CS5920 datasheet(102/160 Pages) AMCC

102 / 160 page

S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

102

Data Book

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

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.

Table 53. Target Termination Type

Termination

DEVSEL#

STOP#

TRDY#

Comment

Disconnect

Data is transferred. Transaction needs to be re-initiated to complete.

Retry

off

Data was not transferred. Transaction should be tried later.

Abort

off

Data was not transferred. Fatal error.

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