參數(shù)資料
型號(hào)： AM29LV200B-100EE
廠商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： PROM
英文描述： 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
中文描述： 256K X 8 FLASH 3V PROM, 100 ns, PDSO48
封裝： TSOP-48
文件頁(yè)數(shù)： 12/37頁(yè)
文件大?。?/td> 478K
代理商： AM29LV200B-100EE
Am29LV200
12
P R E L IM IN A R Y
Autoselect Command Sequence
The autoselect command sequence allows the host
system to access the manufacturer and devices codes,
and determine whether or not a sector is protected.
Table 5 shows the address and data requirements.
This method is an alternative to that shown in Table 4,
which is intended for PROM programmers and requires
V
ID
on address bit A9.
The autoselect command sequence is initiated by writ-
ing two unlock cycles, followed by the autoselect com-
mand. The device then enters the autoselect mode,
and the system may read at any address any number
of times, without initiating another command sequence.
A read cycle at address XX00h retrieves the manufac-
turer code. A read cycle at address XX01h in word
mode (or 02h in byte mode) returns the device code. A
read cycle containing a sector address (SA) and the
address 02h in word mode (or 04h in byte mode) re-
turns 01h if that sector is protected, or 00h if it is unpro-
tected. Refer to Tables 2 and 3 for valid sector
addresses.
The system must write the reset command to exit the
autoselect mode and return to reading array data.
Word/Byte Program Command Sequence
The system may program the device by word or byte,
depending on the state of the BYTE# pin. Program-
ming is a four-bus-cycle operation. The program com-
mand sequence is initiated by writing two unlock write
cycles, followed by the program set-up command. The
program address and data are written next, which in
turn initiate the Embedded Program algorithm. The
system is notrequired to provide further controls or tim-
ings. The device automatically provides internally gen-
erated program pulses and verifies the programmed
cell margin. Table 5 shows the address and data re-
quirements for the byte program command sequence.
When the Embedded Program algorithm is complete,
the device then returns to reading array data and ad-
dresses are no longer latched. The system can deter-
mine the status of the program operation by using
DQ7, DQ6, or RY/BY#. See “Write Operation Status”
for information on these status bits.
Any commands written to the device during the Em-
bedded Program Algorithm are ignored. Note that a
hardware reset
immediately terminates the program-
ming operation. The program command sequence
should be reinitiated once the device has reset to read-
ing array data, to ensure data integrity.
Programming is allowed in any sequence and across
sector boundaries.
A bit cannot be programmed
from a “0” back to a “1”.
Attempting to do so may halt
the operation and set DQ5 to “1”, or cause the Data#
Polling algorithm to indicate the operation was suc-
cessful. However, a succeeding read will show that the
data is still “0”. Only erase operations can convert a “0”
to a “1”.
Figure 2 illustrates the algorithm for the program oper-
ation. See the Erase/Program Operations table in “AC
Characteristics” for parameters, and to Figure 16 for
timing diagrams.
Chip Erase Command Sequence
Chip erase is a six bus cycle operation. The chip erase
command sequence is initiated by writing two unlock
cycles, followed by a set-up command. Two additional
unlock write cycles are then followed by the chip erase
command, which in turn invokes the Embedded Erase
algorithm. The device does
not
require the system to
preprogram prior to erase. The Embedded Erase algo-
rithm automatically preprograms and verifies the entire
memory for an all zero data pattern prior to electrical
erase. The system is not required to provide any con-
trols or timings during these operations. Table 5 shows
the address and data requirements for the chip erase
command sequence.
START
Write Program
Command Sequence
Data Poll
from System
Verify Data
No
Yes
Last Address
No
Yes
Programming
Completed
Increment Address
Embedded
Program
algorithm
in progress
20513D-5
Note:
See Table 5 for program command sequence.
Figure 2.
Program Operation
相關(guān)PDF資料
PDF描述
AM29LV200T-100EC Circular Connector; No. of Contacts:3; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:8; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:8-33 RoHS Compliant: No
Am29LV200T-100ECB Circular Connector; MIL SPEC:MIL-C-26482, Series I; Body Material:Aluminum Alloy; Series:MS3120; No. of Contacts:6; Connector Shell Size:10; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
AM29LV200T-100EE Circular Connector; MIL SPEC:MIL-C-26482, Series I; Body Material:Aluminum Alloy; Series:MS3120; No. of Contacts:10; Connector Shell Size:12; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
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