w49v002a Winbond Electronics Corp America, w49v002a Datasheet - Page 27

• Manufacturer Part Number: w49v002a
• Description: 256k X 8 Cmos Flash Memory With Lpc Interface
• Manufacturer: Winbond Electronics Corp America

Timing Waveforms for LPC Interface Mode, continued
Chip Erase Timing Diagram
LAD[3:0]
#RESET
#LFRAM
CLK
LAD[3:0]
All the address loaded should be within the top 4MByte,FFFFFFFF to FFC00000, or within the bottom 1MByte, 000FFFFF to 000E0000.
LAD[3:0]
#LFRAM
#RESET
#RESET
#LFRAM
LAD[3:0]
#RESET
#LFRAM
LAD[3:0]
LAD[3:0]
CLK
#RESET
#LFRAM
#RESET
#LFRAM
CLK
CLK
CLK
CLK
1 Clock
1 Clock
1 Clock
1 Clock
3rd Start
1 Clock
5th Start
1 Clock
2nd Start
4th Start
6th Start
1st Start
0000b
0000b
0000b
0000b
0000b
0000b
1 Clock
1 Clock
1 Clock
1 Clock
1 Clock
1 Clock
Memory
Write
Cycle
Memory
Write
Cycle
Memory
Write
Cycle
011Xb
Memory
Write
Cycle
011Xb
Memory
Write
Cycle
011Xb
011Xb
011Xb
Memory
Write
Cycle
011Xb
A[31:28]
A[31:28]
A[31:28]
A[31:28]
A[31:28]
A[31:28]
A[27:24]
A[27:24]
A[27:24]
A[27:24]
A[27:24]
A[27:24]
A[23:20]
A[23:20]
A[23:20]
A[23:20]
A[23:20]
A[23:20]
Load Address "5555" in 8 Clocks
Load Address "2AAA" in 8 Clocks
Load Address "2AAA" in 8 Clocks
Write the 3rd command to the device in LPC mode.
Load Address "5555" in 8 Clocks
Write the 5th command to the device in LPC mode.
Write the 2nd command to the device in LPC mode.
Write the 4th command to the device in LPC mode.
Load Address "5555" in 8 Clocks
Write the 6th command to the device in LPC mode.
Load Address "5555" in 8 Clocks
Write the 1st command to the device in LPC mode.
A[19:16]
A[19:16]
A[19:16]
A[19:16]
Address
A[19:16]
A[19:16]
Address
Address
Address
Address
Address
X101b
X101b
X010b
X010b
X101b
X101b
0101b
1010b
0101b
- 27 -
1010b
0101b
0101b
1010b
0101b
0101b
1010b
0101b
0101b
0101b
1010b
1010b
0101b
0101b
0101b
0000b
Load Data "80"
Load Data "55"
Preliminary W49V002A
Load Data "55"
in 2 Clocks
Load Data "AA"
in 2 Clocks
Load Data "10"
Load Data "AA"
in 2 Clocks
in 2 Clocks
in 2 Clocks
in 2 Clocks
0101b
0000b
0101b
1010b
1010b
Data
Data
Data
Data
Data
Data
1000b
0101b
0001b
0101b
1010b
1010b
1111b
1111b
Publication Release Date: April 2001
1111b
1111b
1111b
1111b
2 Clocks
2 Clocks
2 Clocks
2 Clocks
2 Clocks
2 Clocks
TAR
TAR
TAR
TAR
TAR
TAR
Tri-State
Tri-State
Tri-State
Tri-State
Tri-State
Tri-State
1 Clock
1 Clock
1 Clock
1 Clock
1 Clock
1 Clock
0000b
0000b
0000b
0000b
Sync
Sync
0000b
0000b
Sync
Sync
Sync
Sync
TAR
TAR
TAR
TAR
TAR
TAR
Internal
erase start
Internal
erase start
Start next
command
Start next
command
Start next
command
1 Clock
Start next
command
1 Clock
1 Clock
1 Clock
Start next
command
1 Clock
Revision A1