RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
in the Bit Oriented Code Receiver Enable register. Unless fast declaration is
necessary, it is recommended that the AVC bit be set to logic 0 to improve bit
error tolerance. Valid BOC are indicated through the Receive Bit Oriented Code
Status register. The BOC bits are set to all ones (111111) if no valid code has
been detected. A maskable interrupt is generated to signal when a detected
code has been validated, or optionally, when a valid code goes away (i.e. the
BOC bits go to all ones).
When the receiver is out of cell delineation (OCD) and the Receive Bit Oriented
Code Status register will produce all ones (111111).
The valid codes are provided in Table 3. The Reserved codes anticipate future
enhanced feature set devices and should not be used. The User Defined codes
may be used without restriction. Regardless of definition, all 63 codes may be
validated and read by the microprocessor.
Note that processing of the metalic loopback activate code is handled as a
special case. The RXDn+/- data is looped back onto TXDn+/- at the end of the
reception of the loopback activate code rather than when the code is first
validated. For loopback to be initiated the loopback activate code must be first
validated (received 8 out of 10 times) and then invalidated, typical by reception of
another code. The loopback is not enable upon initial validation of the loopback
activate code because the looped back signal, which still contains the original
loopback activate command, would cause the far-end receiver to go into metallic
loopback as well, thereby forming an undesirable closed loop condition! The
loopback is cleared immediately upon the validation of the loopback deactivate
code, assuming the MLB register bit is logic 0.
To produce a loopback at the far end, program the Transmit Bit Oriented Code
register with the loopback activate code for at least 1 ms and then revert to an
another (typically idle) code. Upon termination of the loopback activate code, the
data transmitted on TXDn+/- is expected to be received verbatim on the RXDn+/-
inputs. When transmitting a loopback activate code, it is recommended the
RDIDIS register bit be set to logic 1, or else a loss-of-signal or loss-of-cell-
delineation event, would cause a premature loopback due to a pre-emptive
Remote Defect Indication (RDI) code being sent.
The remote reset activate and deactivate code words are supported by the
S/UNI-DUPLEX (PM7350) device. The S/UNI-VORTEX can send the reset
activate code to cause the S/UNI-DUPLEX device to assert its active low RSTOB
output. The deactivate code causes deassertion of RSTOB. See the S/UNI-
DUPLEX datasheet for details.
The Remote Defect Indication (RDI) is sent whenever Loss of Signal (LOS) or
Loss of Cell Delineation (LCD) is declared. This code word takes precedence
over all others.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
40
PMC [ PMC-SIERRA, INC ]
