M50FLW080A STMicroelectronics, M50FLW080A Datasheet - Page 11

• Manufacturer Part Number: M50FLW080A
• Description: 8 Mbit (13 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
• Manufacturer: STMicroelectronics

changed during Program or Erase Suspend, and
care should be taken to avoid this.
Write Protect (WP). The Write Protect input is
used to prevent the Main Blocks (Blocks 0 to 14)
from being changed. When Write Protect, WP, is
driven Low, V
the Main Blocks have no effect, regardless of the
state of the Lock Register. When Write Protect,
WP, is driven High, V
or Sector is determined by the Lock Registers. The
state of Write Protect, WP, does not affect the pro-
tection of the Top Block (Block 15). For details,
see
Write Protect, WP, must be set prior to a Program
or Erase operation is initiated, and must not be
changed until the operation has completed other-
wise unpredictable results may occur. Similarly,
unpredictable behavior is possible if WP is
changed during Program or Erase Suspend, and
care should be taken to avoid this.
Reserved for Future Use (RFU). Reserved
Future Use (RFU). These pins do not presently
have assigned functions. They must be left discon-
nected, except for ID0 and ID1 (when in LPC
mode) which can be left connected. The electrical
characteristics for these signals are as described
in the
Address/Address Multiplexed (A/A Mux)
Signal Descriptions
Please see
Address Inputs (A0-A10). The Address Inputs
are used to set the Row Address bits (A0-A10) and
the Column Address bits (A11-A19). They are
latched during any bus operation by the Row/Col-
umn Address Select input, RC.
Data Inputs/Outputs (DQ0-DQ7). The Data In-
puts/Outputs hold the data that is to be written to
or read from the memory. They output the data
stored at the selected address during a Bus Read
operation. During Bus Write operations they carry
the commands that are sent to the Command In-
terface of the internal state machine. The Data In-
puts/Outputs, DQ0-DQ7, are latched during a Bus
Write operation.
Output Enable (G). The Output Enable signal, G,
controls the output buffers during a Bus Read op-
eration.
APPENDIX
“Identification Inputs
Figure 3.
IL
, Program and Erase operations in
A..
IH
and
, the protection of the Block
Table
(ID0-ID3).” section.
2..
for
Write Enable (W). The Write Enable signal, W,
controls the Bus Write operation of the Command
Interface.
Row/Column Address Select (RC). The
Column Address Select input selects whether the
Address Inputs are to be latched into the Row Ad-
dress bits (A0-A10) or the Column Address bits
(A11-A19). The Row Address bits are latched on
the falling edge of RC whereas the Column Ad-
dress bits are latched on its rising edge.
Supply Signal Descriptions
The Supply Signals are the same for both interfac-
es.
V
supplies the power for all operations (read, pro-
gram, erase, etc.).
The Command Interface is disabled when the V
Supply Voltage is less than the Lockout Voltage,
V
accidentally damaging the data during power up,
power down and power surges. If the Program/
Erase Controller is programming or erasing during
this time, the operation aborts, and the memory
contents that were being altered will be invalid. Af-
ter V
reset to Read mode.
A 0.1µF capacitor should be connected between
the V
pin to decouple the current surges from the power
supply. Both V
connected to the power supply. The PCB track
widths must be sufficient to carry the currents re-
quired during program and erase operations.
V
Supply Voltage pin is used to select the Fast Pro-
gram (see the Quadruple Byte Program command
description in A/A Mux interface and the Double/
Quadruple Byte Program command description in
FWH mode) and Fast Erase options of the memo-
ry.
When V
take place as normal. When V
gram and Erase operations are used. Any other
voltage input to V
ior, and should not be used.
V
80 hours during the life of the memory.
V
age measurements.
CC
LKO
PP
PP
SS
Optional Supply Voltage. The V
Ground. V
Supply Voltage. The V
CC
. This is to prevent Bus Write operations from
should not be set to V
CC
becomes valid, the Command Interface is
PP
Supply Voltage pins and the V
= V
CC
M50FLW080A, M50FLW080B
CC
SS
PP
, program and erase operations
is the reference for all the volt-
Supply Voltage pins must be
will result in undefined behav-
PP
CC
PPH
= V
Supply Voltage
for more than
PPH
PP
SS
, Fast Pro-
Optional
Ground
Row/
11/53
CC