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Land Listing and Signal Descriptions

Datasheet

4.2

Alphabetical Signals Reference

Table 25.

Signal Description ( (Sheet 1 of 9))

Name

Type

Description

A[35:3]#

Input/

Output

A[35:3]# (Address) define a 236-byte physical memory address

space. In sub-phase 1 of the address phase, these signals transmit

the address of a transaction. In sub-phase 2, these signals transmit

transaction type information. These signals must connect the

appropriate pins/lands of all agents on the processor FSB. 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 processor

samples a subset of the A[35:3]# signals to determine power-on

configuration. See Section 6.1 for more details.

A20M#

Input

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-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 Input/Output write instruction, it must be

valid along with the TRDY# assertion of the corresponding Input/

Output Write bus transaction.

ADS#

Input/

Output

ADS# (Address Strobe) is asserted to indicate the validity of the

transaction address on the A[35:3]# and REQ[4:0]# signals. All bus

agents observe the ADS# activation to begin protocol checking,

address decode, internal snoop, or deferred reply ID match

operations associated with the new transaction.

ADSTB[1:0]#

Input/

Output

Address strobes are used to latch A[35:3]# and REQ[4:0]# on their

rising and falling edges. Strobes are associated with signals as

shown below.

BCLK[1:0]

Input

The differential pair BCLK (Bus Clock) determines the FSB

frequency. All processor FSB 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 VCROSS.

BNR#

Input/

Output

BNR# (Block Next Request) is used to assert a bus stall by any bus

agent unable to accept new bus transactions. During a bus stall, the

current bus owner cannot issue any new transactions.

Signals

Associated Strobe

REQ[4:0]#, A[16:3]#

ADSTB0#

A[35:17]#

ADSTB1#

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