Manual Number: 40110-005-2
Page 33
LOCK#
Lock indicates an operation that may require multiple transactions to complete. When LOCK#
is asserted, nonexclusive transactions may proceed to an address that is not currently locked.
PAR
Parity is even parity across AD[31::00] and C/BE[3::0]#. Parity generation is required by all PCI
agents. The master drives PAR for address and write data phases; the target drives PAR for read
data phases.
PAR64 (optional)
Parity Upper DWORD is the even parity bit that protects AD[63::32] and C/BE[7::4]#. The
master drives PAR64 for address and write data phases; the target drives PAR64 for read data
phases.
PERR#
Parity Error is for the reporting of data parity errors during all PCI transactions except a Special
Cycle. There are no special conditions when a data parity error may be lost or when reporting
of an error may be delayed.
PRSNT1# and PRSNT2#
PRSNT1# and PRSNT2# are related to the connector only, not to other PCI components. They
are used for two purposes: indicating that a board is physically present in the slot and providing
information about the total power requirements of the board.
REQ#
Request indicates to the arbiter that this agent desires use of the bus. This is a point to point signal.
Every master has its own REQ#.
REQ64# (optional)
Request 64-bit Transfer, when actively driven by the current bus master, indicates it desires to
transfer data using 64 bits. REQ64# has the same timing as FRAME#. REQ64# has meaning
at the end of reset.
RST#
Reset is used to bring PCI-specific registers, sequencers and signals to a consistent state.
SBO# (optional)
Snoop Backoff is an optional cache support pin which indicates a hit to a modified line when
asserted. When SBO# is deserted and SDONE is asserted, it indicates a “clean” snoop result.
Содержание SB686P Series
Страница 2: ...Page ii...
Страница 14: ...Manual Number 40110 005 2 Page 4...
Страница 27: ...Manual Number 40110 005 2 Page 17 ISA Bus Pin Numbering...
Страница 37: ...Manual Number 40110 005 2 Page 27 PCI Local Bus Pin Numbering...
Страница 56: ...Manual Number 40110 005 2 Page 46 This page intentionally left blank...
Страница 80: ...Manual Number 40110 005 2 Page 70 This page intentionally left blank...
Страница 122: ......
Страница 124: ......
Страница 126: ......