Entity: DspPreSubMult
- File: DspPreSubMult.vhd
Diagram
Description
Company : SLAC National Accelerator Laboratory
Description: Generalized DSP inferred multiplier with pre-adder configured as subtractor (based on UG901)
Equation: p = (a - b) x c
This file is part of 'SLAC Firmware Standard Library'. It is subject to the license terms in the LICENSE.txt file found in the top-level directory of this distribution and at: https://confluence.slac.stanford.edu/display/ppareg/LICENSE.html. No part of 'SLAC Firmware Standard Library', including this file, may be copied, modified, propagated, or distributed except according to
the terms contained in the LICENSE.txt file.
Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| TPD_G | time | 1 ns | |
| RST_POLARITY_G | sl | '1' | '1' for active high rst, '0' for active low |
| USE_DSP_G | string | "yes" | |
| PIPE_STAGES_G | natural range 0 to 1 | 0 | |
| A_WIDTH_G | natural | 12 | |
| B_WIDTH_G | natural | 16 | |
| C_WIDTH_G | natural | 17 |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| clk | in | sl | |
| rst | in | sl | |
| ibValid | in | sl | Inbound Interface |
| ibReady | out | sl | |
| ain | in | slv(A_WIDTH_G-1 downto 0) | |
| bin | in | slv(B_WIDTH_G-1 downto 0) | |
| cin | in | slv(C_WIDTH_G-1 downto 0) | |
| obValid | out | sl | Outbound Interface |
| obReady | in | sl | |
| pOut | out | slv(B_WIDTH_G + C_WIDTH_G downto 0) |
Signals
| Name | Type | Description |
|---|---|---|
| r | RegType | |
| rin | RegType | |
| tReady | slv(1 downto 0) | |
| p | slv(B_WIDTH_G + C_WIDTH_G downto 0) |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| REG_INIT_C | RegType | ( ibReady => '0', tReady => '0', tValid => (others => '0'), diff => (others => '0'), c => (others => '0'), p => (others => '0')) |
Types
| Name | Type | Description |
|---|---|---|
| RegType |
Processes
- comb: ( ain, bin, cin, ibValid, r, rst, tReady )
- seq: ( clk )
Instantiations
- U_Pipe: surf.FifoOutputPipeline