5-126
Bus Interface
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
processor is in the Stop Clock state, however, CLK must be
restarted before any other signals are changed.
STPCLK is the lowest-priority interrupt, as shown in Table 5-3
on page 5-16. R/S is the only interrupt or exception that is
acted upon while STPCLK is asserted, but R/S is only acted
upon in the Stop Grant state, not the Stop Clock state. Edge-
triggered interrupts (FLUSH, SMI, INIT, NMI) are not latched
in the Stop Clock state; however, they are latched in the Stop
Grant state and are recognized after STPCLK is negated.
The AMD-K5 and Pentium processors differ in their support
for STPCLK in the following ways:
■
In the Halt state, the AMD-K5 processor responds to STP-
CLK by entering the Stop Grant state. The Pentium proces-
sor ignores STPCLK in the Halt state.
■
The Pentium processor guarantees that at least one instruc-
tion will be executed between the negation of STPCLK and
a subsequent reassertion of STPCLK. The AMD-K5 proces-
sor does not guarantee this.
■
In the Halt or Stop Grant states, the AMD-K5 processor can-
not enter a low-power state if it does not have the bus (that
is, if AHOLD, BOFF or HLDA is asserted). The same may
not be true of the Pentium processor.
For further details on clock control and power management,
see Section 6.4 on page 6-33 and Section 6.6 on page 6-40.
Summary of Contents for AMD-K5
Page 1: ...AMD K5 Processor Technical Reference Manual TM...
Page 10: ...x AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 24: ...1 4 Overview AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 54: ...2 30 Internal Architecture AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 116: ...4 26 Performance AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 356: ...6 44 System Design AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 380: ...7 24 Test and Debug AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 396: ...A 16 AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 406: ...I 10 Index AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...