Mobile Intel Pentium 4 Processor with 533 MHz System Bus Specification Update

R
28 Specification Update
Z39.
A Timing Marginality in the Instruction Decoder Unit May Cause an
Unpredictable Application Behavior and/or System Hang
Problem: A timing marginality may exist in the clocking of the instruction decoder unit which leads to a circuit
slowdown in the read path from the Instruction Decode PLA circuit. This timing marginality may not be
visible for some period of time.
Implication: When this erratum occurs, an incorrect instruction stream may be executed resulting in an unpredictable
application behavior and/or system hang.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
Z40.
Missing Stop Grant Acknowledge Special Bus Cycle May Cause a System Hang
Problem: If a Stop Grant Acknowledge special bus cycle is deferred by the processor for a period of time long
enough for the chipset to de-assert and then re-assert STPCLK# signal, a processor supporting Hyper-
Threading Technology may fail to detect the de-assertion and re-assertion of STPCLK# signal. When
this occurs, the processor will not issue a Stop Grant Acknowledge special bus cycle in response to the
second STPCLK# assertion.
Implication: When this erratum occurs in an HT Technology enabled system, it may cause a system hang.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
Z41.
A Timing Marginality in the Arithmetic Logic Unit (ALU) May Cause
Indeterminate Behavior
Problem: A timing marginality may exist in the clocking of the ALU which leads to a slowdown in the speed of
the circuit’s operation. This could lead to incorrect behavior of the ALU.
Implication: When this erratum occurs, unpredictable application behavior and/or system hang may occur.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.