3 Bus operations
M29W640FT, M29W640FB
Table 4. Bus Operations, BYTE = VIH
Operation
E
G
W
Address Inputs
A0-A21
Bus Read
VIL VIL VIH Cell Address
Bus Write
VIL VIH VIL Command Address
Output Disable
X
VIH VIH X
Standby
VIH
X
XX
Read Manufacturer
Code
VIL
VIL
VIH
A0-A3 = VIL, A6 = VIL,
A9 = VID, Others VIL or VIH
Read Device Code
VIL
VIL
VIH
A0 = VIH, A1-A3= VIL, A6 = VIL,
A9 = VID, Others VIL or VIH
Read Extended
A0 -A1 = VIH, A2-A3= VIL,
Memory Block Verify VIL VIL VIH A6 = VIL, A9 = VID,
Code
Others VIL or VIH
Read Block
Protection Status
A0,A2,A3, A6= VIL,
VIL
VIL
VIH
A1 = VIH, A9 = VID,
A12-A21 = Block Address,
Others VIL or VIH
1. X = VIL or VIH.
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Data Output
Data Input
Hi-Z
Hi-Z
0020h
22EDh (M29W640FT)
22FDh (M29W640FB)
80h (factory locked)
00h (Customer Lockable)
0001h (protected)
0000h (unprotected)
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