參數(shù)資料
型號(hào)： A49LF004
廠商： AMIC Technology Corporation
英文描述： 4 Mbit CMOS 3.3Volt-only Firmware Hub Flash Memory
中文描述： 4兆位的CMOS 3.3Volt只閃存固件集線器
文件頁(yè)數(shù)： 10/32頁(yè)
文件大小： 595K
代理商： A49LF004
A49LF004
PRELIMINARY (November, 2003, Version 0.0)
9
AMIC Technology, Corp.
Table 4: FWH Register Memory Map
General Purpose Inputs Register
The GPI_REG (General Purpose Inputs Register) passes
the state of FGPI[4:0] pins at power-up on the A49LF004. It
is recommended that the FGPI[4:0] pins are in the desired
state before FWH4 is brought low for the beginning of the
bus cycle, and remain in that state until the end of the cycle.
There is no default value since this is a pass-through
register. The GPI register for the boot device appears at
FFBC0100H in the 4 GByte system memory map, and will
appear elsewhere if the device is not the boot device.
Register is not available for read when the device is in
Erase/Program operation. See Table 5
for the GPI_REG bits
and function.
Table 5: General Purpose Inputs Register
Block Locking Registers
A49LF004 provides software controlled lock protection
through a set of Block Locking registers. The Block Locking
Registers are read/write registers and it is accessible
through standard addressable memory locations specified in
Table 6. Unused register locations will read as 00H.
Write-Lock.
The Write-Lock Bit determines whether the
contents of the Block can be modified (using the Program or
Erase Command). When the Write-Lock Bit is set to ‘1’, the
block is write protected; any operations that attempt to
change the data in the block will fail and the Status Register
will report the error. When the Write-Lock Bit is reset to ‘0’,
the block is not write protected through the Locking Register
and may be modified unless write protected through some
other means. If Top Block Lock, TBL#, is Low, V
IL
, then the
Top Block (Block 7) is write protected and cannot be
modified.
Similarly, if Write Protect, WP#, is Low, V
IL
, then the Main
Blocks (Blocks 0 to 6) are write protected and cannot be
modified. After power-up or reset the Write-Lock Bit is
always set to ‘1’ (write protected).
Read-Lock.
The Read-Lock bit determines whether the
contents of the Block can be read (from Read mode). When
the Read-Lock Bit is set to ‘1’, the block is read protected;
any operation that attempts to read the contents of the block
will
read 00h instead. When the Read-Lock Bit is reset to ‘0’,
read
operations in the Block return the data programmed into the
block as expected. After power-up or reset the Read-Lock
Bit is always reset to ‘0’ (not read protected).
Lock-Down.
The Lock-Down Bit provides a mechanism for
protecting software data from simple hacking and malicious
attack. When the Lock-Down Bit is set to ‘1’, further
modification to the Write-Lock, Read-Lock and Lock-Down
Bits cannot be performed. A reset or power-up is required
before changes to these bits can be made. When the Lock-
Down Bit is reset to ‘0’, the Write-Lock, Read-Lock and
Lock-Down Bits can be changed.
Memory
Address
Mnemonic
Register Name
Default
Type
FFBF0002h
T_BLOCK_LK
Top Block Lock Register (Block 7)
01h
R/W
FFBE0002h
T_MINUS01_LK
Top Block [-1] Lock Register (Block 6)
01h
R/W
FFBD0002h
T_MINUS02_LK
Top Block [-2] Lock Register (Block 5)
01h
R/W
FFBC0002h
T_MINUS03_LK
Top Block [-3] Lock Register (Block 4)
01h
R/W
FFBB0002h
T_MINUS04_LK
Top Block [-4] Lock Register (Block 3)
01h
R/W
FFBA0002h
T_MINUS05_LK
Top Block [-5] Lock Register (Block 2)
01h
R/W
FFB90002h
T_MINUS06_LK
Top Block [-6] Lock Register (Block 1)
01h
R/W
FFB80002h
T_MINUS07_LK
Top Block [-7] Lock Register (Block 0)
01h
R/W
FFBC0100h
FGPI_REG
FWH General Purpose Input Register
N/A
R
FFBC0000h
MANUF_REG
Manufacturer ID Register
37h
R
FFBC0001h
DEV_REG
Device ID Register
95h
R
FFBC0003h
CONT_REG
Continuation ID Register
7Fh
R
Pin Number
Bit
Bit
Name
Function
32-PLCC
32-TSOP
7:5
-
Reserved
-
-
4
FGPI[4]
GPI_REG Bit 4
30
6
3
FGPI[3]
GPI_REG Bit 3
3
11
2
FGPI[2]
GPI_REG Bit 2
4
12
1
FGPI[1]
GPI_REG Bit 1
5
13
0
FGPI[0]
GPI_REG Bit 0
6
14
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