SBI Bus Serializer ASSP Telecom Standard Product Data Sheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000168, Issue 5
43
Pin Name
Type
Pin
No.
Function
character bit ‘a(chǎn)’ is transmitted first and the bit ‘j’ is
transmitted last.
TPWRK/TNWRK are nominally 777.6 Mbps data
streams.
TPPROT
TNPROT
Analog
LVDS
Output
H25
H26
Transmit Protect Serial Data.
In SBI336 mode, the
differential transmit protect serial data link
(TPPROT/TNPROT) carries a transmit 77.76Mhz
SBI336 data stream to a downstream protect sink, in bit
serial format, SBI336S.
In Telecom bus mode, TPPROT/TNPROT carries the
transmit 77.76MHz Telecom bus data stream to a
downstream protection sink, in bit serial format.
Data on TPPROT/TNPROT is encoded in an 8B/10B
format extended from IEEE Std. 802.3. The 8B/10B
character bit ‘a(chǎn)’ is transmitted first and the bit ‘j’ is
transmitted last.
TPPROT/TNPROT are nominally 777.6 Mbps data
streams.
Transmit SBI336 Interface (15 Signals)
TC1FP
Output
A24
Transmit Serial SBI Frame Pulse.
The transmit serial
SBI frame pulse signal (TC1FP) provides system timing
of the transmit serial interface. When using the transmit
parallel interface, this signal indicated the first C1 octet
on the transmit SBI336 or Telecom bus.
Using the Transmit Serial Interface:
TC1FP is set high to indicate that the C1 frame
boundary 8B/10B character has been serialized out on
the transmit working serial data link (TPWRK/TNWRK)
and the transmit protection serial data link (TPPROT/
TNPROT). TC1FP is output every 4 frame for SBI
mode without CAS and for Telecom bus mode. TC1FP
is output every 48 frames for SBI mode with CAS.
Using the Transmit Parallel Interface:
In SBI/SBI336 mode, this signal also indicates multi-
frame alignment which occurs every 4 frames, therefore
this signal is pulsed every fourth C1 octet to produce a
2KHz multi-frame signal.
When using the SBI bus in synchronous mode the
TC1FP signal indicates T1 and E1 signaling multi-frame
alignment by pulsing on 48 SBI frame boundaries. This
must be done if CAS is to be switched along with the
data.
In Telecom bus mode, this signal may also be pulsed to
indicate the J1 byte position and the byte following J1.
For locked STS/AUs, the J1 byte position is locked to
an offset of either 0 or 522. The byte following J1 is
used to indicate multi-frame alignment and is only
pulsed once every 4 frames marking the frame with the
V1s.
TC1FP is updated on the rising edge of SYSCLK.
TDATA[7]
Output
A21
Transmit Data (TDATA[7:0]).
This is the transmit data