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| 型號： | BXM80526B500128 |
| 英文描述： | Microprocessor |
| 中文描述： | 微處理器 |
| 文件頁數(shù)： | 64/81頁 |
| 文件大?。?/td> | 598K |
| 代理商： | BXM80526B500128 |
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Mobile Intel
Celeron Processor (0.18μ) in BGA2 and Micro-PGA2 Packages
Datasheet
Order Number#249563-001
64
8.
Processor Interface
8.1
Alphabetical Signal Reference
A[35:3]# (I/O - GTL+)
The A[35:3]# (Address) signals define a 2
36
-byte physical memory address space. When ADS# is
active, these signals transmit the address of a transaction; when ADS# is inactive, these signals
transmit transaction information. These signals must be connected to the appropriate pins/balls of
both agents on the system bus. The A[35:24]# signals are protected with the AP1# parity signal,
and the A[23:3]# signals are protected with the AP0# parity signal.
On the active-to-inactive transition of RESET#, each processor bus agent samples A[35:3]#
signals to determine its power-on configuration. See Section 4 of this document and the
Pentium
II Processor Developer’s Manual
for details.
A20M# (I - 1.5V Tolerant)
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-Mbyte boundary. Assertion of A20M# is only supported in Real mode.
ADS# (I/O - GTL+)
The ADS# (Address Strobe) signal is asserted to indicate the validity of a transaction address on
the A[35:3]# signals. Both 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 be connected to the appropriate pins/balls on
both agents on the system bus.
AERR# (I/O - GTL+)
The AERR# (Address Parity Error) signal is observed and driven by both system bus agents, and
if used, must be connected to the appropriate pins/balls of both agents on the system bus. 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.
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