当前位置:首页 > EDA > 电子设计自动化
[导读]在IC设计中,我们有时会使用深度很大,位宽很小的ram。例如深度为1024,位宽为4bit的ram。此类的ram有个明显的缺点:形状狭长,不利于布局布线、导致读写接口走线过长,不利于时序收敛。

IC设计中,我们有时会使用深度很大,位宽很小的ram。例如深度为1024,位宽为4bit的ram。此类的ram有个明显的缺点:形状狭长,不利于布局布线、导致读写接口走线过长,不利于时序收敛。

此时为了方便布局布线和时序收敛,我们通常会进行折叠设计。如下图所示,深度为1024,位宽为4bit的双端口1r1w的ram,有一个读接口,一个写接口,支持同时读写操作,出于以上考虑,我们会进行折叠设计,采用2个128x32的1r1w的ram实现。如图所示:两个2个128x32存储的内容完全一致。

无论是否进行折叠设计,ram接口信号位宽均一致。读写地址位宽为10bit,读写数据位宽为4bit。部分ram读写接口信号如下

信号

位宽

描述

waddr

10

写地址

wen

1

写使能信号,1表示写有效

wdata

4

写数据

raddr

10

读地址

ren

1

读使能信号,1表示读有效

rdata

4

读数据


IC设计:ram的折叠设计

信号位宽描述

waddr10写地址

wen1写使能信号,1表示写有效

wdata4写数据

raddr10读地址

ren1读使能信号,1表示读有效

rdata4读数据

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" alt="IC设计:ram的折叠设计" />

进行写操作时:

使用waddr[9:5] 作为读地址,读128x32_ram_u0,获得rdata[31:0]

使用waddr[4:0] 选择rdata[31:0]中一个bit,

使用wdata[0:0]进行替换,得到写入数据wdata_inter[31:0]

使用waddr_dly[9:5] 作为写地址,将wdata_inter[31:0]作为写数据同时写入128x32_ram_u0和128x32_ram_u1。 进行读操作时:

使用raddr[9:5] 作为读地址,读128x32_ram_u1,获得rdata1[31:0]

使用raddr[4:0] 选择rdata1[31:0]中一个bit,赋值给o_rdata。

IC设计:ram的折叠设计

为什么需要用两个128x32的ram?

因为1024x1_1r1w_ram_wrapper需要同时支持读写操作,而在折叠设计中,写操作需要先读ram,读操作也需要读ram,如果仅仅使用1个128x32的ram,就会出现有两个读请求同时产生,因此为了避免出现此冲突,需要2个128x32的ram才能实现

本站声明: 本文章由作者或相关机构授权发布,目的在于传递更多信息,并不代表本站赞同其观点,本站亦不保证或承诺内容真实性等。需要转载请联系该专栏作者,如若文章内容侵犯您的权益,请及时联系本站删除。
换一批
延伸阅读

Bitmap是一种通过位映射来高效存储和查询数据的技术,它在处理大规模数据集时能够有效地节省内存空间。Bitmap技术特别适用于需要对大量数据进行存在性检查的场景,比如用户签到、页面访问等,它可以显著节省内存空间。

关键字: IC设计 RAM bitmap

在ASIC设计中,项目会期望设计将代码写成clk-gating风格,以便于DC综合时将寄存器综合成clk-gating结构,其目的是为了降低翻转功耗。因为当控制信号(vld_in)无效时,使用了clk-gating后的...

关键字: IC设计 clock-gating ASIC

通常block的input和output信号存在时序问题时,我们通常采用寄存器打拍的方式,在两个block直接插入reg,从而解决时序问题。

关键字: IC设计 RR调度原理 AXI信号

8b10b编码作为数字通信领域中的一项重要线路编码方案,其核心理念在于将每8位数据映射到10位编码中。这个映射过程严格按照特定规则进行,旨在保证编码中的电平转换足够,以维持信号的直流平衡,并提供足够的时钟信息,使接收端能...

关键字: FPGA 8b/10b编码 IC设计

在FPGA和IC设计领域,经常会面临一个挑战:多个端口同时竞争一个端口的数据。在这种情况下,采用RR调度策略可能是一种解决方案。

关键字: FPGA 嵌入式系统 IC设计

May 9, 2024 ---- 据TrendForce集邦咨询研究显示,2023年全球前十大IC设计业者营收合计约1,677亿美元,年增长12%,关键在于NVIDIA(英伟达)带动整体产业向上,其营收年成长幅度高达10...

关键字: NVIDIA IC设计 AI

存储器是计算机系统中的关键组件,负责存储程序指令和数据,是实现计算和信息处理的基础。根据其工作原理、存储容量、访问速度、稳定性以及持久性等诸多特性,存储器可以被细分为多个类别。本篇文章将详细介绍存储器的主要分类,并探讨各...

关键字: 存储器 RAM

提供业界最高容量的闪存、RAM和GPIO组合,支持Matter over Thread

关键字: 闪存 RAM 物联网

2024国际集成电路展览会暨研讨会(IIC Shanghai)期间,以“芯·未来”为主题的2024中国IC领袖峰会暨中国IC设计成就奖颁奖典礼于3月29日在上海张江召开,安谋科技(中国)有限公司(以下简称“安谋科技”)再...

关键字: IC设计 集成电路 AI

3月29日,由知名媒体ASPENCORE主办的“中国IC设计成就奖”(2024 CHINA IC DESIGN AWARDS)颁奖典礼在上海举办。江苏谷泰微电子有限公司凭借在模拟芯片及信号链芯片领域的出色表现,荣获202...

关键字: IC设计 信号链芯片 模拟芯片
关闭