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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
17
Pin Name Type Pin
No.
Function
TENB Input J22 UTOPIA Transmit Multi-PHY Write Enable (TENB)
signal.
The TENB signal is an active low input which is
used along with the TADR[4:0] inputs to initiate
writes to the transmit FIFO’s.
TENB works as follows. When sampled high, no
write is performed, but the TADR[4:0] address is
latched to identify the transmit FIFO to be
accessed. When TENB is sampled low, the word on
the TDAT bus is written into the transmit FIFO that is
selected by the TADR[4:0] address bus. A complete
53 octet cell must be written to the transmit FIFO
before it is inserted into the transmit stream. Idle
cells are inserted when a complete cell is not
available. While TENB is deasserted, TADR[4:0] can
be used for polling TCA.
TENB is sampled on the rising edge of TFCLK.
TADR[4]
TADR[3]
TADR[2]
TADR[1]
TADR[0]
Input G21
H20
G22
H21
G23
UTOPIA Transmit Write Address (TADR[4:0])
signals.
The TADR[4:0] bus is used to select the FIFO (and
hence port) that is written to using the TENB signal
and the FIFO's whose cell available signal is visible
on the TCA polling output.
Note that address 0x1F is the null-PHY address and
cannot be assigned to any port on the S/UNI-QUAD.
TADR[4:0] is sampled on the rising edge of TFCLK.