Datasheet > 存储 > SRAM> M66220FP

M66220FP

更新时间： 2024-01-12 08:30:56

品牌	Logo	应用领域
三菱 - MITSUBISHI		/
页数	文件大小	规格书
11页	140K
描述
256 x 8-BIT MAIL-BOX

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技术参数
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M66220FP 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	SDIP, SDIP42,.6	针数：	42
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.32.00.41	风险等级：	5.66
Is Samacsys：	N	最长访问时间：	70 ns
I/O 类型：	COMMON	JESD-30 代码：	R-PDIP-T42
长度：	36.7 mm	内存密度：	2048 bit
内存集成电路类型：	MULTI-PORT SRAM	内存宽度：	8
功能数量：	1	端口数量：	2
端子数量：	42	字数：	256 words
字数代码：	256	工作模式：	ASYNCHRONOUS
最高工作温度：	70 °C	最低工作温度：
组织：	256X8	输出特性：	3-STATE
封装主体材料：	PLASTIC/EPOXY	封装代码：	SDIP
封装等效代码：	SDIP42,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE, SHRINK PITCH	并行/串行：	PARALLEL
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	5.5 mm	子类别：	SRAMs
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子节距：	1.778 mm
端子位置：	DUAL	宽度：	13 mm
Base Number Matches：	1

M66220FP 数据手册

MITSUBISHI DIGITAL ASSP

M66220SP/FP

256 × 8-BIT MAIL-BOX

FUNCTIONAL DESCRIPTION

This comes into question. When both ports are operating in the write

mode as given in(4), reverse data is written into each port and the

contents of memory may become uncertain. Consequently, no result

will be guaranteed.

Arbitration Function

The M66220 has asynchronous accessibility from two independent

ports to shared memory, thus remarkably improving the throughput

of the entire processor system used in the multiport mode. On the

other hand, this accessibility causes a problem of contending for

selecting the same address in shared memory during the addressing

from both ports.

The M66220 incorporated an arbitration function circuit to solve such

problems when contentionally selecting an address from both ports.

The arbitration function decides which of A and B ports determines

an address first, and unconditionally assigns access priority to the

first-in port (At this time, the Not Ready signal holds “H”). As for the

last-in port operation, the function inhibits any write to that port from

MPU at the same time when “L” is output to the Not Ready output pin

at the port regardless of a read or write operation during the period of

address matching of both ports. If the address of the first-in port

changes after that and both ports do not have the same address, the

Not Ready output is reset to “H” and the access in the stopped state

is accepted from the last-in port. If the same address is selected by

an address input from both ports simultaneously, a decision by the

arbitration function on the chip also affords access only from one

port, and outputs “L” to the Not Ready output for the other port

invalidate any access from MPU. Tables 3 and 4 give the relationship

between the port arbitration function and port access.

If the same address is contentionally selected, the following four basic

operations are possible depending on an access mode set from both

ports:

(1) A port .......... Read

(2) A port .......... Read

(3) A port .......... Write

(4) A port .......... Write

B port .......... Read

B port .......... Write

B port .......... Read

B port .......... Write

In this case, when both ports are operating in the read mode as given

in (1), correct data is read to both ports and the contents of memory

are not destroyed. There is no special problem. If the other port is in

the read mode while one port is operating in the write mode as given

in (2) or (3), however, data is written correctly but the data read from

the other port in the read mode may change during the same cycle.

1 234 5 6 7...11

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与M66220FP相关器件

型号	品牌	描述	获取价格	数据表
M66220SP	MITSUBISHI	256 x 8-BIT MAIL-BOX	获取价格
M66220SP	RENESAS	256*8-BIT MAIL-BOX	获取价格
M66-221	MICRO-ELECTRONICS	Tone/Music Synthesizer, PBCY3, TO-92	获取价格
M66221FP	MITSUBISHI	256 x 9-BIT MAIL-BOX	获取价格
M66221SP	MITSUBISHI	256 x 9-BIT MAIL-BOX	获取价格
M66-222	MICRO-ELECTRONICS	Tone/Music Synthesizer, PBCY3, TO-92	获取价格

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