AMD-K6-IIIE+550ACR AMD (ADVANCED MICRO DEVICES), AMD-K6-IIIE+550ACR Datasheet - Page 138
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AMD-K6-IIIE+550ACR
Manufacturer Part Number
AMD-K6-IIIE+550ACR
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.AMD-K6-IIIE550ACR.pdf
(370 pages)
Specifications of AMD-K6-IIIE+550ACR
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AMD-K6™-IIIE+ Embedded Processor Data Sheet
5.28
Pin Attribute
Summary
116
IGNNE# (Ignore Numeric Exception)
Input
IGNNE#, in conjunction with the numeric error (NE) bit in the
CR0 register, is used by the system logic to control the effect of
a n u n m a s ke d f l o a t i n g -p o i n t ex c e p t i o n o n a p rev i o u s
f l o a t i n g -p o i n t i n s t r u c t i o n d u r i n g t h e ex e c u t i o n o f a
f l oa t i n g -po i n t i n st r u c ti on , MMX i n st r u c t i on , 3D N ow !
instruction, or the WAIT instruction—hereafter referred to as
the target instruction.
If an unmasked floating-point exception is pending and the
target instruction is considered error-sensitive, then the
relationship between NE and IGNNE# is as follows:
If an unmasked floating-point exception is pending and the
target instruction is considered error-insensitive, then the
processor ignores the floating-point exception and continues
with the execution of the target instruction.
FERR # is not affected by the state of the NE bit or IGNNE #.
FERR # is always asserted at the instruction boundary of the
target instruction that follows the floating-point instruction
that caused the unmasked floating-point exception.
If NE = 0, then:
•
•
If NE = 1, the processor invokes the INT 10h exception
handler.
If IGNNE# is sampled asserted, the processor ignores the
floating-point
execution of the target instruction.
If IGNNE# is sampled negated, the processor waits until
it samples IGNNE#, INTR, SMI#, NMI, or INIT asserted.
•
•
If IGNNE# is sampled asserted while waiting, the
processor ignores the floating-point exception and
continues
instruction.
If INTR, SMI#, NMI, or INIT is sampled asserted
while waiting, the processor handles its assertion
appropriately.
Preliminary Information
Signal Descriptions
with
exception
the
execution
and
continues
23543A/0—September 2000
of
the
with
Chapter 5
target
the
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