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AM29LV116D 데이터시트(PDF) 23 Page - Advanced Micro Devices

부품명 AM29LV116D
상세설명  16 Megabit (2 M x 8-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
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September 12,2006 21359E5
Am29LV116D
21
DATA SHEE T
WRITE OPERATION STATUS
The device provides several bits to determine the sta-
tus of a write operation: DQ2, DQ3, DQ5, DQ6, DQ7,
and RY/BY#. Table 10 and the following subsections
describe the functions of these bits. DQ7, RY/BY#, and
DQ6 each offer a method for determining whether a
program or erase operation is complete or in progress.
These three bits are discussed first.
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host sys-
tem whether an Embedded Algorithm is in progress or
completed, or whether the device is in Erase Suspend.
Data# Polling is valid after the rising edge of the final
WE# pulse in the program or erase command se-
quence.
During the Embedded Program algorithm, the device
outputs on DQ7 the complement of the datum pro-
grammed to DQ7. This DQ7 status also applies to pro-
g r ammin g dur i ng Er a s e Su spe nd. 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 active for
approximately 1 µs, then the device returns to reading
array data.
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase al-
gorithm is complete, or if the device enters the Erase
Suspend mode, Data# Polling produces a “1” on DQ7.
This is analogous to the complement/true datum output
described for the Embedded Program algorithm: the
erase function changes all the bits in a sector to “1”;
prior to this, the device outputs the “complement,” or
“0.” The system must provide an address within any of
the sectors selected for erasure to read valid status in-
formation on DQ7.
After an erase command sequence is written, if all sec-
tors selected for erasing are protected, Data# Polling
on DQ7 is active for approximately 100 µs, then the de-
vice returns to reading array data. If not all selected
sectors are protected, the Embedded Erase algorithm
erases the unprotected sectors, and ignores the se-
lected sectors that are protected.
When the system detects DQ7 has changed from the
complement to true data, it can read valid data at DQ7–
DQ0 on the following read cycles. This is because DQ7
may change asynchronously with DQ0–DQ6 while
Output Enable (OE#) is asserted low. Figure 17, Data#
Polling Timings (During Embedded Algorithms), in the
“AC Characteristics” section illustrates this.
Table 10 shows the outputs for Data# Polling on DQ7.
Figure 5 shows the Data# Polling algorithm.
DQ7 = Data?
Yes
No
No
DQ5 = 1?
No
Yes
Yes
FAIL
PASS
Read DQ7–DQ0
Addr = VA
Read DQ7–DQ0
Addr = VA
DQ7 = Data?
START
Notes:
1. VA = Valid address for programming. During a sector
erase operation, a valid address is an address within any
sector selected for erasure. During chip erase, a valid
address is any non-protected sector address.
2. DQ7 should be rechecked even if DQ5 = “1” because
DQ7 may change simultaneously with DQ5.
Figure 5.
Data# Polling Algorithm


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