參數(shù)資料
型號(hào)： 28F400BV-T
英文描述： 4-MBIT (256K X 16. 512K X 8) SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY
中文描述： 4兆位（256 × 16。為512k × 8）SmartVoltage啟動(dòng)塊閃存系列
文件頁(yè)數(shù)： 12/44頁(yè)
文件大?。?/td> 496K
代理商： 28F400BV-T
28F400BL-T/B, 28F004BL-T/B
2.1 28F400BL Memory Organization
2.1.1 BLOCKING
The 28F400BL uses a blocked array architecture to
provide independent erasure of memory blocks. A
block is erased independently of other blocks in the
array when an address is given within the block ad-
dress range and the Erase Setup and Erase Confirm
commands are written to the CUI. The 28F400BL is
a random read/write memory, only erasure is per-
formed by block.
2.1.1.1 Boot Block Operation and Data
Protection
The 16-Kbyte boot block provides a lock feature for
secure code storage. The intent of the boot block is
to provide a secure storage area for the kernel code
that is required to boot a system in the event of pow-
er failure or other disruption during code update.
This lock feature ensures absolute data integrity by
preventing the boot block from being written or
erased when RP
Y
is not at 12V. The boot block can
be erased and written when RP
Y
is held at 12V for
the duration of the erase or program operation. This
allows customers to change the boot code when
necessary while providing security when needed.
See the Block Memory Map section for address lo-
cations of the boot block for the 28F400BL-T and
28F400BL-B.
2.1.1.2 Parameter Block Operation
The 28F400BL has 2 parameter blocks (8 Kbytes
each). The parameter blocks are intended to provide
storage for frequently updated system parameters
and configuration or diagnostic information. The pa-
rameter blocks can also be used to store additional
boot or main code. The parameter blocks however,
do not have the hardware write protection feature
that the boot block has. The parameter blocks pro-
vide for more efficient memory utilization when deal-
ing with parameter changes versus regularly blocked
devices. See the Block Memory Map section for ad-
dress locations of the parameter blocks for the
28F400BL-T and 28F400BL-B.
2.1.1.3 Main Block Operation
Four main blocks of memory exist on the 28F400BL
(3 x 128-Kbyte blocks and 1 x 96-Kbyte blocks). See
the following section on Block Memory Map for the
address location of these blocks for the 28F400BL-T
and 28F400BL-B products.
2.1.2 BLOCK MEMORY MAP
Two versions of the 28F400BL product exist to sup-
port two different memory maps of the array blocks
in order to accommodate different microprocessor
protocols for boot code location. The 28F400BL-T
memory map is inverted from the 28F400BL-B mem-
ory map.
2.1.2.1 28F400BL-B Memory Map
The 28F400BL-B device has the 16-Kbyte boot
block located from 00000H to 01FFFH to accommo-
date those microprocessors that boot from the bot-
tom of the address map at 00000H. In the
28F400BL-B the first 8-Kbyte parameter block re-
sides in memory space from 02000H to 02FFFH.
The second 8-Kbyte parameter block resides in
memory space from 03000H to 03FFFH. The
96-Kbyte main block resides in memory space from
04000H to 0FFFFH. The three 128-Kbyte main
block resides in memory space from 10000H to
1FFFFH, 20000H to 2FFFFH and 30000H to
3FFFFH (word locations). See Figure 7.
(Word Addresses)
3FFFFH
128-Kbyte MAIN BLOCK
2FFFFH
30000H
128-Kbyte MAIN BLOCK
1FFFFH
20000H
128-Kbyte MAIN BLOCK
0FFFFH
10000H
96-Kbyte MAIN BLOCK
03FFFH
04000H
8-Kbyte PARAMETER BLOCK
02FFFH
03000H
8-Kbyte PARAMETER BLOCK
01FFFH
02000H
16-Kbyte BOOT BLOCK
00000H
Figure 7. 28F400BL-B Memory Map
12
相關(guān)PDF資料
PDF描述
28F400BX-B 4-MBIT (256K X 16. 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY
28F400BX-T 4-MBIT (256K X 16. 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY
28F800B5 Dual-Slot, PCMCIA Analog Power Controller
28F800BV-B Dual-Slot, PCMCIA Analog Power Controller
28F800BV-T 8-MBIT (512K X 16. 1024K X 8) SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
28F400BV-T/B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Book Block Flash Memory F
28F400BV-TB 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:4-MBIT (256K X 16, 512K X 8)SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY
28F400BX-B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-MBIT (256K X 16. 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY
28F400BX-T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-MBIT (256K X 16. 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY
28F400BX-T/B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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