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AR# 4227

4.1i CORE Generator - Data width is limited to 31 or less for 4000 Single-Port RAM, Dual-Port RAM, Registered ROM, and SDA FIR Filter


Keywords: data, width, limited, 31, single, dual, port, RAM, ROM, SDA, FIR, FIFO

Urgency: Standard

General Description:
The data width on the following functions is currently limited to 31:

- Registered Single-Port RAM
- Registered Dual-Port RAM
- Registered ROM
- SDA (Serial Distributed Arithmetic) FIR filter
- Registered FIFO

(On the PDA FIR filter, the input data width is limited to 24.)


The limitations on the input data width for these particular modules are associated with the fact that the input coefficient values are represented with VHDL integer data types. VHDL integer data types are 32-bit data types by definition, and using 32-bit data types as inputs in these applications may cause arithmetic overflow problems on the outputs during behavioral simulation.

(Ref.#: 104045)
AR# 4227
Date Created 07/12/1998
Last Updated 10/09/2003
Status Archive
Type General Article