Invention Grant
- Patent Title: Floating point to fixed point conversion
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Application No.: US16876402Application Date: 2020-05-18
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Publication No.: US10884702B2Publication Date: 2021-01-05
- Inventor: Kenneth Rovers
- Applicant: Imagination Technologies Limited
- Applicant Address: GB Kings Langley
- Assignee: Imagination Technologies Limited
- Current Assignee: Imagination Technologies Limited
- Current Assignee Address: GB Kings Langley
- Agency: Potomac Law Group, PLLC
- Agent Vincent M DeLuca
- Priority: GB1704748.1 20170324
- Main IPC: G06F5/01
- IPC: G06F5/01 ; G06F7/48 ; H03M7/24

Abstract:
A binary logic circuit converts a number in floating point format having an exponent E of ew bits, an exponent bias B given by B=2ew-1−1, and a significand comprising a mantissa M of mw bits into a fixed point format with an integer width of iw bits and a fractional width of fw bits. The circuit includes a shifter operable to receive a significand input comprising a contiguous set of the most significant bits of the significand and configured to left-shift the significand input by a number of bits equal to the value represented by k least significant bits of the exponent to generate a shifter output, wherein min {(ew−1), bitwidth(iw−2−sy)}≤k≤(ew−1) where sy=1 for a signed floating point number and sy=0 for an unsigned floating point number, and a multiplexer coupled to the shifter and configured to: receive an input comprising a contiguous set of bits of the shifter output; and output the input if the most significant bit of the exponent is equal to one.
Public/Granted literature
- US20200278834A1 Floating Point to Fixed Point Conversion Public/Granted day:2020-09-03
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