PM5356 Datasheet, PDF (36/307 Pages) PMC-Sierra, Inc – 622 Mbit/s ATM Physical Layer Device

RELEASED
S/UNI-622-MAX
DATASHEET
PMC-1980589
ISSUE 6
PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
SATURN USER NETWORK INTERFACE (622-MAX)
Pin Name
TSOC
TPRTY
TENB
Type
Input
Input
Input
Pin
No.
L21
L20
L22
Function
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.
The UTOPIA transmit bus parity (TPRTY) signal
indicates the parity on the TDAT bus. A parity error is
indicated by a status bit and a maskable interrupt.
Cells with parity errors are inserted in the transmit
stream, so the TPRTY input may be unused.
In 16-bit Level 2 ATM mode, the TPRTY signal
indicates the parity on the TDAT[15:0] bus. Odd or
even parity selection is made in the TXCP registers.
In 8-bit Level 3 ATM mode, the TPRTY signal
indicates the parity on the TDAT[7:0] bus. Odd or
even parity selection is made in the TUL3 registers.
TPRTY is considered valid only when TENB is
simultaneously asserted. TPRTY is sampled on the
rising edge of TFCLK.
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 26