This block is listed in the following Xilinx® Blockset libraries: AXI4, DSP, Math, and Index.
The Xilinx Divider Generator block creates a circuit for integer division based on Radix-2 non-restoring division, or High-Radix division with prescaling.
Block Parameters
The Block Parameters dialog box can be invoked by double-clicking the icon in your Simulink® model.
- Basic tab
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- Common Options
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- Algorithm Type
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- Radix-2 non-restoring integer division using integer operands, allows a remainder to be generated. This is recommended for operand widths less than around 16 bits. This option supports both unsigned and signed (2’s complement) divisor and dividend inputs.
- High_Radix division with prescaling. This is recommended for operand widths greater than 16 bits, though the implementation requires the use of DSP48 (or variant) primitives. This option only supports signed (2’s complement) divisor and dividend inputs.
-
LutMultA simple lookup estimate of
the reciprocal of the divisor followed by a
multiplier. Only the remainder output type is
supported because of the bias required in the
reciprocal estimate. This bias would introduce an
offset (error) if used to create a fractional
output. This is recommened for operand widths less
than or equal to 12 bits. This implementation uses
DSP slices, block RAM, and a small number of FPGA
logic primitives (registers and LUTs). For operand
widths where either Radix2 or the LUTMult options
are possible, the LUTMult offers a solution using
fewer FPGA logic resources because of the use of
DSP and block RAM primitives. Supports
unsignedor two's complementsignednumbers.
- Output channel
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- Remainder type
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- Remainder
- Only supported for Radix 2.
- Fractional
- Determines the number of bits in the fractional port output.
- Fractional width
- If Fractional Remainder type is selected, this entry determines the number of bits in the fractional port output.
- Radix2 Options
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- Radix2 throughput
- Determines the interval in clocks between new data being input (and output). Choices are 1, 2, 4, and 8.
- High Radix Options
-
- Detect divide by zero
- Determines if the core shall have a division-by-zero indication output port.
- AXI Interface
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- AXI behavior
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- NonBlocking
- Preforms an action only when a control packet and a data packet are presented to the block at the same time.
- Blocking
- Preforms an action when a data packet is presented to the block. The block uses the previous control information.
- AXI Implementation emphasis
-
- Resources
- Automatic (fully pipelined) or Manual (determined by following field).
- Performance
- Implementation decisions target the highest speed.
- Latency Options
-
- Latency configuration
- Automatic (fully pipelined) or Manual (determined by following field).
- Latency
- This field determines the exact latency from input to output in terms of clock enabled clock cycles.
- Optional ports tab
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- Optional Ports
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- Divided Channel Ports
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- Has TUSER
- Adds a tuser input port to the dividend channel.
- Has TLAST
- Adds a tlast output port to the dividend channel.
- Divisor Channel Ports
-
- Has TUSER
- Adds a tuser input port to the divisor channel.
- Has TLAST
- Adds a tlast output port to the divisor channel.
- ACLKEN
- Specifies that the block has a clock enable port (the equivalent of selecting the Has ACLKEN option in the CORE Generator GUI).
- ARESETn
- Specifies that the block has a reset port. Active-Low synchronous clear. A minimum ARESETn pulse of two cycles is required.
- m_axis_dout_tready
- Specifies that the block has a dout_tready output port.
- Input TLAST combination for output
- Determines the behavior of the dout_tlast output port.
- Null
- Output is null.
- Pass_Dividend_TLAST
- Pass the value of the dividend_tlast input port to the dout_tlast output port.
- Pass Divisor_TLAST
- Pass the value of the divisor_tlast input port to the dout_tlast output port.
- OR_all_TLASTS
- Pass the logical OR of all the present TLAST input ports.
- AND_all_TLASTS
- Pass the logical AND of all the present TLAST input ports.
Other parameters used by this block are explained in the topic Common Options in Block Parameter Dialog Boxes.