Verilog HDL: Hybrid Variable Coefficient Soft Multiplier
This design implements 2-input, 15-bit variable coefficient hybrid multiplication using M512 RAM blocks as look-up tables (LUTs). For more details on the design, refer to AN 306: Implementing Multipliers in FPGA Devices (PDF).
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The use of this design is governed by, and subject to, the terms and conditions of the Altera Hardware Reference Design License Agreement.
Table 1 shows the Hybrid Variable Coefficient Soft Multiplier design example port listing.
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Table 1. Hybrid Variable Coefficient Soft Multiplier Port Listing
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Port Name
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Type
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Description
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input_I[15..0]
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Input
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One of the 16-bit inputs to the multiplier. Two bits of this input are entered to the multiplier every clock cycle till the entire bus is completely loaded.
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input_Q[15..0]
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Input
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One of the 16-bit inputs to the multiplier. Two bits of this input are entered to the multiplier every clock cycle till the entire bus is completely loaded.
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sload_data
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Input
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Active high. Specifies the start of a new data set and new multiplication operation.
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coef_in[17..0]
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Input
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Coefficient update data port. Pre-calculated coefficient values on this port will be stored in to locations specified by coef_add_in when the coef_wren signal is enabled.
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coef_add_in[4..0]
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Input
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Coefficient update address port. This specifies which address location a particular pre-calculated coefficient value is written to.
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coef_wren
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Input
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Coefficient write/update enable. If coef_wren is high, the RAM blocks will start to accept pre-calculated coefficient values on the coef_in port and store them in the locations specified by the coef_add_in signal. This signal has to remain high till all the pre-calculated coefficient values have been updated in the RAM blocks.
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clk
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Input
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Clock
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sclr
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Input
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Active high synchronous clear
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result[31..0]
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Output
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The output is a 32-bit signed value.
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result_valid
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Output
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Indicates when the output is the valid result of a complete multiplication. The signal will go high for the time that the output is valid.
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