参数资料
型号: W28J800BT90C
元件分类: EEPROM
英文描述: EEPROM
中文描述: EEPROM的
文件页数: 16/51页
文件大小: 1468K
代理商: W28J800BT90C
W28J800B/T
Read Array Command
Upon initial device power-up and after exit from reset mode, the device defaults to read array mode.
This operation is also initiated by writing the Read Array command. The device remains enabled for
reads until another command is written. Once the internal WSM has started a block erase, full chip
erase, word/byte write or lock-bit configuration the device will not recognize the Read Array command
until the WSM completes its operation unless the WSM is suspended via an Erase Suspend or
Word/Byte Write Suspend command. The Read Array command functions independently of the V
PP
voltage and #RESET can be V
IH
.
Read Identifier Codes Command
The identifier code operation is initiated by writing the Read Identifier Codes command. Following the
command write, read cycles from addresses shown in Figure 4 retrieve the manufacturer, device,
block lock configuration and permanent lock configuration codes (see Table 4 for identifier code
values). To terminate the operation, write another valid command. Like the Read Array command, the
Read Identifier Codes command functions independently of the V
PP
voltage and #RESET can be V
IH
.
Following the Read Identifier Codes command, the following information can be read:
Table 4. Identifier Codes
CODE
ADDRESS(2)
[A18
A0]
DATA(3)
[DQ7
DQ0]
Manufacture Code
00000H
B0H
Top Boot
ECH
Device Code
Bottom Boot
00001H
EDH
DQ0 = 0
DQ0 = 1
Block Lock Configuration
Block is Unlocked
Block is Locked
Reserved for Future Use
BA(1)+2
DQ1
7
DQ0 = 0
DQ0 = 1
Permanent Lock Configuration
Device is Unlocked
Device is Locked ed
Reserved for Future Use
00003H
DQ1
7
Notes:
1. BA selects the specific block lock configuration code to be read. See Figure 4 for the device identifier code memory map.
2. A-1 don’t care in byte mode.
3. DQ15
DQ8 outputs 00H in word mode.
Read Status Register Command
The status register may be read to determine when a block erase, full chip erase, word/byte write or
lock-bit configuration is complete and whether the operation completed successfully. It may be read at
any time by writing the Read Status Register command. After writing this command, all subsequent
read operations output data from the status register until another valid command is written. The status
register contents are latched on the falling edge of #OE or #CE, whichever occurs last. #OE or #CE
must toggle to V
IH
before further reads to update the status register latch. The Read Status Register
command functions independently of the V
PP
voltage. #RESET can be V
IH
.
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