PMC-Sierra, Inc.
S
TANDARD
P
RODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994
SAPI DAUGHTERBOARD
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FUNCTIONAL DESCRIPTION
Block Diagram
UTOPIA Edge Connector Interface
Rx
FIFO
Dropside FIFO interface
tx line
bit serial
TXCI+
TXCI-
TXD+
TXD-
POCLK
LOS Generate
CLK
PAL
SUNI
RSER
PICLK
O
I/O
O
PIN[7:0]
TClk+
TClk-
TSer+
TSer-
GPIN
/LFI
RClk+
RClk-
I
SD
UTOPIA
Interface
Optics
Tout+
Tout-
TXD+/-
/Loop
Tx+
Tx-
Rx+
Rx-
RXD+/-
rx line
bit serial
RXC+
RXC-
Rin+
ID ROM
CY7B951
RXD+
RXD-
RSer+
Rser-
RefClk+
RefClk-
Rin-
19.44 MHz
Osc
SUNI
The SUNI is a monolithic integrated circuit that implements the SONET/SDH
processing and ATM mapping functions of a 155 Mbit/s SONET STS-3c User
Network Interface. It is the heart of the SAPI board; all traffic goes through the SUNI.
On the line side, the SUNI transmits SONET frames through the line interface and
receives frames from the line interface. On the drop side, the SUNI sinks cells
provided by the buffer interface and sources cells to the buffer interface. Below, the
SUNI is briefly described.
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2
PMC [ PMC-SIERRA, INC ]
