
28F800C3, 28F160C3, 28F320C3
E
50
PRELIMINARY
C.3
BLOCK LOCK STATUS REGISTER
The Block Status Register indicates whether an erase operation completed successfully or whether a given
block is locked or can be accessed for flash program/erase operations.
Block Erase Status (BSR.1) allows system software to determine the success of the last block erase
operation. BSR.1 can be used just after power-up to verify that the V
CC
supply was not accidentally removed
during an erase operation. This bit is only reset by issuing another erase operation to the block. The Block
Status Register is accessed from word address 02h within each block.
Table C4. Block Status Register
Offset
Length
Description
Add.
Value
(BA+2)h
(1)
1
Block Lock Status Register
BA+2:
--00 or --01
BSR.0 Block Lock Status
0 = Unlocked
1 = Locked
BA+2:
(bit 0): 0 or 1
BSR.1 Block Lock-Down Status
0 = Not locked down
1 = Locked down
BA+2:
(bit 1): 0 or 1
BSR 2
–7:
Reserved for future use
BA+2:
(bit 2–7): 0
NOTE:
1.
BA = The beginning location of a Block Address (i.e., 008000h is the beginning location of block 1 in word mode.)
C.4
CFI QUERY IDENTIFICATION STRING
The Identification String provides verification that the component supports the Common Flash Interface
specification. It also indicates the specification version and supported vendor-specified command set(s).
Table 5. CFI Identification
Offset
Length
Description
Add.
Hex
Code
--51
--52
--59
--03
--00
--35
--00
--00
Value
10h
3
Query-unique ASCII string “QRY“
10
11:
12:
13:
14:
15:
16:
17:
“Q”
“R”
“Y”
13h
2
Primary vendor command set and control interface ID code.
16-bit ID code for vendor-specified algorithms
Extended Query Table primary algorithm address
15h
2
17h
2
Alternate vendor command set and control interface ID
code.
0000h means no second vendor-specified algorithm exists
Secondary algorithm Extended Query Table address.
0000h means none exists
18:
19:
1A:
--00
--00
--00
19h
2