Intel FPGA Integer Arithmetic IP Cores User Guide

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

2.6. Parameters

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

Table 4.  LPM_COUNTER Parameters
Parameter Name Type Required Description
LPM_WIDTH Integer Yes Specifies the widths of the data[] and q[] ports, if they are used.
LPM_DIRECTION String No Values are UP, DOWN, and UNUSED. If the LPM_DIRECTION parameter is used, the updown port cannot be connected. When the updown port is not connected, the LPM_DIRECTION parameter default value is UP.
LPM_MODULUS Integer No The maximum count, plus one. Number of unique states in the counter's cycle. If the load value is larger than the LPM_MODULUS parameter, the behavior of the counter is not specified.
LPM_AVALUE Integer/String No Constant value that is loaded when aset is asserted high. If the value specified is larger than or equal to <modulus>, the behavior of the counter is an undefined (X) logic level, where <modulus> is LPM_MODULUS, if present, or 2 ^ LPM_WIDTH. Intel® recommends that you specify this value as a decimal number for AHDL designs.
LPM_SVALUE Integer/String No Constant value that is loaded on the rising edge of the clock port when the sset port is asserted high. Intel® recommends that you specify this value as a decimal number for AHDL designs.
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.
INTENDED_DEVICE_FAMILY String No This parameter is used for modeling and behavioral simulation purposes. This parameter is used for modeling and behavioral simulation purposes. The parameter editor calculates the value for this parameter.
CARRY_CNT_EN String No Intel® -specific parameter. You must use the LPM_HINT parameter to specify the CARRY_CNT_EN parameter in VHDL design files. Values are SMART, ON, OFF, and UNUSED. Enables the LPM_COUNTER function to propagate the cnt_en signal through the carry chain. In some cases, the CARRY_CNT_EN parameter setting might have a slight impact on the speed, so you might want to turn it off. The default value is SMART, which provides the best trade-off between size and speed.
LABWIDE_SCLR String No Intel® -specific parameter. You must use the LPM_HINT parameter to specify the LABWIDE_SCLR parameter in VHDL design files. Values are ON, OFF, or UNUSED. The default value is ON. Allows you to disable the use of the LAB-wide sclr feature found in obsoleted device families. Turning this option off increases the chances of fully using the partially filled LABs, and thus may allow higher logic density when SCLR does not apply to a complete LAB. This parameter is available for backward compatibility, and Intel® recommends you not to use this parameter.
LPM_PORT_UPDOWN String No Specifies the usage of the updown input port. If omitted the default value is PORT_CONNECTIVITY. When the port value is set to PORT_USED, the port is treated as used. When the port value is set to PORT_UNUSED, the port is treated as unused. When the port value is set to PORT_CONNECTIVITY, the port usage is determined by checking the port connectivity.

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