Table 5. HY29F400 Command Sequences
Bus Cycles
1, 2, 3
T hird
Fourth
Add
Data
Add
Data
Fifth
Add
Data
Sixth
Add
Data
Electronic ID
7
Rev. 5.2/May 01
Command Sequence
Read/Reset 1
6, 8
F0
A0
80
80
AA
AA
PA
PD
55
55
RA
RD
Reset/Reset 2
7, 8
Program
Chip Erase
555
AAA
SA
10
30
Sector Erase
Word
Byte
Word
Byte
Word
Byte
Word
Byte
555
AAA
555
AAA
2AA
555
2AA
555
Second
Add
Data
RA
RD
2AA
55
555
2AA
55
555
2AA
55
555
2AA
55
555
555
AAA
555
AAA
555
AAA
555
AAA
Erase Suspend
4
Erase Resume
5
55
55
55
90
90
90
X00
Manufacturer Code
AD
X01 2223 (Top Boot), 22AB (Bottom Boot)
X02 23 (Top Boot), AB (Bottom Boot)
Device Code
Sector Protect Verify
(SA)X02
(SA)X04
Word
Byte
Word
Byte
Word
Byte
First
Write
Cycles Add
Data
1
XXX
F0
555
3
AA
AAA
555
4
AA
AAA
555
6
AA
AAA
555
6
AA
AAA
1
XXX
B0
1
XXX
30
555
3
AA
AAA
555
3
AA
AAA
555
3
AA
AAA
2AA
555
2AA
555
2AA
555
555
AAA
555
AAA
555
AAA
STATUS
Legend:
X = Don’t Care
PA = Address of the data to be programmed
RA = Memory address of data to be read
PD = Data to be programmed at address PA
RD = Data read from location RA during the read operation
SA = Sector address of sector to be erased or verified (see Note 3 and Table 1).
STATUS = Sector protect status: 0x00 = unprotected, 0x01 = protected.
Notes:
1. All values are in hexadecimal. DQ[15:8] are don’t care for unlock and command cycles.
2. All bus cycles are write operations unless otherwise noted.
3. Address is A[10:0] in Word mode and A[10:-1] in Byte mode. A[17:11] are don’t care except as follows:
•
For RA and PA, A[17:11] are the upper address bits of the byte to be read or programmed.
•
For the sixth cycle of Sector Erase, SA = A[17:12] are the sector address of the sector to be erased.
•
For the fourth cycle of Sector Protect Verify, SA = A[17:12] are the sector address of the sector to be verified.
4. The Erase Suspend command is valid only during a sector erase operation. The system may read and program in non-erasing sectors, or enter the
Electronic ID mode, while in the Erase Suspend mode.
5. The Erase Resume command is valid only during the Erase Suspend mode.
6. The second bus cycle is a read cycle.
7. The fourth bus cycle is a read cycle.
8. Either command sequence is valid. The command is required only to return to the Read mode when the device is in the Electronic ID command mode or if
DQ[5] goes High during a program or erase operation. It is not required for normal read operations.
HY29F400
11
HYNIX [ HYNIX SEMICONDUCTOR ]
