- 您现在的位置：买卖IC网 > PDF目录364573 > A28F400BR-T 4-MBIT (256K X 16. 512K X 8) SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY PDF资料下载
参数资料
| 型号： | A28F400BR-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。为512k × 8）SmartVoltage启动块闪存系列 |
| 文件页数： | 12/36页 |
| 文件大小： | 457K |
| 代理商： | A28F400BR-T |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
A28F400BR-T/B
E
12
ADVANCE INFORMATION
3.1
Bus Operations
Flash memory reads, programs and erases in-
system via the local CPU. All bus cycles to or from
the flash memory conform to standard micro-
processor bus cycles. These bus operations are
summarized in Tables 2 and 3.
3.2
Read Operations
The boot block flash device has three user read
modes: array, intelligent identifier, and status
register. Status register read mode will be
discussed, in detail, in Section 3.3.2.
3.2.1
READ ARRAY
When RP# transitions from V
IL
(reset) to V
IH
, the
device will be in the read array mode and will
respond to the read control inputs (CE#, address
inputs, and OE#) without any commands being
written to the CUI.
When the device is in the read array mode, five
control signals must be controlled to obtain data at
the outputs.
WE# must be logic high (V
IH
)
CE# must be logic low (V
IL
)
OE must be logic low (V
IL
)
RP# must be logic high (V
IH
)
BYTE# must be logic high or logic low.
In addition, the address of the desired location must
be applied to the address pins. Refer to Figures 10
and 11 for the exact sequence and timing of these
signals.
If the device is not in read array mode, as would be
the case after a program or erase operation, the
Read Mode command (FFH) must be written to the
CUI before reads can take place.
3.2.1.1
Output Control
With OE# at logic-high level (V
IH
), the output from
the device is disabled and data Input/Output pins
(DQ[0:15] or DQ[0:7]) are tri-stated.
3.2.1.2
Input Control
With WE# at logic-high level (V
IH
), input to the
device is disabled.
3.2.2
INTELLIGENT IDENTIFIERS
The intelligent identifiers of the SmartVoltage boot
block components are identical to the boot block
products that operate only at 12V V
PP
. The
manufacturer and device codes are read via the
CUI or by taking the A
9
pin to V
ID
. Writing 90H to
the CUI places the device into intelligent identifier
read mode. In this mode, A
0
= 0 outputs the
manufacturer’s identification code and A
0
= 1
outputs the device code. When BYTE# is at a logic
low, only the lower byte of the above signatures is
read and DQ
15
/A
-1
is a “don’t care” during intelligent
identifier mode. See the table below for product
signatures. A Read Array command must be written
to the memory to return to the read array mode.
Table 4. Intelligent Identifier Table
Product
Mfr. ID
Device ID
-T
(Top Boot)
-B
(Bottom Boot)
28F400
0089 H
4470 H
4471 H
3.3
WRITE OPERATIONS
3.3.1
COMMAND USER INTERFACE (CUI)
The Command User Interface (CUI) serves as the
interface between the microprocessor and the
internal chip controller. Commands are written to
the CUI using standard microprocessor write
timings. The available commands are Read Array,
Read Intelligent Identifier, Read Status Register,
Clear Status Register, Program and Erase
(summarized in
Table
s 5 and 6). For Read
commands, the CUI points the read path at either
the array, the intelligent identifier, or the Status
Register depending on the command received. For
Program or Erase commands, the CUI informs the
Write State Machine (WSM) that a program or
erase has been requested. During the execution of
a Program command, the WSM will control the
programming sequences and the CUI will
only
respond to status reads. During an erase cycle, the
相关PDF资料 |
PDF描述 |
|---|---|
| A28F400BX-B | 4-MBIT (256K x16. 512K x8) BOOT BLOCK FLASH MEMORY FAMILY |
| A28F400BR-TB | Toggle Switch; Circuitry:DPDT; Switch Operation:On-On; Contact Current Max:6A; Actuator Style:Bat; Switch Terminals:Through Hole; Current Rating:3A; Leaded Process Compatible:Yes; Mounting Type:PCB; Features:Standard Actuator RoHS Compliant: Yes |
| A28F400BX-T | 4-MBIT 256K x16, 512K x8 BOOT BLOCK FLASH MEMORY FAMILY |
| A29-1 | 10 TO 1500 MHz CASCADABLE AMPLIFIER |
| A290011SERIES | 128K X 8 Bit CMOS 5.0 Volt-only. Boot Sector Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A28F400BR-T/B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:A28F400BR-T/B |
| A28F400BR-TB | 制造商:INTEL 制造商全称:Intel Corporation 功能描述:4-MBIT (256K X 16, 512K X 8) SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY |
| A28F400BX-B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4-MBIT (256K x16. 512K x8) BOOT BLOCK FLASH MEMORY FAMILY |
| A28F400BX-T | 制造商:INTEL 制造商全称:Intel Corporation 功能描述:4-MBIT 256K x16, 512K x8 BOOT BLOCK FLASH MEMORY FAMILY |
| A28F400BX-T/B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:A28F400BX-T/B |
发布紧急采购，3分钟左右您将得到回复。