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AM29BDS128H Fiches technique(PDF) 38 Page - Advanced Micro Devices

No de pièce AM29BDS128H
Description  128 or 64 Megabit (8 M or 4 M x 16-Bit) CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory
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Fabricant  AMD [Advanced Micro Devices]
Site Internet  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29BDS128H Fiches technique(HTML) 38 Page - Advanced Micro Devices

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36
Am29BDS128H/Am29BDS640H
27024B3 May 10, 2006
D A TA
SH EE T
Table 18.
Configuration Register
Note:Device will be in the default state upon power-up or hardware reset.
Reset Command
Writing the reset command resets the banks to the
read or erase-suspend-read mode. Address bits are
don’t cares for this command.
The reset command may be written between the
sequence cycles in an erase command sequence
before erasing begins. This resets the bank to which
the system was writing to the read mode. Once erasure
begins, however, the device ignores reset commands
until the operation is complete.
The reset command may be written between the
sequence cycles in a program command sequence
before programming begins (prior to the third cycle).
This resets the bank to which the system was writing to
the read mode. If the program command sequence is
written to a bank that is in the Erase Suspend mode,
writing the reset command returns that bank to the
erase-suspend-read mode. Once programming
begins, however, the device ignores reset commands
until the operation is complete.
The reset command may be written between the
sequence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command must
be written to return to the read mode. If a bank entered
the autoselect mode while in the Erase Suspend mode,
writing the reset command returns that bank to the
erase-suspend-read mode.
If DQ5 goes high during a program or erase operation,
writing the reset command returns the banks to the
read mode (or erase-suspend-read mode if that bank
was in Erase Suspend).
Autoselect Command Sequence
The autoselect command sequence allows the host
system to access the manufacturer and device codes,
and determine whether or not a sector is protected.
Table 20, “Memory Array Command Definitions,” on
page 46 shows the address and data requirements.
The autoselect command sequence may be written to
an address within a bank that is either in the read or
erase-suspend-read mode. The autoselect command
may not be written while the device is actively program-
ming or erasing in the other bank.
The autoselect command sequence is initiated by first
writing two unlock cycles. This is followed by a third
write cycle that contains the bank address and the
autoselect command. The bank then enters the
autoselect mode. No subsequent data will be made
available if the autoselect data is read in synchronous
mode. The system may read at any address within the
same bank any number of times without initiating
another autoselect command sequence. Read com-
mands to other banks will return data from the array.
The following table describes the address require-
ments for the various autoselect functions, and the
resulting data. BA represents the bank address, and
Address BIt
Function
Settings (Binary)
A19
Set Device
Read Mode
0 = Synchronous Read (Burst Mode) Enabled
1 = Asynchronous Mode (default)
A18
RDY
0 = RDY active one clock cycle before data
1 = RDY active with data (default)
A17
Clock
0 = Burst starts and data is output on the falling edge of CLK
1 = Burst starts and data is output on the rising edge of CLK (default)
A16
A15
Read Mode
Synchronous Mode
00 = Continuous (default)
01 = 8-word linear with wrap around
10 = 16-word linear with wrap around
11 = 32-word linear with wrap around
A14
A13
A12
Programmable
Wait State
000 = Data is valid on the 2th active CLK edge after AVD# transition to VIH
001 = Data is valid on the 3th active CLK edge after AVD# transition to VIH
010 = Data is valid on the 4th active CLK edge after AVD# transition to VIH
011 = Data is valid on the 5th active CLK edge after AVD# transition to VIH
100 = Data is valid on the 6th active CLK edge after AVD# transition to VIH
101 = Data is valid on the 7th active CLK edge after AVD# transition to VIH (default)
110 = Reserved
111 = Reserved


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