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PDF A49LF004 Data sheet ( Hoja de datos )
| Número de pieza | A49LF004 | |
| Descripción | 4 Mbit CMOS 3.3Volt-only Firmware Hub Flash Memory | |
| Fabricantes | AMIC Technology | |
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Preliminary
A49LF004
4 Mbit CMOS 3.3Volt-only Firmware Hub Flash Memory
Document Title
4 Mbit CMOS 3.3 Volt-only Firmware Hub Flash Memory
Revision History
Rev. No. History
0.0 Initial issue
Issue Date
November 21, 2003
Remark
Preliminary
PRELIMINARY (November, 2003, Version 0.0)
AMIC Technology, Corp.
1 page  
A49LF004
Table 1: Pin Description
Symbol
Pin Name
Type
Interface
A/A
Mux
FWH
Descriptions
A10-A0
Address
IN X
Inputs for addresses during Read and Write operations in A/A
Mux mode. Row and column addresses are latched by R/C# pin.
I/O7-I/O0
Data
I/O X
To output data during Read cycle and receive input data during
Write cycle in A/A Mux mode. The outputs are in tri-state when
OE# is high.
OE#
Output Enable
IN X
To control the data output buffers.
WE#
Write Enable
IN X
To control the Write operations.
To determine which interface is operational. When held high, A/A
IC
Interface
Configuration Pin
IN
Mux mode is enabled and when held low, FWH mode is enabled.
X X This pin must be setup at power-up or before return from reset
and not change during device operation. This pin is internally
pulled down with a resistor between 20-100 KΩ.
INIT#
Initialize
IN
This is the second reset pin for in-system use. INIT# and RST#
X pins are internally combined and initialize a device reset when
driven low.
ID[3:0]
Identification Inputs IN
These four pins are part of the mechanism that allows multiple
FWH devices to be attached to the same bus. To identify the
component, the correct strapping of these pins must be set. The
X boot device must have ID[3:0]=0000 and it is recommended that
all subsequent devices should use sequential up-count
strapping. These pins are internally pulled down with a resistor
between 20-100 KΩ.
FGPI[4:0]
General Purpose
Inputs
IN
These individual inputs can be used for additional board
flexibility. The state of these pins can be read immediately at
X
boot, through FWH internal 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 FGPI pins must not be floated.
TBL#
Top Block Lock
IN
To prevent any write operations to the Boot Block when driven
X
low, regardless of the state of the block lock registers. When
TBL# is high it disables hardware write protection for the top
Boot Block. This pin cannot be left unconnected.
FWH[3:0]
FWH I/Os
I/O
X I/O Communications in FWH mode.
CLK
Clock
IN
X
To provide a clock input to the device. This pin is the same as
that for the PCI clock and adheres to the PCI specifications.
FWH4
FWH Input
IN
X Input communication in FWH mode.
RST#
Reset
IN X X To reset the operation of the device
WP#
Write Protect
IN
When low, prevents any write operations to all but the highest
X addressable block. When WP# is high it disables hardware write
protection for these blocks. This pin cannot be left unconnected.
R/C#
Row/Column Select IN
X
This pin determines whether the address pins are pointing to the
row addresses or the column addresses in A/A Mux mode.
RB#
Ready/Busy#
OUT X
To determine if the device is busy in write operations. Valid only
in A/A Mux mode.
RES
Reserved
X Reserved. These pins must be left unconnected.
VDD
Power Supply
PWR X
X To provide power supply (3.0-3.6Volt).
VSS
Ground
PWR X
X Circuit ground. All VSS pins must be grounded.
NC No Connection
X X Unconnected pins.
1. IN=Input, OUT=output, I/O=Input/Output, PWR=Power
PRELIMINARY (November, 2003, Version 0.0)
4
AMIC Technology, Corp.
5 Page 
A49LF004
Table 6: Lock Register Bit Definition
Data
00h
01h
02h
03h
04h
05h
06h
07h
Reserved
Bit 7:3
00000
00000
00000
00000
00000
00000
00000
00000
Read-Lock
Bit 2
0
0
0
0
1
1
1
1
Lock-Down
Bit 1
0
0
1
1
0
0
1
1
Write-Lock
Bit 0
0
1
0
1
0
1
0
1
Function
Full Access.
Write locked. Default state at power-up.
Locked open (full access locked down).
Write-locked down.
Read locked.
Read and Write locked.
Read-locked down
Read- and Write-locked down
Data
7:3
2
1
0
Function
Reserved
Read-Lock
1 = Prevents read operations in the block where set
0 = Normal operation for reads in the block where clear. This is the default state.
Lock-Down
1 = Prevents further set or clear operations to the Write-Lock and Read-Lock bits. Lock-Down only can be set
but not clear. The block will remain lock-down until reset (with RST# or INIT# being Low), or until the device
is power-on reset.
0 = Normal operation for Write-Lock and Read-Lock bit altering in the block where clear. This is the default state.
Write-Lock
1 = Prevents program or erase operations in the block where set. This is the default state.
0 = Normal operation for programming and erase in the block where clear.
ADDRESS/ADDRESS MULTIPLEXED (A/A
MUX) MODE
Device Operation
Commands are used to initiate the memory operation
functions of the device. The data portion of the software
command sequence is latched on the rising edge of WE#.
During the software command sequence the row address is
latched on the falling edge of R/C# and the column address
is latched on the rising edge of R/C#. Refer to Table 7 and
Table 8 for operation modes and the command sequence.
Read
The Read operation of the A49LF004 device is controlled by
OE#. OE# is the output control and is used to gate data from
the output pins. Refer to the Read cycle timing diagram,
Figure 10 for further details.
Reset
A VIL on RST# pin initiates a device reset.
Byte-Program Operation
The A49LF004 device is programmed on a byte-by-byte
basis. Before programming, one must ensure that the block,
in which the byte which is being programmed exists, is fully
erased. The Byte-Program operation is initiated by executing
a four-byte command load sequence for Software Data
Protection with address and data in the last byte sequence.
During the Byte-Program operation, the row address (A10-
A0) is latched on the falling edge of R/C# and the column
Address (A21-A11) is latched on the rising edge of R/C#.
The data bus is latched in the rising edge of WE#. See
Figure 11 for Program operation timing diagram, Figure 14
for timing waveforms, and Figure 19 for its flowchart. During
the Program operation, the only valid reads are Data#
Polling and Toggle Bit. During the internal Program
operation, the host is free to perform additional tasks. Any
commands written during the internal Program operation will
be ignored.
PRELIMINARY (November, 2003, Version 0.0)
10
AMIC Technology, Corp.
11 Page | ||
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| PDF Descargar | [ Datasheet A49LF004.PDF ] | |
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