Intel FPGA Integer Arithmetic IP Cores User Guide

ID 683490
Date 10/05/2020
Public
Document Table of Contents

10.6. Parameters

The following table lists the parameters for the ALTMULT_ACCUM IP core.

Table 44.  ALTMULT_ACCUM Parameters
Parameter Name Type Required Description
ACCUM_DIRECTION String No Specifies whether the accumulator performs an add or subtract function. Values are ADD and SUB. When this parameter is set to ADD, the accumulator adds the product to the current accumulator value. When this parameter is set to SUB, the accumulator subtracts the product from the current accumulator value. If omitted the default value is ADD. This parameter is ignored if the addnsub port is used.
ACCUM_SLOAD_ACLR String No Specifies the asynchronous clear signal for the accum_sload port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3. This parameter is ignored if the accum_sload port is unused.
ACCUM_SLOAD_PIPELINE_ACLR String No Specifies the asynchronous clear signal for the second register on the accum_sload port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3. This parameter is ignored if the accum_sload port is unused.
ACCUM_SLOAD_PIPELINE_REG String No Specifies the clock signal for the second register on the accum_sload port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the accum_sload port is unused.
ACCUM_SLOAD_REG String No Specifies the clock signal for the accum_sload port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the accum_sload port is unused.
ADDNSUB_ACLR String No Specifies the asynchronous clear for the addnsub port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR0. This parameter is ignored if the addnsub port is unused.
ADDNSUB_PIPELINE_ACLR String No Specifies the asynchronous clear for the second register on the addnsub port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR0. This parameter is ignored if the addnsub port is unused.
ADDNSUB_PIPELINE_REG String No Specifies the clock for the second register on the addnsub port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the addnsub port is unused.
ADDNSUB_REG String No Specifies the clock for the addnsub port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the addnsub port is unused.
DSP_BLOCK_BALANCING String No Specifies whether to use DSP block balancing. Values are UNUSED, Auto, DSP blocks, Logic Elements, Off, Simple 18-bit Multipliers, Simple Multipliers, and Width 18-bit Multipliers.
EXTRA_ACCUMULATOR_LATENCY String No Adds the number of clock cycles of latency specified by the OUTPUT_REG parameter to the accumulator portion of the DSP block.
EXTRA_MULTIPLIER_LATENCY Integer No Specifies the number of clock cycles of latency for the multiplier portion of the DSP block. If the MULTIPLIER_REG parameter is specified, then the specified clock port is used to add the latency. If the MULTIPLIER_REG parameter is set to UNREGISTERED, then the clock0 port is used to add the latency.
INPUT_ACLR_A String No Specifies the asynchronous clear port for the dataa[] port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3.
INPUT_ACLR_B String No Specifies the asynchronous clear port for the datab[] port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3.
INPUT_REG_A String No Specifies the clock port for the dataa[] port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0.
INPUT_REG_B String No Specifies the clock port for the datab[] port. Values are UNREGISTERED, CLOCK0, CLOCK1, and CLOCK2. If omitted, the default value is CLOCK0.
INTENDED_DEVICE_FAMILY String No This parameter is used for modeling and behavioral simulation purposes. The parameter editor calculates the value for this parameter.
LPM_HINT String No

When you instantiate a library of parameterized modules (LPM) function in a VHDL Design File (.vhd), you must use the LPM_HINT parameter to specify an Intel® -specific parameter. For example: LPM_HINT = "CHAIN_SIZE = 8, ONE_INPUT_IS_CONSTANT = YES"

The default value is UNUSED.
LPM_TYPE String No Identifies the library of parameterized modules (LPM) entity name in VHDL design files.
MULTIPLIER_ACLR String No Specifies the asynchronous clear signal for the register immediately following the multiplier. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3.
MULTIPLIER_REG String No Specifies the clock signal for the register that immediately follows the multiplier. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0.
OUTPUT_ACLR String No Specifies the asynchronous clear signal for the registers on the outputs. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3.
OUTPUT_REG String No Specifies the clock signal for the registers on the outputs. Values are CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted the default value is CLOCK0.

You must enable the output registers in order to use accumulator.

PORT_ADDNSUB String No Specifies the usage of the addnsub input port. Values are: PORT_USED , PORT_UNUSED, and PORT_CONNECTIVITY (port usage is determined by checking the port connectivity.) If omitted the default value is PORT_CONNECTIVITY.
PORT_SIGNA String No Specifies the usage of the signa input port. Values are PORT_USED, PORT_UNUSED, and PORT_CONNECTIVITY. If omitted the default value is PORT_CONNECTIVITY.
PORT_SIGNB String No Specifies the usage of the signb input port. Values are PORT_USED, PORT_UNUSED, and PORT_CONNECTIVITY. If omitted the default value is PORT_CONNECTIVITY.
REPRESENTATION_[] String No Parameter [A,B]. Specifies the numerical representation of the corresponding data[] port. Values are UNSIGNED and SIGNED. When this parameter is set to SIGNED, the accumulator interprets the dataa input as signed two's complement. If omitted, the default value is UNSIGNED. This parameter is ignored if the signa port is used.
SIGN_ACLR_[] String No Parameter [A,B]. Specifies the asynchronous clear signal for the first register on the corresponding sign[] port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3. This parameter is ignored if the corresponding sign[] port is unused.
SIGN_PIPELINE_ACLR_[] String No Parameter [A,B]. Specifies the asynchronous clear signal for the second register on the corresponding sign[] port. Values are ACLR0, ACLR1, ACLR2, and ACLR3. If omitted the default value is ACLR3. This parameter is ignored if the corresponding sign[] port is unused.
SIGN_PIPELINE_REG_[] String No Parameter [A,B]. Specifies the clock signal for the second register on the corresponding sign[] port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the corresponding sign[] port is unused.
SIGN_REG_[] String No Parameter [A,B]. Specifies the clock signal for the first register on the corresponding sign[] port. Values are UNREGISTERED, CLOCK0, CLOCK1, CLOCK2, and CLOCK3. If omitted, the default value is CLOCK0. This parameter is ignored if the corresponding sign[] port is unused.
WIDTH_A Integer Yes Specifies the width of the dataa[] port.
WIDTH_B Integer Yes Specifies the width of the datab[] port.
WIDTH_RESULT Integer No Specifies the width of the result[] port.
Table 45.  ALTMULT_ACCUM Parameters (HardCopy Devices Only)
Parameter Name Type Required Description
DEDICATED_MULTIPLIER_CIRCUITRY String No Specifies whether to use dedicated multiplier circuitry. Values are AUTO, ON, and OFF. If omitted, the default value is AUTO.
Table 46.  ALTMULT_ACCUM Parameters (Stratix IV, Arria GX, and HardCopy Devices Only)
Parameter Name Type Required Description
MULTIPLIER_SATURATION String No Specifies multiplier saturation. Values are NO, YES, and VARIABLE. If omitted the default value is NO.

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