Intel® Agilex™ Variable Precision DSP Blocks User Guide

ID 683037
Date 11/17/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

10.4.4. FP32 Multiplication with Accumulation Mode Signals

Figure 75. FP32 Multiplication with Addition or Subtraction Mode Signals
Table 119.   Data Input and Output Signals
Signal Name Type Width Default Description
fp32_mult_a[31:0] Input 32 Low Input data bus to the multiplier.
fp32_mult_b[31:0] Input 32 Low Input data bus to the multiplier.
fp32_result[31:0] Output 32 Output data bus from IP core.
fp32_chainout[31:0] Output 32 Connect these signals to the chainin signals of the next floating-point DSP IP core.
Table 120.   Dynamic Control Signal
Signal Name Type Width Default Description
accumulate Input 1 Low Input signal to enable or disable the accumulator feature. You can change the value of this signal during run-time.
  • 1: Enable feedback the adder's output.
  • 0: Disable the feedback mechanism.
Table 121.  Clock, Enable, and Clear Signals
Signal Name Type Width Default Description
clk[0] Input 1 Input clock for all registers.
ena[2:0] Input 3 Clock enable signals for all registers.

These signals are active-High.

clr[1:0] Input 2 Low These signals can be asynchronous or synchronous clear input signals for all registers. You may select the type of clear input signal using Type of clear signal parameter.

These signals are active-High.

For more information about clock enable restrictions for input registers, refer to the related information.

Table 122.  Exception Flag Signals
Signal Name Type Width Default Description
fp32_mult_overflow Output 1

This signal indicates if the FP32 multiplier result is a larger value compared to the maximum presentable value.

1: If the multiplier result is a larger value compared to the maximum representable value and the result is cast to infinity.

0: If the multiplier result is not larger than the maximum presentable value.

fp32_mult_underflow Output 1

This signal indicates if the FP32 multiplier result is a smaller value compared to the minimum presentable value.

1: If the multiplier result is a smaller value compared to the minimum representable value and the result is flushed to zero.

0: If the multiplier result is a larger than the minimum representable value.

fp32_mult_inexact Output 1

This signal indicates if the FP32 multiplier result is an exact representation.

1: If the multiplier result is:
  • a rounded value or
  • a smaller value compared to the minimum representable value or
  • a larger value compared to the maximum representable value.

0: If the multiplier result does not meet any of the criteria above.

fp32_mult_invalid Output 1

This signal indicates if the FP32 multiplier operation is ill-defined and produces an invalid result.

1: If the multiplier result is invalid and cast to qNaN.

0: If the multiplier result is not an invalid number.

fp32_adder_overflow Output 1

This signal indicates if the adder result is a larger value compared to the maximum representable value.

1: If the adder result is a larger value compared to the maximum presentable value and the result is cast to infinity.

0: If the multiplier result is not larger than the maximum presentable value.

fp32_adder_underflow Output 1

This signal indicates if the adder result is a smaller value compared to the minimum presentable value.

1: If the multiplier result is a smaller value compared to the minimum representable value and the result is flushed to zero.

0: If the multiplier result is a larger than the minimum representable value.

fp32_adder_inexact Output 1

This signal indicates if the adder result is an exact representation.

1: If the adder result is:
  • a rounded value
  • a smaller value compared to the minimum representable value or
  • a larger value compared to the maximum representable value.

0: If the multiplier result does not meet any of the criteria above.

fp32_adder_invalid Output 1

This signal indicates if the adder operation is ill-defined and produces an invalid result.

1: If the multiplier result is invalid and cast to qNaN.

0: If the multiplier result is not an invalid number.