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參數(shù)資料
| 型號(hào)： | NM29A040V |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PROM |
| 英文描述： | 4 Mbit Uniform Sector, Serial Flash Memory |
| 中文描述： | 4M X 1 FLASH 5V PROM, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 218K |
| 代理商： | NM29A040V |
Instruction Set
The NM29A040/080 have 12 instructions which are de-
scribed in Table II. The command byte (Byte 1) has the
following format:
TL/D/12475–10
FIGURE 7. Command Byte
The MSB is always a ‘‘1’’ and is considered the start bit; all
leading ‘‘0’s’’ are ignored. The first ‘‘1’’ detected on the ris-
ing edge of SK indicates the initiation of a command. The
next 4 bits are the instruction opcode. The final 3 bits are
reserved and must always be ‘‘0’’. Data input of a command
other than those listed in Table II is prohibited. Data may be
corrupted if unspecified commands are used.
TABLE II. Instruction Set
Command
Byte 1
Byte 2
Byte 3
Get-Status
80H
Set-Address
88H
Block Address
Page Address
Increment
90H
Read
98H
Write
A0H
55H
Erase
A8H
Block Address
55H
Data-Shift-In
B0H
Y
Bits to Shift-In
Data-Shift-Out
B8H
Y
Bits to Shift-Out
Read Last Block
D0H
Write Enable
E0H
Write Disable
E8H
Write Last Block
F0H
55H
GET-STATUS
The Get-Status command allows the user to determine the
status of the NM29A040/080. It may be issued whether the
device is busy or not. The output is a status byte which
indicates the internal state of the Serial Flash. The output
byte is defined as:
TL/D/12475–11
FIGURE 8. Get-Status Byte
Bit 7 of the status byte tells whether the device is busy
performing an operation (write, erase, etc.) or is ready for a
new command. Bit 6 tells if a previous write or erase cycle
completed successfully. Bit 5 tells if the device is in a write
enabled or disabled mode. Bit 0 distinguishes between a
4-Mbit device and an 8-Mbit device. The remaining bits are
reserved for future use and may appear as any value (‘‘1’’ or
‘‘0’’).
TL/D/12475–12
FIGURE 9. Get-Status Sequence
SET-ADDRESS
The Set-Address command defines which page and block
of the memory is affected by an operation. The Set-Address
command is followed by two bytes, the first indicating the
block number and the second indicating the page number.
The block number chooses one of the 127/254 blocks while
the page number chooses one of the 128 pages within the
given block. The Set-Address command is usually followed
by a Read, Write, or Data-Shift-In command. Between the
page address byte and the next command there is a delay
of t
SADD
. The address that is selected remains the active
address until a new Set-Address or Increment command is
given.
INCREMENT
The Increment command automatically increments the se-
lected page address. When the Increment command is giv-
en after the last page in a block has been read, the address
will roll over to the first page in the following block. When
the last page in the last addressable block is read out fol-
lowed by an Increment command, the new address is inde-
terminate.
TL/D/12475–13
FIGURE 10. Increment Sequence
READ
The Read command transfers data from the selected page
of the memory array into the data register. To read the data
out through DO, the Read command is followed by the two
byte Data-Shift-Out command. There is a delay of t
R
be-
tween the Read command and the Data-Shift-Out command
as the data is transferred from the array to the on-chip buff-
er. During t
R
the status byte will indicate that the part is
busy.
WRITE
The Write command programs data from the 32-byte shift
register into a page in the memory array for the currently
selected address. A security code 55H follows the Write
command to ensure against accidental Writes. Get-Status
may be used to ensure that the operation was successful.
The Write command will be ignored if Write-Enable has not
been set.
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NM29A080 | 4 Mbit Uniform Sector, Serial Flash Memory |
| NM29A080EM | 4 Mbit Uniform Sector, Serial Flash Memory |
| NM29A080EV | 4 Mbit Uniform Sector, Serial Flash Memory |
| NM29A080M | 4 Mbit Uniform Sector, Serial Flash Memory |
| NM29A080V | 4 Mbit Uniform Sector, Serial Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NM29A080 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Mbit/8-Mbit CMOS Serial FLASH E2PROM |
| NM29A080EM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Mbit/8-Mbit CMOS Serial FLASH E2PROM |
| NM29A080EV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Mbit/8-Mbit CMOS Serial FLASH E2PROM |
| NM29A080M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Mbit/8-Mbit CMOS Serial FLASH E2PROM |
| NM29A080V | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Mbit/8-Mbit CMOS Serial FLASH E2PROM |
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