w39l040a Winbond Electronics Corp America, w39l040a Datasheet - Page 9

• Manufacturer Part Number: w39l040a
• Description: 512k ? 8 Cmos Flash Memory
• Manufacturer: Winbond Electronics Corp America

6.4.2
The W39L040A also features the "Toggle Bit" as a method to indicate to the host system that the
embedded algorithms are in progress or completed.
During an Embedded Program or Erase Algorithm cycle, successive attempts to read (#OE toggling)
data from the device at any address will result in DQ6 toggling between one and zero. Once the
Embedded Program or Erase Algorithm cycle is completed, DQ6 will stop toggling and valid data will
be read on the next successive attempt. During programming, the Toggle Bit is valid after the rising
edge of the fourth #WE pulse in the four write pulse sequence. For chip erase, the Toggle Bit is valid
after the rising edge of the sixth #WE pulse in the six write pulse sequence. For sector erase, the
Toggle Bit is valid after the last rising edge of the sector erase #WE pulse. The Toggle Bit is active
during the sector erase time-out.
Either #CE or #OE toggling will cause DQ6 to toggle.
6.5 Table of Operating Modes
6.5.1
(V
6.5.2
(V
Read
Write
Standby
Write Inhibit
Output Disable
Auto select Manufacturers ID
Auto select Device ID
Manufacturer ID: Winbond
Device ID: W39L040A
ID
ID
= 12 ±0.5V)
= 12 ±0.5V)
DQ6: Toggle Bit
Device Bus Operations
Auto-select Codes (High Voltage Method)
DESCRIPTION
MODE
#CE
#CE #OE #WE
V
V
V
V
V
V
V
V
X
X
IL
IL
IH
IL
IL
IL
IL
IL
#OE
V
V
V
V
V
V
V
V
X
X
IL
IL
IH
IH
IL
IL
IL
IL
#WE
V
V
V
V
V
V
V
V
X
X
IH
IH
IH
IH
IH
IH
IH
IL
- 9 -
V
V
V
A0
V
A0
A0
A9
X
X
X
X
IH
ID
ID
IL
A1
V
V
A1
A1
X
X
X
X
A1 = V
IL
IL
THE OTHER ADDRESS
Publication Release Date: April 14, 2005
PIN
All Address = V
V
V
A9
A9
A9
X
X
X
X
ID
ID
IH
, All other = V
IL
DQ0 − DQ7
High Z/
High Z/
W39L040A
High Z
High Z
IL
Code
Code
Dout
Din
Dout
Dout
Revision A3
DQ[7:0]
DAhex
D6hex