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参数资料
| 型号： | AT49LW040-33JC |
| 厂商： | ATMEL CORP |
| 元件分类： | DRAM |
| 英文描述： | 8-megabit and 4-megabit Firmware Hub Flash Memory |
| 中文描述： | 512K X 8 FLASH 3V PROM, 11 ns, PQCC32 |
| 封装： | PLASTIC, MS-016AE, LCC-32 |
| 文件页数： | 10/34页 |
| 文件大小： | 465K |
| 代理商： | AT49LW040-33JC |
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10
AT49LW080/040
1966C
–
FLASH
–
03/02
WRITE:
Write operations consist of preamble, data, TAR and SYNC fields as shown in
Figure 3 and described in Table 6.
WRITE CYCLES, SINGLE BYTE:
All devices that support FWH Memory Write cycles
must support single-byte writes. FWH Memory Write cycles use the same preamble as
FWH Memory Read cycles.
For write cycles, after the preamble, the master writes the low nibble, then the high nib-
ble of data. After that the master drives a TAR field to give ownership of the bus to the
FWH. After the second clock of the TAR phase, the target device assumes the bus and
begins driving SYNC values. A TAR field to give control back to the master follows this.
Figure 3.
FWH Single-byte Write Waveforms
Note:
1. Field contents are valid on the rising edge of the present clock cycle.
IDSEL
MADDR
MSIZE
TAR
TAR
SYNC
CLK
FWH4
FWH[3:0]
DATA
PREAMBLE
START
Table 6.
FWH Write Cycle
Clock Cycle
Field Name
Field
Contents
(1)
FWH[3:0]
FWH[3:0]
Direction
Comments
1
START
1110b
IN
FWH4 must be active (low) for the part to respond. Only the last
start field (before FWH4 transitioning high) should be recognized.
The START field contents indicate an FWH memory write cycle.
2
IDSEL
0000b
to
1111b
IN
Indicates which FWH device should respond. If the IDSEL (ID
select) field matches the value ID[3:0], then that particular device
will respond to subsequent commands.
3 - 9
MADDR
YYYY
IN
These seven clock cycles make up the 28-bit memory address.
YYYY is one nibble of the entire address. Addresses are
transferred most significant nibble first.
10
MSIZE
0000b (1 byte)
IN
The FWH only supports single-byte writes.
11
DATA
YYYY
IN
This field is the least significant nibble of the data byte. This data
is either the data to be programmed into the Flash memory or
any valid Flash command.
12
DATA
YYYY
IN
This field is the most significant nibble of the data byte.
13
TAR0
1111b
IN
then float
In this clock cycle, the master (ICH) has driven the bus to all 1s
and then floats the bus prior to the next clock cycle. This is the
first part of the bus
“
turnaround cycle
”
.
14
TAR1
1111b (float)
Float then
OUT
The FWH takes control of the bus during this cycle. During the
next clock cycle it will be driving the
“
sync
”
data.
15
RSYNC
0000b
OUT
The FWH outputs the values 0000, indicating that it has received
data or a Flash command.
16
TAR0
1111b
OUT
then Float
The FWH Flash memory drives FWH0 - FWH 3 to 1111b to
indicate a turnaround cycle.
17
TAR1
1111b (float)
Float then
IN
The FWH Flash memory floats its outputs, the master (ICH)
takes control of FWH3 - FWH0.
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相关代理商/技术参数 |
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|---|---|
| AT49LW080-33JC | 功能描述:IC FLASH 8MBIT 33MHZ 32PLCC RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1 系列:- 格式 - 存储器:RAM 存储器类型:SDRAM 存储容量:256M（8Mx32） 速度:143MHz 接口:并联 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:90-VFBGA 供应商设备封装:90-VFBGA（8x13） 包装:托盘 其它名称:Q2841869 |
| AT49LW080-33JC SL383 | 功能描述:IC FLASH 8MBIT 33MHZ 32PLCC RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1 系列:- 格式 - 存储器:RAM 存储器类型:SDRAM 存储容量:256M（8Mx32） 速度:143MHz 接口:并联 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:90-VFBGA 供应商设备封装:90-VFBGA（8x13） 包装:托盘 其它名称:Q2841869 |
| AT49LW080-33JC-T | 功能描述:IC FLASH 8MBIT 33MHZ 32PLCC 制造商:microchip technology 系列:- 包装:带卷（TR） 零件状态:停產 存储器类型:非易失 存储器格式:闪存 技术:FLASH 存储容量:8Mb （1M x 8） 时钟频率:33MHz 写周期时间 - 字，页:300μs 存储器接口:并联 电压 - 电源:3 V ~ 3.6 V 工作温度:0°C ~ 85°C（TC） 安装类型:表面贴装 封装/外壳:32-LCC（J 形引线） 供应商器件封装:32-PLCC 基本零件编号:AT49LW080 标准包装:750 |
| AT49LW080-33JX | 功能描述:IC FLASH 8MBIT 33MHZ 32PLCC RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1 系列:- 格式 - 存储器:RAM 存储器类型:SDRAM 存储容量:256M（8Mx32） 速度:143MHz 接口:并联 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:90-VFBGA 供应商设备封装:90-VFBGA（8x13） 包装:托盘 其它名称:Q2841869 |
| AT49LW080-33JX SL383 | 功能描述:IC FLASH 8MBIT 33MHZ 32PLCC RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1 系列:- 格式 - 存储器:RAM 存储器类型:SDRAM 存储容量:256M（8Mx32） 速度:143MHz 接口:并联 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:90-VFBGA 供应商设备封装:90-VFBGA（8x13） 包装:托盘 其它名称:Q2841869 |
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