6-27

BUS INTERFACE UNIT
Figure 6-10. Halt Cycle
A2492-02
LOCK#
D15:0
CLK2
BHE#, A1, M/IO#, W/R#
RD#
READY#
T1 T2 T1 T2 Ti Ti Ti Ti
Cycle 1
Nonpipelined
(Write)
[Late Ready]
CLKOUT
Cycle 2
Nonpipelined
(Halt)
ADS#
NA#
A25:2, BLE#, D/C#
WR#
LBA#
Idle
Float
Valid 1
CPU remains halted until INTR, SMI#,
NMI, or RESET is asserted.
CPU responds to HOLD input
while in the HALT state.

HALT cycle must be acknowledged by READY# asserted. This READY# could be

generated internally or externally.

Valid 2

†

†

Out Undefined
Valid 1
Valid 1