29F040-12AI Просмотр технического описания (PDF) - Winbond
Номер в каталоге
Компоненты Описание
Список матч
29F040-12AI Datasheet PDF : 29 Pages
| |||
BRIGHT
Microelectronics
Inc.
Preliminary BM29F040
Table 6. Command Definitions
Command
Sequence
Bus
Write
cycles
First Bus
Write
cycle
Second
Bus Write
cycle
required Address Data Address Data
Read /Reset
Read /Reset
Auto Select
1
XXXXH F0H
4
5555H AAH 2AAAH 55H
4
5555H AAH 2AAAH 55H
Third Bus Fourth Bus Fifth Bus
Write cycle Write cycle Write
cycle
Sixth Bus
Write
cycle
Address Data Address Data Address Data Addres Data
s
5555H F0H
5555H 90H
RA RD
00H ADH
01H 40H
Auto Select
Sector
Protect
Verify
Byte
Program
Chip Erase
Sector Erase
Sector Erase
Suspend
Sector Erase
Resume
4
5555H AAH 2AAAH 55H 5555H 90H
SA
00
X02 01
4
5555H AAH 2AAAH 55H 5555H A0H
PA PD
6
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H
6
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H SA 30H
1
XXXXH B0H
1
XXXXH 30H
Notes:
1. Address bit A15, A16, A17 and A18 = X = don′t care for all address commands except for Program
address (PA) and sector address (SA).
2. Bus operations are defined in Table 4.
3. RA = Address of the memory location to be read. PA = Address of the memory location to be programmed.
Addresses are latched on the falling edge of WE. SA = Address of the sector to be erased. The combination
of A16, A17 and A18 will uniquely select the sector.
4. RD = Data from the selected address location (RA) during read operation. PD = Data to be programmed at the
selected memory location (PA). Data is latched at the falling edge of /WE.
5. Auto select command can be used to evaluate whether a block is protected or not by using at the fourth address 02H.
This is similar to placing A9 to High Voltage.
Auto Select Command
The BM29F040 contains two different procedures for the autoselect mode. One is the traditional
PROM programmer methodology (by taking Address pin A9 to VID) and the other is by writing the
Auto Select command sequence into the command register. Following the third bus cycle write
command, a read cycle from Address 00H retrieves the BMI manufacturer code ADH, and a read
cycle at 01H retrieves the device code of 40H. Scanning the sector addresses (A16, A17, A18) while
(A6, A1, A0) = (0, 1, 0) will produce a logical at device output DQ0 for a protected sector. See table 5
for more details.
-8-
Share Link: 