Altera Floating-Point Bedienungsanleitung PDF herunterladen (Seite 45)

Port Name Required Description

xo Yes The overflow flag for port x. The signal goes high when the exponent of

the input x is larger than maxMSBX. The signal remains high for the

entire data set. This flag invalidates port r. You should consider

increasing maxMSBX. This flag also indicate infinity and NaN.

xu Yes The underflow flag for port x. The signal goes high when the exponent

of the input x is smaller than LSBA. The signal remains high for the

entire data set. This flag does not invalidate port r. You should consider

lowering LSBA.

ao Yes The overflow flag for Accumulator. The signal goes high when the

exponent of the accumulated value is larger than MSBA. The signal

remains high for the entire data set. This flag invalidates port r. You

should consider increasing MSBA.

ALTERA_FP_ACC_CUSTOM Parameters

Table 4-4: ALTERA_FP_ACC_CUSTOM Parameters

Category Parameter Values Description

Input Data

Floating point

format

single,

double

Choose the floating point format of the input

data values. The output data values of the

accumulator is in the same format.

The default is single.

maxMSBX — The maximum weight of the MSB of an input.

For example, when adding probabilities in the 0

to 1 range set this weight to ceil(log

(1))=0. The

xo output signal goes high when the MSB of an

input value has a weight larger than maxMSBX.

The result of the accumulation is then invalid. If

you are unsure about the range of the inputs,

then set the maxMSBX parameter to MSBA, at

the possible expense of increased resource

usage.

The default value is 12.

4-4

ALTERA_FP_ACC_CUSTOM Parameters

UG-01058

2014.12.19

Altera Corporation

ALTERA_FP_ACC_CUSTOM IP Core

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