SymbiFlow
Table Of Contents
SymbiFlow
Table Of Contents

RAMB36 features

This fuzzer emits features that only are used in the RAMB36E1 cell. There are 3 categories:

  • ECC

  • RAM extension

  • Odd address modes

Odd address modes

Most RAMB36E1 address widths are expressed by configuring the underlying RAMB18E1 to handle half of the data. So RAMB36.READ_WIDTH = 4 is expressed as RAM18_Y0.READ_WIDTH = 2 and RAM18_Y1.READ_WIDTH = 2. However two address widths (1 and 9) are odd (e.g. not divisible by 2). In these cases, a RAMB36E1 specific feature is used. So RAMB36.READ_WIDTH = 9 is expressed as:

  • RAMB18_Y0.READ_WIDTH_4

  • RAMB18_Y1.READ_WIDTH_4

  • RAMB36.BRAM36_READ_WIDTH_1

and RAMB36.READ_WIDTH = 1 is expressed as:

  • RAMB18_Y0.READ_WIDTH_1

  • RAMB18_Y1.READ_WIDTH_1

  • RAMB36.BRAM36_READ_WIDTH_1