S5920Q Applied Micro Circuits Corporation, S5920Q Datasheet - Page 107
S5920Q
Manufacturer Part Number
S5920Q
Description
Manufacturer
Applied Micro Circuits Corporation
Datasheet
1.S5920Q.pdf
(165 pages)
Specifications of S5920Q
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Operating Temperature (max)
70C
Package Type
PQFP
Rad Hardened
No
Lead Free Status / Rohs Status
Not Compliant
Available stocks
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S5920Q
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AMCC
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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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