PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
Pin Name
Type
Pin
No.
Function
TSOC
Input
L21
The UTOPIA transmit start of cell (TSOC) signal marks the start
of a cell structure on the TDAT bus.
In 16-bit Level 2 ATM mode, the first word of the cell structure is
present on the TDAT[15:0] bus when TSOC is high. It is not
necessary for TSOC to be present for each cell.
In 8-bit Level 3 ATM mode, the first byte of the cell structure is
present on the TDAT[7:0] bus when TSOC is high. TSOC must
be present for each cell.
TSOC is considered valid only when TENB is simultaneously
asserted. TSOC is sampled on the rising edge of TFCLK.
TENB
Input
L22
The UTOPIA transmit write enable (TENB) signal is an active
low input which is used to initiate writes to the transmit FIFO’s.
When TENB is sampled high, the information sampled on the
TDAT, TPRTY and TSOC signals are invalid. When TENB is
sampled low, the information sampled on the TDAT, TPRTY and
TSOC signals are valid and are written into the transmit FIFO.
TENB is sampled on the rising edge of TFCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
25
PMC [ PMC-SIERRA, INC ]
