HY29F080 Hynix Semiconductor, HY29F080 Datasheet - Page 15

• Manufacturer Part Number: HY29F080
• Description: 8 Megabit (1M X 8), 5 Volt-only, Flash Memory
• Manufacturer: Hynix Semiconductor

The Electronic ID command sequence is initiated
by writing two unlock cycles, followed by the Elec-
tronic ID command. The device then enters the
Electronic ID mode, and:
n A read cycle at address 0xXXX00 retrieves the
n A read cycle at address 0xXXX01 returns the
n A read cycle containing a sector group address
The host system may read at any address any
number of times, without initiating another com-
WRITE OPERATION STATUS
The HY29F080 provides a number of facilities to
determine the status of a program or erase op-
eration. These are the RY/BY# (Ready/Busy#)
pin and certain bits of a status word which can be
Table 6. Write and Erase Operation Status Summary
Notes:
1. A valid address is required when reading status information. See text for additional information.
2. DQ[5] status switches to a ‘1’ when a program or erase operation exceeds the maximum timing limit.
3. A ‘1’ during sector erase indicates that the 50 µs timeout has expired and active erasure is in progress. DQ[3] is not
4. Equivalent to ‘No Toggle’ because data is obtained in this state.
5. Programming can be done only in a non-suspended sector (a sector not marked for erasure).
RY/BY# - Ready/Busy#
RY/BY# is an open-drain output pin that indicates
whether a programming or erase Automatic Algo-
rithm is in progress or has completed. A pull-up
resistor to V
BY# is valid after the rising edge of the final WE#
pulse in the corresponding command sequence.
Rev. 6.1/May 01
S
N
applicable to the chip erase operation.
M
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manufacturer code (Hynix = 0xAD).
device code (29F080 = 0xD5).
(SGA) in A[19:17] and the address 0x02 in
A[7:0] returns 0x01 if that sector is protected,
or 0x00 if it is unprotected.
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mand sequence. Thus, for example, the host may
determine the protection status for all sector
groups by doing successive reads at address 0x02
while changing the SGA in A[19:17] for each cycle.
The system must write the Reset command to exit
the Electronic ID mode and return to the Read
mode, or to the Erase Suspend mode if the de-
vice was in that mode when the command se-
quence was issued.
read from the device during the programming and
erase operations. Table 6 summarizes the status
indications and further detail is provided in the
subsections which follow.
If the output is Low (busy), the device is actively
erasing or programming, including programming
while in the Erase Suspend mode. If the output is
High (ready), the device has completed the op-
eration and is ready to read array data in the nor-
mal or Erase Suspend modes, or it is in the standby
mode.
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HY29F080
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#
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