W49V002FA Datasheet, PDF (22/32 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY WITH FWH INTERFACE

TIMING WAVEFORMS FOR FWH INTERFACE MODE
Read Cycle Timing Diagram
W49V002FA
TCYC
CLK
#RESET
FWH4
FWH[3:0]
TSU T_HD
Start
FWH _IDSEL
Read
1101b 0000b
TSU THD
Address
XXXXb XA[22]XXb XXA[17:16] A[15:12] A[11:8] A[7:4] A[3:0]
1 Clock 1 Clock
Load Address in 7 Clocks
TKQ
M Size
TAR
Sync
Data
0000b] 1111b Tri-State 0000b D[3:0] D[7:4]
2 Clocks
1 Clock Data out 2 Clocks
TAR
Note: When A22 = high, the host will read the BIOS code from the FWH device.
While A22 = low, the host will read the GPI (Add = FFBC0100) or
Product ID (Add = FFBC0000/FFBC0001) from the FWH device
Next Start
0000b
1 Clock
Write Cycle Timing Diagram
CLK
#RESET
FWH4
FWH[3:0]
TCYC
Start
FWH
Write
IDSEL
1110b 0000b
Address
XXXXb XXXXb XXA[17:16]b A[15:12] A[11:8]
1 Clock 1 Clock
Load Address in 7 Clocks
A[7:4]
A[3:0]
TSU THD
M Size
Data
TAR
Sync
0000b D[3:0] D[7:4] 1111b Tri-State 0000b
Load Data in 2 Clocks 2 Clocks
1 Clock
TAR
Next Start
0000b
1 Clock
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