HY29F080 Datasheet, PDF (15/38 Pages) Hynix Semiconductor – 8 Megabit (1M x 8), 5 Volt-only, Flash Memory

HY29F080
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:
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.
n A read cycle at address 0xXXX00 retrieves the
manufacturer code (Hynix = 0xAD).
n A read cycle at address 0xXXX01 returns the
device code (29F080 = 0xD5).
n A read cycle containing a sector group address
(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.
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.
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
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.
Table 6. Write and Erase Operation Status Summary
Mode
Operation
DQ[7] ¹ DQ[6] DQ[5] DQ[3] DQ[2] ¹ RY/BY#
Programming in progress
DQ[7]# Toggle
0/1 ²
N/A
N/A
0
Programming completed
Normal
Erase in progress
Data
Data ⁴
Data
Data
Data
1
0
Toggle
0/1 ²
1³
Toggle
0
Erase completed
1
Data ⁴
Data
Data
Data ⁴
1
Read within erase suspended
sector
1
No toggle
0
N/A
Toggle
1
Erase ^{Read within non-erase}
Suspend ^{suspended sector}
Data
Data
Data
Data
Data
1
Programming in progress ⁵
DQ[7]# Toggle
0/1 ²
N/A
N/A
0
Programming completed ⁵
Data
Data ⁴
Data
Data
Data
1
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.
applicable to the chip erase operation.
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).
DQ[3] is not
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_CC is required for proper operation. RY/
BY# is valid after the rising edge of the final WE#
pulse in the corresponding command sequence.
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.
Rev. 6.1/May 01
15