Справочник Пользователя для Intel 1.50 GHz YA80543KC0216M
Модели
YA80543KC0216M
Datasheet
97
Signals Reference
A.1.22
DBSY_C2# (O)
DBSY# is a copy of the Data Bus Busy signal. This copy of the Data Bus Busy signal
(DBSY_C2#) is an output only.
(DBSY_C2#) is an output only.
A.1.23
DEFER# (I)
The DEFER# signal is asserted by an agent to indicate that the transaction cannot be guaranteed in-
order completion. Assertion of DEFER# is normally the responsibility of the priority agent.
order completion. Assertion of DEFER# is normally the responsibility of the priority agent.
A.1.24
DEN# (I/O)
The Defer Enable (DEN#) signal is driven on the bus on the second clock of the Request Phase on
the Ab[4]# pin. DEN# is asserted to indicate that the transaction can be deferred by the responding
agent.
the Ab[4]# pin. DEN# is asserted to indicate that the transaction can be deferred by the responding
agent.
A.1.25
DEP[15:0]# (I/O)
The Data Bus ECC Protection (DEP[15:0]#) signals provide optional ECC protection for Data Bus
(D[127:0]#). They are driven by the agent responsible for driving D[127:0]#. During power-on
configuration, bus agents can be enabled for either ECC checking or no checking.
(D[127:0]#). They are driven by the agent responsible for driving D[127:0]#. During power-on
configuration, bus agents can be enabled for either ECC checking or no checking.
The ECC error correcting code can detect and correct single-bit errors and detect double-bit or
nibble errors.
nibble errors.
A.1.26
DHIT# (I)
The Deferred Hit (DHIT#) signal is driven during the Deferred Phase by the deferring agent. For
read transactions on the bus DHIT# returns the final cache status that would have been indicated on
HIT# for a transaction which was not deferred. DID[9:0]# (I/O)
read transactions on the bus DHIT# returns the final cache status that would have been indicated on
HIT# for a transaction which was not deferred. DID[9:0]# (I/O)
DID[9:0]# are Deferred Identifier signals. The requesting agent transfers these signals by using
A[25:16]#. They are transferred on Ab[25:16]# during the second clock of the Request Phase on all
transactions, but Ab[20:16]# is only defined for deferrable transactions (DEN# asserted).
DID[9:0]# is also transferred on Aa[25:16]# during the first clock of the Request Phase for
Deferred Reply transactions.
A[25:16]#. They are transferred on Ab[25:16]# during the second clock of the Request Phase on all
transactions, but Ab[20:16]# is only defined for deferrable transactions (DEN# asserted).
DID[9:0]# is also transferred on Aa[25:16]# during the first clock of the Request Phase for
Deferred Reply transactions.
The Deferred Identifier defines the token supplied by the requesting agent. DID[9]# and DID[8:5]#
carry the agent identifiers of the requesting agents (always valid) and DID[4:0]# carry a transaction
identifier associated with the request (valid only with DEN# asserted). This configuration limits the
bus specification to 32 logical bus agents with each one of the bus agents capable of making up to
32 requests.
carry the agent identifiers of the requesting agents (always valid) and DID[4:0]# carry a transaction
identifier associated with the request (valid only with DEN# asserted). This configuration limits the
bus specification to 32 logical bus agents with each one of the bus agents capable of making up to
32 requests.
shows the DID encodings.
DID[9]# indicates the agent type. Symmetric agents use 0. Priority agents use 1. DID[8:5]#
indicates the agent ID. Symmetric agents use their arbitration ID. DID[4:0]# indicates the
transaction ID for an agent. The transaction ID must be unique for all deferrable transactions issued
by an agent which have not reported their snoop results.
indicates the agent ID. Symmetric agents use their arbitration ID. DID[4:0]# indicates the
transaction ID for an agent. The transaction ID must be unique for all deferrable transactions issued
by an agent which have not reported their snoop results.
Table A-7. DID[9:0]# Encoding
DID[9]#
DID[8:5]#
DID[4:0]#
Agent Type
Agent ID[3:0]
Transaction ID[4:0]