s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 107
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s5920
Manufacturer Part Number
s5920
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5920.pdf
(165 pages)
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S5920 – PCI Product: PCI Bus Protocol
Table 53. Target Termination Type
Targets selected with LOCK# deasserted during the
assertion of FRAME# (clock period 1 of Figure 6),
which encounter the assertion of LOCK# during the
following clock (clock period 2 of Figure 6) are thereaf-
ter considered “locked.” A target, once locked,
requires that subsequent accesses to it deassert
LOCK# while FRAME# is asserted. Figure 7 shows a
subsequent access to a locked target by the master
which locked it. Because LOCK# is owned by a single
master, only that master is able to deassert it at the
beginning of a transaction (assuming successful
access to the locked target). A locked target can only
be unlocked during the clock period following the last
107
Termination
Disconnect
Retry
Abort
DS1596
DEVSEL#
on
on
off
STOP#
on
on
on
TRDY#
on
off
off
Data is transferred. Transaction needs to be re-initiated to complete.
Data was not transferred. Transaction should be tried later.
Data was not transferred. Fatal error.
data transfer of a transaction when the LOCK# signal
is deasserted.
An unlocked target ignores LOCK# when it observes
that LOCK# is already asserted during the first clock
period of a transaction. This allows other masters to
access other (unlocked) targets. If an access to a
locked target is attempted by a master other than the
one that locked it, the target responds with a retry
request, as shown in Figure 8.
The S5920 responds to and supports bus masters
which lock it as a target.
Comment
Revision 1.02 – April 12, 2007
AMCC Confidential and Proprietary
Data Book
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