M29W160FT Datasheet, PDF (16/57 Pages) Numonyx B.V – 16 Mbit or 32 Mbit (x 8 or x 16, boot block) 3 V supply Flash memory

Bus operations
M29W160FT, M29W160FB, M29W320FT, M29W320FB
3.6
Special bus operations
Additional bus operations can be performed to read the Electronic Signature and also to
apply and remove Block Protection. These bus operations are intended for use by
programming equipment and are not usually used in applications. They require V_ID to be
applied to some pins.
3.7
Electronic signature
The memory has two codes, the manufacturer code and the device code, that can be read
to identify the memory. These codes can be read by applying the signals listed in Table 2.
and Table 3, Bus operations.
3.8
Block protection and Blocks unprotection
Each block can be separately protected against accidental Program or Erase. Protected
blocks can be unprotected to allow data to be changed.
There are two methods available for protecting and unprotecting the blocks, one for use on
programming equipment and the other for in-system use. Block Protect and Blocks
Unprotect operations are described in Appendix C.
Table 2. Bus operations, BYTE = V_IL(1)
Operation
E
G
W
Address inputs
DQ15A–1, A0-Amax
Data inputs/outputs
DQ14-DQ8
DQ7-DQ0
Bus Read
V_IL V_IL V_IH Cell address
Bus Write
V_IL V_IH V_IL Command address
Output Disable
X V_IH V_IH X
Standby
V_IH X X X
Read manufacturer
code
V_IL
V_IL
V_IH
A0=V_IL, A1=V_IL, A9=V_ID,
others V_IL or V_IH
Read device code
A0=V_IH, A1=V_IL,
V_IL V_IL V_IH A9=V_ID, others V_IL or
V_IH
Hi-Z
Data output
Hi-Z
Data input
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
20h
C4h (M29W160FT)
CAh (M29W320FT)
Hi-Z
49h (M29W160FB)
CBh (M29W320FB)
1. X = V_IL or V_IH.
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