參數(shù)資料
型號(hào)： EMBEDDED INTEL486 SX
廠商： Intel Corp.
英文描述： Embedded INTEL486 SX Processor(嵌入式INTEL486 SX處理器)
中文描述： 山西嵌入式英特爾486處理器（嵌入式英特爾486山西處理器）
文件頁(yè)數(shù)： 22/48頁(yè)
文件大小： 532K
代理商： EMBEDDED INTEL486 SX
Embedded Intel486 SX Processor
18
SRESET
I
Soft Reset
pin duplicates all functionality of the RESET pin except that the
SMBASE register retains its previous value. For soft resets, SRESET must remain
active for at least 15 CLK periods. SRESET is active HIGH. SRESET is
asynchronous but must meet setup and hold times t
20
and t
21
for recognition in any
specific clock.
System Management Interrupt
input invokes System Management Mode (SMM).
SMI# is a falling-edge triggered signal which forces the embedded Intel486 SX
processor into SMM at the completion of the current instruction. SMI# is
recognized on an instruction boundary and at each iteration for repeat string
instructions. SMI# does not break LOCKed bus cycles and cannot interrupt a
currently executing SMM. The embedded Intel486 SX processor latches the falling
edge of one pending SMI# signal while it is executing an existing SMI#. The nested
SMI# is not recognized until after the execution of a Resume (RSM) instruction.
System Management Interrupt Active
, an active LOW output, indicates that the
embedded Intel486 SX processor is operating in SMM. It is asserted when the
processor begins to execute the SMI# state save sequence and remains active
LOW until the processor executes the last state restore cycle out of SMRAM.
Stop Clock Request
input signal indicates a request was made to turn off or
change the CLK input frequency. When the embedded Intel486 SX processor
recognizes a STPCLK#, it stops execution on the next instruction boundary (unless
superseded by a higher priority interrupt), empties all internal pipelines and write
buffers, and generates a Stop Grant bus cycle. STPCLK# is active LOW. Though
STPCLK# has an internal pull-up resistor, an external 10-K
pull-up resistor is
needed if the STPCLK# pin is not used.
STPCLK# is an asynchronous signal,
but must remain active until the embedded Intel486 SX processor issues the
Stop Grant bus cycle. STPCLK# may be de-asserted at any time after the
processor has issued the Stop Grant bus cycle.
SMI#
I
SMIACT#
O
STPCLK#
I
BUS ARBITRATION
BREQ
O
Bus Request
signal indicates that the embedded Intel486 SX processor has
internally generated a bus request. BREQ is generated whether or not the
processor is driving the bus. BREQ is active HIGH and is never floated.
Bus Hold Request
allows another bus master complete control of the embedded
Intel486 SX processor bus. In response to HOLD going active, the processor floats
most of its output and input/output pins. HLDA is asserted after completing the
current bus cycle, burst cycle or sequence of locked cycles. The embedded
Intel486 SX processor remains in this state until HOLD is de-asserted. HOLD is
active HIGH and is not provided with an internal pull-down resistor. HOLD must
satisfy setup and hold times t
18
and t
19
for proper operation.
Hold Acknowledge
goes active in response to a hold request presented on the
HOLD pin. HLDA indicates that the embedded Intel486 SX processor has given
the bus to another local bus master. HLDA is driven active in the same clock that
the processor floats its bus. HLDA is driven inactive when leaving bus hold. HLDA
is active HIGH and remains driven during bus hold.
HOLD
I
HLDA
O
Table 7.
Embedded Intel486 SX Processor Pin Descriptions
(Sheet 4 of 6)
Symbol
Type
Name and Function
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