w49v002a Winbond Electronics Corp America, w49v002a Datasheet - Page 28

• 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
Sector Erase Timing Diagram
#LFRAM
#RESET
LAD[3:0]
CLK
LAD[3:0]
LAD[3:0]
#RESET
#LFRAM
All the address loaded should be within the top 4MByte,FFFFFFFF to FFC00000, or within the bottom 1MByte, 000FFFFF to 000E0000.
#RESET
#LFRAM
LAD[3:0]
#RESET
#LFRAM
LAD[3:0]
#RESET
#LFRAM
#RESET
#LFRAM
LAD[3:0]
CLK
CLK
CLK
CLK
CLK
1 Clock
1 Clocks
1 Clock
1 Clock
1 Clock
1 Clock
3rd Start
5th Start
2nd Start
4th Start
6th Start
1st Start
0000b
0000b
0000b
0000b
0000b
0000b
1 Clocks
1 Clock
1 Clock
1 Clock
1 Clock
Memory
Write
Cycle
1 Clock
Memory
Write
Cycle
Memory
Write
Cycle
011Xb
Memory
Write
Cycle
011Xb
Memory
Write
Cycle
Memory
Write
Cycle
011Xb
011Xb
011Xb
011Xb
A[31:28] A[27:24] A[23:20] A[19:16]
A[31:28] A[27:24] A[23:20] A[19:16]
A[31:28] A[27:24] A[23:20] A[19:16]
A[31:28] A[27:24] A[23:20] A[19:16]
A[31:28] A[27:24] A[23:20] A[19:16]
A[31:28] A[27:24] A[23:20] A[19:16]
Write the 6th command(target sector to be erased) to the device in LPC mode.
Load Address "5555" in 8 Clocks
Load Address "2AAA" in 8 Clocks
Write the 3rd command to the device in LPC mode.
Write the 5th command to the device in LPC mode.
Load Address "2AAA" in 8 Clocks
Load Address "5555" in 8 Clocks
Write the 2nd command to the device in LPC mode.
Write the 4th command to the device in LPC mode.
Load Sector Address in 8 Clocks
Load Address "5555" in 8 Clocks
Write the 1st command to the device in LPC mode.
Address
Address
Address
Address
Address
Address
SA[15:12]
X010b
X101b
X010b
X101b
X101b
- 28 -
1010b
XXXXb
0101b
1010b
0101b
0101b
1010b
XXXXb
1010b
0101b
0101b
0101b
1010b
XXXXb
0101b
1010b
0101b
0101b
Preliminary W49V002A
0000b
Load Data "80"
Load Data "55"
in 2 Clocks
Load Data "55"
in 2 Clocks
Load Data "AA"
in 2 Clocks
0000b
0101b
in 2 Clocks
0101b
Load Data "AA"
1010b
Load Din
in 2 Clocks
in 2 Clocks
1010b
Data
Data
Data
Data
Data
Data
1000b
0101b
0011b
0101b
1010b
1010b
1111b Tri-State
1111b Tri-State
1111b Tri-State
1111b Tri-State
1111b Tri-State
1111b Tri-State
2 Clocks
2 Clocks
2 Clocks
2 Clocks
2 Clocks
2 Clocks
TAR
TAR
TAR
TAR
TAR
TAR
1 Clocks
1 Clock
1 Clock
1 Clock
1 Clock
0000b
0000b
1 Clock
0000b
Sync
0000b
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 Clocks
Start next
command
1 Clock
Start next
command
1 Clock
1 Clock
1 Clock