OL-DFFRAM

OpenLane hardened DFFRAM macros. This repo provides three ready to use single port DFFRAM macros:

• 128x32 (512 bytes)
• 256x32 (1024 bytes)
• 512x32 (2048 bytes)

Read and Write Operations

The DFFRAM adheres to the SRAM read/write operation. The following timing diagram explains its operation.

Timing Parameters

Parameters	DFRAM128x32	DFFRAM256x32	DFFRAM512x32
TC (min)	25 ns	25 ns	25 ns
T1 (min)	6.8303 ns	8.5061 ns	6.425 ns
T2 (min)	9.6186 ns	8.5881 ns	8.3642 ns
T3 (min)	6.7497 ns	6.3386 ns	4.1659 ns
T4 (max)	7.7625 ns	14.4169 ns	9.9347 ns

DFFRAM dimensions

IP	W(um)	L(um)
DFRAM128x32	553.890	564.610
DFRAM256x32	1153.835	536.015
DFRAM512x32	1186.960	1021.295

Installation

To install OL-DFFRAM via IPM (recommended)

Make sure that you have IPM installed locally, to install IPM please follow the instructions in IPM's repo

After making sure that IPM is installed, you can install DFFRAM using:

    ipm install DFFRAM<size>

    #For example
    ipm install DFFRAM256x32

To install OL-DFFRAM manually (not recommended)

Clone the OL-DFFRAM repo and use it inside your project

    cd <your_project_root>
    git clone https://github.com/efabless/OL-DFFRAM.git