mk50h27 STMicroelectronics, mk50h27 Datasheet - Page 18

• Manufacturer Part Number: mk50h27
• Description: Signalling System 7 Link Controller
• Manufacturer: STMicroelectronics

MK50H27
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to continuouslytransmit SIOS signal units.
Valid only in the Power Off mode.
operation. Data frames are transmitted and received out of the de-
scriptor rings but no protocol processing is done. Address and
Control fields are not prepended to the frames, but CK processing
works normally. HDLC Transparent Mode may be exited only with a
Power Off primitive or by a bus RESET. Valid only in the Power Off
phase.
into the STATUS BUFFER. Valid in all states, but only after
the Init primitive has been previously issued.
internal self test. Valid only in the Power Off phase. See section 4.4.8
for the self test procedure.
Out of Service phase and to continuously transmit SIOS signal units.
Valid in all phases except the Power Off and Out of Service phase.
should only be issued when in the Out of Service phase, after the in-
itialization block has been read.
3 or higher levels cannot accept signalling messages. All subsequent
MSU’s are ignored by the MK50H27 & SIPO signal units are transmit-
ted.
condition. The MK50H27 may resume transmitting FISUs and MSUs.
for initial alignment.
used for initial alignment (this is the default proving period).
including the last transmitted Backward Sequence Number (BSNT).
When completed, PPRIM 18 will be issued.
written to the Status Buffer and requests the MK50H27 to update the
retransmission buffer. The MK50H27 should then place the up-
dated retransmission index into the Status Buffer.
SIB signal units at T5 timer interval. It is recommended that the DRX
bit in CSR0 also be set when issuing this primitive so that MSUs can-
not be received during congestion.
Congestion state caused by UPRIM 14. If DRX is set, it should be
cleared just prior to issuing this primitive. If congestion state was en-
tered due to a MISSed signal unit then the congestion state should be
cleared by clearing MISS.
sending of SIOS signal units, stopped by issuance of UPRIM 17. Valid
only in Out Of Service phase when JSS7E=1 (CSR2).
transmission of SIOS signal units while the MK50H27 is in the Out of
Service phase. TTC specification JT-Q703 requires that transmission
of SIOS stop some period of time after going Out Of Service; this primi-
tive provides the mechanism for meeting that requiremnt. Transmis-
Init: instructs the MK50H27 to read the initialization block from memory.
Trans: instructs the MK50H27 to enter the HDLC Transparent phase of
Status Request: instructs the MK50H27 to write the current link status
Self-Test Request: instructs the MK50H27 to perform the built in
Stop: forces all DMA activity to cease. Causes the MK50H27 to enter the
Start: initial alignment begins and the descriptor rings are reset. Start
Local Processor Outage: issued to the MK50H27 to indicate that level
Local Processor Recovered: indicates end of Local Processor Outage
Emergency: indicates that the emergency proving period is to be used
Emergency Ceases: Indicates that the normal proving period is to be
Retrieve BSNT: causes the entire STATUS BUFFER to be updated
Retrieval request and FSNC: indicates that the FSNC has been
Congestion: causes the MK50H27 to enter a congestion state and send
Clear Congestion: This primitive should be used only to clear the
Start Sending SIOS: If JSS7E=1, this primitive can be used to resume
Stop Sending SIOS: If JSS7E=1, this primitive can be used to stop the