Fujitsu MBA3073RC SERIES, Technical Manual

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1.5 Address frames
C141-C013 71
1.5.5.7 Breaking a connection
In addition to aborting a connection request, BREAK may also be used to break a
connection, in cases where CLOSE is not available. After transmitting BREAK,
the originating phy shall ignore all incoming dwords except for BREAKs.
After transmitting BREAK, the source phy shall initialize a Break Timeout timer
to 1 ms and start the Break Timeout timer. Table 1.29 lists the responses to a
BREAK being transmitted after a connection has been established.
Table 1.29 Break connection responses
Response Description
BREAK This confirms that the connection has been broken.
Break Timeout
timer expires The originating phy shall assume the connection has been
broken. The originating phy may perform a link reset
sequence.
In addition to a BREAK, a connection is considered broken due to loss of dword
synchronization.
The following shall be the responses by an SSP phy to a broken connection:
a) Received frames having no CRC error may be considered valid regardless of
whether an ACK has been transmitted in response to the frame prior to the
broken connection;
b) Transmitted frames for which an ACK has been received prior to a broken
connection shall be considered successfully transmitted; and
c) Transmitted frames for which an ACK or NAK has not been received prior to
a broken connection shall be considered not successfully transmitted.
1.5.5.8 Rate matching
In spite of the fact that the physical link is set to 3.0 Gbps, the connection rate
(indicated in an OPEN address frame) may be 1.5 Gbps. As shown in Table 1.30,
if the transfer rate of the physical link is higher than the connection rate, ALIGN
or NOTIFY primitives must be inserted between dwords for each phy of the
pathway.