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
31
Pin Name
Type
Pin
No.
Function
When using the receive serial interface, RC1FP is set
high for one SYSCLK cycle once every multi-frame (4
frames for SBI without CAS, 48 frames for SBI with
CAS, and 4 frames for Telecom Bus), or multiple
thereof. The RC1FP_DLY[13:0] bits (register 007H) are
used to align the C1 frame boundary 8B/10B character
on the receive serial interface (RPWRK/RNWRK and
RPPROT/RNPROT) with RC1FP.
Using the Receive Parallel Interface:
In SBI 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. The frame pulse does not
need to be repeated every 2KHz as the SBS will
flywheel in its absence.
When using the SBI bus in synchronous mode the
RC1FP signal can be used to indicate T1 and E1 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 must be
locked to an offset of either 0 or 522. The byte
following J1 is used to indicate multi-frame alignment
and should only pulse once every 4 frames marking the
frame with the V1s.
RC1FP is sampled on the rising edge of SYSCLK.
Receive SBI336 Interface (14 Signals)
RDATA[7]
RDATA[6]
RDATA[5]
RDATA[4]
RDATA[3]
RDATA[2]
RDATA[1]
RDATA[0]
Input
B9
C10
D11
B10
C11
A10
B11
D12
Receive Data (RDATA[7:0]).
This is the receive
SBI336 data bus when configured for SBI336 byte wide
interface instead of the Serial SBI336S interface. When
in telecom bus mode this is the data bus for 77.76MHz
telecom bus. The receive data bus is a time division
multiplexed bus which transports tributaries by
assigning them to fixed octets within the SBI or
Telecom Bus structure.
In SBI336 mode, multiple devices can drive this bus at
uniquely assigned tributary columns within the SBI336
bus structure.
RDATA[7:0] is sampled on the rising edge of SYSCLK.
RDATA[7:0] have integral pull-up resistors.
RDP
Input
A8
Receive Data Parity (RDP).
This is the receive data
bus parity when configured for the Receive byte wide
interface. This signal carries the even or odd parity for
the receive bus signals. In SBI336 mode, the parity
calculation encompasses the RDATA[7:0], RPL and
RV5 signals. In Telecom Bus mode, the parity
calculation encompasses the RDATA[7:0] and
optionally the RC1FP and RPL signals.
Multiple devices can drive this signal at uniquely
assigned tributary columns within the fixed structure.