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| 型號： | pentium III |
| 廠商： | Intel Corp. |
| 英文描述： | pentium III Processor for the PGA370 Socket at 500MHz to 933MHz(工作頻率500到933兆赫茲活動(dòng)帶PGA370插孔奔III處理器) |
| 中文描述： | 奔騰III處理器在500MHz到933MHz的（工作頻率500到933兆赫茲活動(dòng)帶PGA370插孔奔三處理器的PGA370插座） |
| 文件頁數(shù)： | 68/78頁 |
| 文件大?。?/td> | 610K |
| 代理商： | PENTIUM III |
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68
Datasheet
Pentium
III Processor for the PGA370 Socket at 500 MHz to 933 MHz
7.0
Processor Signal Description
This section provides an alphabetical listing of all the Intel
Pentium
III
processor signals. The
tables at the end of this section summarize the signals by direction: output, input, and I/O.
7.1
Alphabetical Signals Reference
Table 33. Signal Description (Sheet 1 of 8)
Name
Type
Description
A[35:3]#
I/O
The A[35:3]# (Address) signals define a 2
36
-byte physical memory address space.
When ADS# is active, these pins transmit the address of a transaction; when ADS#
is inactive, these pins transmit transaction type information. These signals must
connect the appropriate pins of all agents on the processor system bus. The
A[35:24]# signals are parity-protected by the AP1# parity signal, and the A[23:3]#
signals are parity-protected by the AP0# parity signal.
On the active-to-inactive transition of RESET#, the processors sample the A[35:3]#
pins to determine their power-on configuration. See the Intel
Pentium
II Processor
Developer’s Manualfor details.
A20M#
I
If the A20M# (Address-20 Mask) input signal is asserted, the processor masks
physical address bit 20 (A20#) before looking up a line in any internal cache and
before driving a read/write transaction on the bus. Asserting A20M# emulates the
8086 processor's address wrap-around at the 1 MB boundary. Assertion of A20M# is
only supported in real mode.
A20M# is an asynchronous signal. However, to ensure recognition of this signal
following an I/O write instruction, it must be valid along with the TRDY# assertion of
the corresponding I/O Write bus transaction.
ADS#
I/O
The ADS# (Address Strobe) signal is asserted to indicate the validity of the
transaction address on the A[35:3]# pins. All bus agents observe the ADS#
activation to begin parity checking, protocol checking, address decode, internal
snoop, or deferred reply ID match operations associated with the new transaction.
This signal must connect the appropriate pins on all processor system bus agents.
AERR#
I/O
The AERR# (Address Parity Error) signal is observed and driven by all processor
system bus agents, and if used, must connect the appropriate pins on all processor
system bus agents. AERR# observation is optionally enabled during power-on
configuration; if enabled, a valid assertion of AERR# aborts the current transaction.
If AERR# observation is disabled during power-on configuration, a central agent
may handle an assertion of AERR# as appropriate to the error handling architecture
of the system.
AP[1:0]#
I/O
The AP[1:0]# (Address Parity) signals are driven by the request initiator along with
ADS#, A[35:3]#, REQ[4:0]#, and RP#. AP1# covers A[35:24]#, and AP0# covers
A[23:3]#. A correct parity signal is high if an even number of covered signals are low
and low if an odd number of covered signals are low. This allows parity to be high
when all the covered signals are high. AP[1:0]# should connect the appropriate pins
of all processor system bus agents.
BCLK
I
The BCLK (Bus Clock) signal determines the bus frequency. All processor system
bus agents must receive this signal to drive their outputs and latch their inputs on the
BCLK rising edge.
All external timing parameters are specified with respect to the BCLK signal.
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