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M50LPW012 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M50LPW012
Description  2 Mbit 256Kb x8, Boot Block 3V Supply Low Pin Count Flash Memory
Download  35 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M50LPW012 Datasheet(HTML) 6 Page - STMicroelectronics

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BUS OPERATIONS
The two interfaces have similar bus operations but
the signals and timings are completely different.
The Low Pin Count (LPC) Interface is the usual
interface and all of the functionality of the part is
available through this interface. Only a subset of
functions are available through the Address/
Address Multiplexed (A/A Mux) Interface.
Follow the section Low Pin Count (LPC) Bus
Operations below and the section Address/
Address Multiplexed (A/A Mux) Interface Bus
Operations below for a description of the bus
operations on each interface.
Low Pin Count (LPC) Bus Operations
The Low Pin Count (LPC) Interface consists of
four data signals (LAD0-LAD3), one control line
(LFRAME)
and
a
clock
(CLK).
In
addition
protection against accidental or malicious data
corruption can be achieved using two further
signals (TBL and WP). Finally two reset signals
(RP and INIT) are available to put the memory into
a known state.
The data signals, control signal and clock are
designed to be compatible with PCI electrical
specifications. The interface operates with clock
speeds up to 33MHz.
The following operations can be performed using
the appropriate bus cycles: Bus Read, Bus Write,
Standby, Reset and Block Protection.
Bus Read. Bus Read operations read from the
memory cells, specific registers in the Command
Interface or Low Pin Count Registers. A valid Bus
Read operation starts when Input Communication
Frame, LFRAME, is Low, VIL, as Clock rises and
the correct Start cycle is on LAD0-LAD3. On the
following clock cycles the Host will send the Cycle
Type + Dir, Address and other control bits on
LAD0-LAD3. The memory responds by outputting
Sync data until the wait-states have elapsed
followed by Data0-Data3 and Data4-Data7.
Refer to Table 7, LPC Bus Read Field Definitions,
and Figure 4, LPC Bus Read Waveforms, for a de-
scription of the Field definitions for each clock cy-
cle of the transfer. See Table 23, LPC Interface AC
Signal Timing Characteristics and Figure 9, LPC
Interface AC Signal Timing Waveforms, for details
on the timings of the signals.
Bus Write. Bus Write operations write to the
Command Interface or Low Pin Count Registers. A
valid Bus Write operation starts when Input
Communication Frame, LFRAME, is Low, VIL, as
Clock rises and the correct Start cycle is on LAD0-
LAD3. On the following Clock cycles the Host will
send the Cycle Type + Dir, Address, other control
bits, Data0-Data3 and Data4-Data7 on LAD0-
LAD3. The memory outputs Sync data until the
wait-states have elapsed.
Refer to Table 8, LPC Bus Write Field Definitions,
and Figure 5, LPC Bus Write Waveforms, for a
description of the Field definitions for each clock
cycle of the transfer. See Table 23, LPC Interface
AC Signal Timing Characteristics and Figure 9,
LPC Interface AC Signal Timing Waveforms, for
details on the timings of the signals.
Bus Abort. The Bus Abort operation can be used
to immediately abort the current bus operation. A
Bus Abort occurs when LFRAME is driven Low,
VIL, during the bus operation; the memory will tri-
state
the
Input/Output
Communication
pins,
LAD0-LAD3.
Table 5. Absolute Maximum Ratings (1)
Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-
tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-
ity documents.
2. Minimum Voltage may undershoot to -2V and for less than 20ns during transitions. Maximum Voltage may overshoot to VCC +2V
and for less than 20ns during transitions.
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
0 to 70
°C
TBIAS
Temperature Under Bias
–50 to 125
°C
TSTG
Storage Temperature
–65 to 150
°C
VIO
(2)
Input or Output Voltage
–0.6 to VCC + 0.6
V
VCC
Supply Voltage
–0.6 to 4
V
VPP
Program Voltage
–0.6 to 13
V


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