SST49LF040 Silicon Storage Technology, SST49LF040 Datasheet - Page 8

• Manufacturer Part Number: SST49LF040
• Description: 4 Mbit LPC Flash
• Manufacturer: Silicon Storage Technology

TABLE 1: P
©2001 Silicon Storage Technology, Inc.
Symbol
A
DQ
OE#
WE#
MODE
INIT#
ID[3:0]
or
ID[3:1]
GPI[4:0]
TBL#
LAD[3:0]
LCLK
LFRAME# Frame
RST#
WP#
R/C#
RES
V
V
CE#
NC
10
DD
SS
1. I=Input, O=Output
-A
7
-DQ
0
0
Row/Column
Pin Name
Address
Data
Output Enable
Write Enable
Interface
Mode Select
Initialize
Identification
Inputs
General
Purpose Inputs
Top Block Lock
Address and
Data
Clock
Reset
Write Protect
Select
Reserved
Power Supply
Ground
Chip Enable
No Connection
IN
D
ESCRIPTION
Type
PWR
PWR
I/O
I/O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1
Interface
PP LPC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Functions
Inputs for low-order addresses during Read and Write operations. Addresses are
internally latched during a Write cycle. For the programming interface, these
addresses are latched by R/C# and share the same pins as the high-order
address inputs.
To output data during Read cycles and receive input data during Write cycles.
Data is internally latched during a Write cycle. The outputs are in tri-state when
OE# is high.
To gate the data output buffers.
To control the Write operations.
This pin determines which interface is operational. When held high, programmer
mode is enabled and when held low, LPC mode is enabled. This pin must be
setup at power-up or before return from reset and not change during device oper-
ation. This pin must be held high (V
This is the second reset pin for in-system use. This pin is internally combined
with the RST# pin; If this pin or RST# pin is driven low, identical operation is
exhibited.
These four pins are part of the mechanism that allows multiple parts to be attached
to the same bus. These pins are internally pulled-down with a resistor between 20-
100 KΩ
These individual inputs can be used for additional board flexibility. The state of
these pins can be read through LPC registers. These inputs should be at their
desired state before the start of the PCI clock cycle during which the read is
attempted, and should remain in place until the end of the Read cycle. Unused
GPI pins must not be floated.
When low, prevents programming to the boot block sectors at top of memory.
When TBL# is high it disables hardware write protection for the top block sectors.
This pin cannot be left unconnected.
To provide LPC control signals, as well as addresses and Command
Inputs/Outputs data.
To provide a clock input to the control unit
To indicate start of a data transfer operation; also used to abort an LPC cycle
in progress.
To reset the operation of the device
When low, prevents programming to all but the highest addressable blocks.
When WP# is high it disables hardware write protection for these blocks.
This pin cannot be left unconnected.
Select for the Programming interface, this pin determines whether the address
pins are pointing to the row addresses, or to the column addresses.
These pins must be left unconnected.
To provide power supply (3.0-3.6V)
Circuit ground (0V reference)
This signal must be asserted to select the device. When CE# is low, the device
is enabled. CE# must remain low during internal Write (Program or Erase)
operations. When CE# is high, the device is placed in low power Standby mode.
Unconnected pins.
8
IH
) for PP mode and low (V
4 Mbit LPC Flash
Advance Information
SST49LF040
S71213-00-000 11/01 562
IL
) for LPC mode.
T1.4 562