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參數(shù)資料
| 型號(hào)： | S29GL064M90TFIR20 |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | 3.0 Volt-only Page Mode Flash Memory featuring 0.23 um MirrorBit process technology |
| 中文描述： | 4M X 16 FLASH 3V PROM, 90 ns, PDSO56 |
| 封裝： | LEAD FREE, MO-142EC, TSOP-56 |
| 文件頁(yè)數(shù)： | 29/160頁(yè) |
| 文件大小： | 2142K |
| 代理商： | S29GL064M90TFIR20 |
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April 30, 2004 S29GLxxxM_00A5
S29GLxxxM MirrorBit
TM
Flash Family
29
P r e l i m i n a r y
Word/Byte Configuration
The BYTE# pin controls whether the device data I/O pins operate in the byte or
word configuration. If the BYTE# pin is set at logic ‘1’, the device is in word con-
figuration, DQ0–DQ15 are active and controlled by CE# and OE#.
If the BYTE# pin is set at logic ‘0’, the device is in byte configuration, and only
data I/O pins DQ0–DQ7 are active and controlled by CE# and OE#. The data I/
O pins DQ8–DQ14 are tri-stated, and the DQ15 pin is used as an input for the
LSB (A-1) address function.
Requirements for Reading Array Data
To read array data from the outputs, the system must drive the CE# and OE#
pins to V
IL
. CE# is the power control and selects the device. OE# is the output
control and gates array data to the output pins. WE# should remain at V
IH
.
The internal state machine is set for reading array data upon device power-up,
or after a hardware reset. This ensures that no spurious alteration of the memory
content occurs during the power transition. No command is necessary in this
mode to obtain array data. Standard microprocessor read cycles that assert valid
addresses on the device address inputs produce valid data on the device data
outputs. The device remains enabled for read access until the command register
contents are altered.
See “Reading Array Data” for more information. Refer to the AC Read-Only Op-
erations table for timing specifications and the timing diagram. Refer to the DC
Characteristics table for the active current specification on reading array data.
Page Mode Read
The device is capable of fast page mode read and is compatible with the page
mode Mask ROM read operation. This mode provides faster read access speed for
random locations within a page. The page size of the device is 4 words/8 bytes.
The appropriate page is selected by the higher address bits A(max)–A2. Address
bits A1–A0 in word mode (A1–A-1 in byte mode) determine the specific word
within a page. This is an asynchronous operation; the microprocessor supplies
the specific word location.
The random or initial page access is equal to t
ACC
or t
CE
and subsequent page
read accesses (as long as the locations specified by the microprocessor falls
within that page) is equivalent to t
PACC
. When CE# is deasserted and reasserted
for a subsequent access, the access time is t
ACC
or t
CE
. Fast page mode accesses
are obtained by keeping the “read-page addresses” constant and changing the
“intra-read page” addresses.
Writing Commands/Command Sequences
To write a command or command sequence (which includes programming data
to the device and erasing sectors of memory), the system must drive WE# and
CE# to V
IL
, and OE# to V
IH
.
The device features an
Unlock Bypass
mode to facilitate faster programming.
Once the device enters the Unlock Bypass mode, only two write cycles are re-
quired to program a word, instead of four. The “Word Program Command
Sequence” section has details on programming data to the device using both
standard and Unlock Bypass command sequences.
An erase operation can erase one sector, multiple sectors, or the entire device.
Table
2
-Table
13
indicates the address space that each sector occupies.
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