5-96
Bus Interface
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
5.2.37
NA (Next Address)
Input
Summary
The assertion of NA indicates that external memory is pre-
pared for a pipelined cycle.
Sampled
The processor samples NA from one clock after ADS until the
first expected BRDY of a bus cycle.
NA is sampled during memory cycles and writethroughs in the
normal operating modes (Real, Protected, and Virtual-8086)
and in SMM. NA is not sampled during writebacks, I/O cycles,
locked cycles, special bus cycles, or interrupt acknowledge
operations; or in the Shutdown, Halt, Stop Grant, or Stop Clock
states; or while BOFF, HLDA, RESET, INIT, or PRDY is
asserted. While AHOLD is asserted, NA is sampled only to
complete a bus cycle already begun before the assertion of
AHOLD.
Details
NA is an input that is asserted when external memory is pre-
pared to accept a pipelined cycle. The AMD-K5 processor
drives the pending ADS two clocks after NA is sampled active.
NA does not generate pipelined cycles when LOCK is asserted,
during writeback cycles, or when there are no pending internal
cycles. Furthermore, locked or writeback cycles are not pipe-
lined. KEN and WB/WT are sampled when NA or BRDY is
asserted, whichever comes first.
Refer to the appropriate data sheet for model-specific details
regarding the operation of NA.
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...