AM29LV640MB90REI Spansion Inc., AM29LV640MB90REI Datasheet - Page 40

• Manufacturer Part Number: AM29LV640MB90REI
• Manufacturer: Spansion Inc.

Specifications of AM29LV640MB90REI

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 90ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 3 to 3.6V
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 20mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Not Compliant

WRITE OPERATION STATUS
The device provides several bits to determine the status of a
program or erase operation: DQ2, DQ3, DQ5, DQ6, and
DQ7.
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.
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 the device is in Erase
Suspend. 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 µs, then the device returns to the
read mode.
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase
algorithm is complete, or if the device enters the Erase
Suspend mode, Data# Polling produces a “1” 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 µs, then the
device returns to the read mode. If not all selected
sectors 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 might not be valid.
Just prior to the completion of an Embedded Program
or Erase operation, DQ7 can change asynchronously
with DQ0–DQ6 while Output Enable (OE#) is asserted
low. That is, the device can change from providing sta-
tus information to valid data on DQ7. Depending on
when the system samples the DQ7 output, it can read
the status or valid data. Even if the device has com-
pleted the program or erase operation and DQ7 has
38
Table 14
and the following subsections describe the
D A T A
Am29LV640MT/B
S H E E T
valid data, the data outputs on DQ0–DQ6 might be still
invalid. Valid data on DQ0–DQ7 appears on succes-
sive read cycles.
Table 14
Figure 8
in
diagram.
Notes:
1. VA = Valid address for programming. During a sector
2. Recheck DQ7 even if DQ5 = “1” because DQ7 can
AC Characteristics
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.
change simultaneously with DQ5.
No
Figure 8. Data# Polling Algorithm
shows the outputs for Data# Polling on DQ7.
shows the Data# Polling algorithm.
Read DQ7–DQ0
Read DQ7–DQ0
DQ7 = Data?
DQ7 = Data?
Addr = VA
Addr = VA
DQ5 = 1?
START
FAIL
No
Yes
No
shows the Data# Polling timing
Yes
Yes
26190C8 February 1, 2007
PASS
Figure 20