W49V002FAQ datasheet(22/32 Pages) WINBOND

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W49V002FA

- 22 -

TIMING WAVEFORMS FOR FWH INTERFACE MODE

Read Cycle Timing Diagram

TCYC

FWH4

#RESET

FWH[3:0]

Start

FWH

Read

IDSEL

CLK

TAR

Next Start

1 Clock

2 Clocks

1 Clock

A[15:12]

Address

Sync

TAR

1111b

Tri-State

0000b

TKQ

THD

TSU

A[11:8]

A[7:4]

0000b]

Data out 2 Clocks

D[7:4]

Data

D[3:0]

0000b

THD

TSU

Load Address in 7 Clocks

A[3:0]

M Size

XXXXb XA[22]XXb XXA[17:16]

1 Clock

0000b

1101b

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

Write Cycle Timing Diagram

TCYC

FWH4

#RESET

FWH[3:0]

Start

FWH

Write

IDSEL

CLK

TAR

Next Start

1 Clock

2 Clocks

1 Clock

A[15:12]

Load Data in 2 Clocks

D[7:4]

Address

Sync

TAR

Data

1111b

Tri-State

0000b

THD

TSU

A[11:8]

A[7:4]

0000b

D[3:0]

0000b

Load Address in 7 Clocks

A[3:0]

M Size

XXXXb

XXXXb XXA[17:16]b

1 Clock

0000b

1110b

W49V002FAQ Datasheet(PDF) 22 Page - Winbond

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