M29W640GH, M29W640GL, M29W640GT, M29W640GB
Bus operations
(1)
Table 7.
Bus Operations, BYTE = V
IL
Data Inputs/Outputs
Address Inputs
Operation
E
G
W
DQ14-
DQ8
DQ15A–1, A0-A21
DQ7-DQ0
Bus Read
Bus Write
Output Disable
Standby
VIL VIL VIH
VIL VIH VIL
Cell Address
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Data Output
Data Input
Hi-Z
Command Address
X
VIH VIH
X
X
VIH
X
X
Hi-Z
Read Manufacturer
Code
VIL VIL VIH
Hi-Z
20h
7Eh
Read Device Code
(cycle 1)
M29W640GH,
M29W640GL
0Ch
10h
01h
Read Device Code
(cycle 2)
M29W640GT,
M29W640GB
VIL VIL VIH
Hi-Z
M29W640GH,
M29W640GT
Read Device Code
(cycle 3)
Table 9
M29W640GL,
M29W640GB
00h
88h (Factory locked)
M29W640GL,
M29W640GT,
M29W640GB
08h (Customer
Lockable)
Read Extended
Memory Block
Verify Code
VIL VIL VIH
Hi-Z
Hi-Z
98h(Factory Locked)
M29W640GH
18h (Customer
Lockable)
01h (protected)
00h (unprotected)
Read Block
Protection Status
VIL VIL VIH
1. X = VIL or VIH
.
21/90
NUMONYX [ NUMONYX B.V ]
