參數(shù)資料
型號: intel386 DX
廠商: Intel Corp.
英文描述: 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲管理)
中文描述: 32位CHMOS微處理器集成內(nèi)存管理(32位CHMOS微處理器帶集成存儲管理)
文件頁數(shù): 88/139頁
文件大小: 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
231630–27
Figure 5-23. Halt Indication Cycle
The LOCK
Y
output is asserted from the beginning
of the first interrupt acknowledge cycle until the end
of the second interrupt acknowledge cycle. Four idle
bus states, Ti, are inserted by the Intel386 DX be-
tween the two interrupt acknowledge cycles, allow-
ing for compatibility with spec TRHRL of the 8259A
Interrupt Controller.
During both interrupt acknowledge cycles, D0–D31
float. No data is read at the end of the first interrupt
acknowledge cycle. At the end of the second inter-
rupt acknowledge cycle, the Intel386 DX will read an
external interrupt vector from D0–D7 of the data
bus. The vector indicates the specific interrupt num-
ber (from 0–255) requiring service.
5.4.5 Halt Indication Cycle
The Intel386 DX halts as a result of executing a
HALT instruction. Signaling its entrance into the halt
state, a halt indication cycle is performed. The halt
indication cycle is identified by the state of the bus
definition signals shown in
5.2.5 Bus Cycle Defini-
tion
and a byte address of 2. BE0
Y
and BE2
Y
are
the only signals distinguishing halt indication from
shutdown indication, which drives an address of 0.
During the halt cycle undefined data is driven on
D0–D31. The halt indication cycle must be acknowl-
edged by READY
Y
asserted.
A halted Intel386 DX resumes execution when INTR
(if interrupts are enabled) or NMI or RESET is as-
serted.
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