am49pdl127ah Meet Spansion Inc., am49pdl127ah Datasheet - Page 46

• Manufacturer Part Number: am49pdl127ah
• Description: Stacked Multi-chip Package Mcp Flash Memory And Psram, 128 Megabit 8m ? 16-bit Cmos 3.0 Volt-only, Simultaneous Operation Flash Memory And 16 Mbit 1m ? 16-bit Cmos Pseudo Static Ram
• Manufacturer: Meet Spansion Inc.

COMMAND DEFINITIONS
Writing specific address and data commands or se-
quences into the command register initiates device op-
erations. Table 16 defines the valid register command
sequences. Writing incorrect address and data val-
ues or writing them in the improper sequence may
place the device in an unknown state. A reset com-
mand is then required to return the device to reading
array data.
All addresses are latched on the falling edge of WE#
or CE#f1/CE#f2 (PDL129H only), whichever happens
later. All data is latched on the rising edge of WE# or
CE#f1/CE#f2 (PDL129H only), whichever happens
first. Refer to the
timing diagrams.
Reading Array Data
The device is automatically set to reading array data
after device power-up. No commands are required to
retrieve data. Each bank is ready to read array data
after completing an Embedded Program or Embedded
Erase algorithm.
After the device accepts an Erase Suspend command,
the corresponding bank enters the erase-suspend-
read mode, after which the system can read data from
any non-erase-suspended sector within the same
bank. The system can read array data using the stan-
dard read timing, except that if it reads at an address
within erase-suspended sectors, the device outputs
status data. After completing a programming operation
in the Erase Suspend mode, the system may once
again read array data with the same exception. See
the Erase Suspend/Erase Resume Commands sec-
tion for more information.
The system must issue the reset command to return a
bank to the read (or erase-suspend-read) mode if DQ5
goes high during an active program or erase opera-
tion, or if the bank is in the autoselect mode. See the
next section, Reset Command, for more information.
See also
MCP Device Bus Operations
tion. The
Read-Only Operations – Am29PDL127H
vide the read parameters, and
timing diagram.
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 se-
quence cycles in an erase command sequence before
44
Read-Only Operations – Am29PDL127H
Requirements for Reading Array Data
Flash AC Characteristics
section for more informa-
A D V A N C E
Figure 13
Am49PDL127AH/Am49PDL129AH
tables pro-
shows the
section for
in the
and
I N F O R M A T I O N
erasing begins. This resets the bank to which the sys-
tem was writing to the read mode. Once erasure be-
gins, 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. 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 se-
quence 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 Sus-
pend 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.
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 pro-
gramming 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 au-
toselect command. The bank then enters the autose-
lect mode. The system may read any number of
autoselect codes without reinitiating the command se-
quence.
Table 16 shows the address and data requirements.
To determine sector protection information, the system
must write to the appropriate bank address (BA) and
sector address (SA).
and bank number associated with each sector.
The system must write the reset command to return to
the read mode (or erase-suspend-read mode if the
bank was previously in Erase Suspend).
Table 4
shows the address range
December 18, 2003