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| 型號(hào)： | BX80532KC2800D |
| 廠(chǎng)商： | INTEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 2800 MHz, MICROPROCESSOR |
| 文件頁(yè)數(shù)： | 113/129頁(yè) |
| 文件大小： | 1640K |
| 代理商： | BX80532KC2800D |
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Intel Xeon Processor with 512 KB L2 Cache
84
Datasheet
5.2
Signal Definitions
Table 41. Signal Definitions (Page 1 of 10)
Name
Type
Description
Notes
A[35:3]#
I/O
A[35:3]# (Address) define a 236 byte physical memory address space. In sub-phase
1 of the address phase, these pins transmit the address of a transaction. In sub-
phase 2, these pins transmit transaction type information. These signals must
connect the appropriate pins of all agents on the front side bus. A[35:3]# are
protected by parity signals AP[1:0]#. A[35:3]# are source synchronous signals and
are latched into the receiving buffers by ADSTB[1:0]#.
On the active-to-inactive transition of RESET#, the processors sample a subset of
the A[35:3]# pins to determine their power-on configuration. See Section 7.1.
4
A20M#
I
If A20M# (Address-20 Mask) 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.
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.
3
ADS#
I/O
ADS# (Address Strobe) 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 front side bus agents.
4
ADSTB[1:0]#
I/O
Address strobes are used to latch A[35:3]# and REQ[4:0]# on their rising and falling
edge.
4
AP[1:0]#
I/O
AP[1:0]# (Address Parity) are driven by the request initiator along with ADS#,
A[35:3]#, and the transaction type on the REQ[4:0]# pins. 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 front side bus agents.
The following table defines the coverage model of these signals.
4
BCLK[1:0]
I
The differential pair BCLK (Bus Clock) determines the bus frequency. All processor
front side bus agents must receive these signals to drive their outputs and latch
their inputs.
All external timing parameters are specified with respect to the rising edge of
BCLK0 crossing the falling edge of BCLK1.
4
Request Signals
Subphase 1
Subphase 2
A[35:24]#
AP0#
AP1#
A[23:3]#
AP1#
AP0#
REQ[4:0]#
AP1#
AP0#
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