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參數(shù)資料
| 型號(hào)： | X84041P-3 |
| 英文描述： | Micro Port Saver E2PROM |
| 中文描述： | 微型端口節(jié)電器E2PROM的 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大小： | 67K |
| 代理商： | X84041P-3 |
X84041
3
Figure 1. Read Sequence
CE
OE
WE
I/O (IN)
"0"
RESET
LOAD ADDRESS
READ DATA
X
X
X
X
X
X
X
A8
A7 A6 A5 A4 A3 A2 A1 A0
I/O (OUT)
2704 ILL F03
D7
D6
D5
D4
D3
D2
D1
D0
Write Sequence
A nonvolatile write sequence consists of sending a reset
sequence, a 16-bit address (the first 7 of which are don’t
cares), up to 8 bytes of data, and then a special “start
nonvolatile write cycle” command sequence. The reset
sequence is issued first (as described in the Reset
Sequence section) to set the internal write enable latch.
The address is written serially by issuing 16 separate
write cycles (
WE
and
CE
LOW,
OE
HIGH) to the part
without any read cycles between the writes. The ad-
dress is sent serially, most significant bit first, on the l/O
pin. Up to eight bytes of data are written by issuing either
8, 16, 24, 32, 40, 48, 56, or 64 separate write cycles.
Again, no read cycles are allowed between writes. The
nonvolatile write cycle is initiated by issuing a special
read/write “1”/read sequence. The first read cycle ends
the page load, then the write “1” followed by a read starts
the nonvolatile write cycle. The X84041 recognizes 8-
byte pages beginning at addresses XXXXXX000. When
sending data to the part, attempts to exceed the upper
address of the page will result in the address counter
“wrapping-around” to the first address on the page,
where data loading can continue. For this reason, send-
ing more than 64 consecutive data bits will result in
overwriting previous data. A nonvolatile write cycle will
not start if a partial or incomplete write sequence is
issued. The internal write enable latch is reset when the
nonvolatile write cycle is completed to prevent inadvert-
ent writes. Note that this sequence is fully static, with no
special timing restrictions. The processor is free to
perform other tasks on the bus whenever the chip
enable pin (
CE
) is HIGH.
Nonvolatile Write Status
The status of a nonvolatile write cycle can be determined
at any time by simply reading the state of the l/O pin on
the X84041. This pin is read when
OE
and
CE
are LOW
and
WE
is HIGH. During a nonvolatile write cycle the l/
O pin is LOW. When the nonvolatile write cycle is
complete, the l/O pin goes HIGH. A reset sequence can
also be issued during a nonvolatile write cycle with the
same result: I/O is LOW as long as a nonvolatile write
cycle is in progress, and l/O is HIGH when the nonvola-
tile write cycle is done.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X84041PI | Micro Port Saver E2PROM |
| X84041PI-3 | Micro Port Saver E2PROM |
| X84041S | Micro Port Saver E2PROM |
| X84041S-2.7 | Micro Port Saver E2PROM |
| X84041S-3 | Micro Port Saver E2PROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X84041PI | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041PI-2.7 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041PI-3 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041S | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041S-2.7 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
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