Bus operations
M29W640GH, M29W640GL, M29W640GT, M29W640GB
(1)
Table 8.
Bus Operations, BYTE = V
IH
Address Inputs
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Operation
E
G
W
A0-A21
Bus Read
Bus Write
Output Disable
Standby
VIL VIL VIH
VIL VIH VIL
Cell Address
Data Output
Data Input
Hi-Z
Command Address
X
VIH VIH
X
X
VIH
X
X
Hi-Z
Read Manufacturer
Code
VIL VIL VIH
0020h
227Eh
Read Device Code
(cycle 1)
M29W640GH,
M29W640GL
220Ch
2210h
2201h
Read Device Code
(cycle 2)
M29W640GT,
M29W640GB
VIL VIL VIH
M29W640GH,
M29W640GT
Read Device Code
(cycle 3)
Table 9
M29W640GL,
M29W640GB
2200h
2288h (Factory locked)
M29W640GL,
M29W640GT,
M29W640GB
2208h (Customer
Lockable)
Read Extended
Memory Block
Verify Code
VIL VIL VIH
2298h(Factory Locked)
M29W640GH
2218h (Customer
Lockable)
0001h (protected)
Read Block
Protection Status
VIL VIL VIH
0000h (unprotected)
1. X = VIL or VIH
.
(1)
Table 9.
Read Electronic Signature addresses
A7-A0
A6-A0, DQ15A–1
Code
BYTE = V
BYTE = V
IH
IL
Manufacturer Code
00h
01h
00h
02h
Device Code (cycle 1)
Device Code (cycle 2)
0Eh
0Fh
1Ch
1Eh
Device Code (cycle 3)
Extended Memory Block Verify Code
Block Protection Status
03h
06h
02h(2)
04h(2)
1. A9 = VID; other address bits set to VIL or VIH
2. A12- A21 must be set to the block address.
.
22/90
NUMONYX [ NUMONYX B.V ]
