Rainbow Electronics W27E520 - Manual (Page 9)

Advance Information W27E520
Publication Release Date: 4/26/2000
- 9 - Revision A1
Timing Waveforms, continued
Erase Waveform 1
OE/Vpp
13.0V
T PRT
V IH
V IL
ALE
V IH
V IL
Address Valid A[15:8]
V IH
V IL
A9 = 12.0V A9 = 13.0V
Others = V IL or V
A8 = V IL
IH
A8 = V IH
Others = V IL or V
A8, A11 = V IL
IH
A10 = V IH
AD[7:0] DA 1F D OUT
V
IH
V IL
Add
T EPW
T
VR
T OES
T OEH
T EOE
Read
Company
SID
Chip Erase Erase (Verify)
Read
Device
SID
V = 6.5V DD V = 5.0V
DD
V = 6.5V DD
Erase Waveform 2
OE/Vpp
13.0V
T PRT
V IH
V IL
ALE
V
IH
V IL
A[15:8]
V IH
V IL
A9=12.0
V
Others=V IL or V
A8=V IL
IH
A8=V IH
AD[7:0]
DA 1F
V
IH
V IL
Address Valid
D OUT Add
T EOE
Read
Company
SID
Command 1 Command 2
Read
Device
SID
OES
OEH VS
T RPT
T
T T
T OES
ALE
LAS
LAH
DS
EPW1
DH
55 AA
T
T
T
T T
AS T
T
AA 10
Erase Verify
Chip Erase
EPW2 T
A[15:8] = 55 A[15:8] = 2A
V =5.0V DD
V =6.5V
DD
V =6.5V
DD
V =6.5V
DD
Note: First command Address = 5555(hex) with Data = AA(hex)
Second command Address = 2AAA(hex) with Data = 10(hex)