PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
Pin Name
Type
Pin No. Function
RSOC
Output M17
Receive Start of Cell (RSOC). This signal
marks the start of cell on the RDAT bus.
RSOC marks the start of the cell on the
RDAT bus.
RSOC is tri-stated when either the null-
PHY address (1FH) or an address not
matching the address space set by
PHY_ADR[2:0] is latched from the
RADR[4:0] inputs when RENB is high.
RENB
Input
N18
Receive Multi-Phy Read Enable (RENB).
The RENB signal is used to initiate reads
from the receive FIFOs. When sampled
low using the rising edge of RFCLK, a byte
is read (if one is available) from the receive
FIFO selected by the RADR[4:0] address
bus and output on the RDAT bus. When
sampled high using the rising edge of
RFCLK, no read is performed and
RDAT[15:0], RPRTY, and RSOC are tri-
stated, and the address on RADR[4:0] is
latched to select the device or port for the
next ATM FIFO access. RENB must
operate in conjunction with RFCLK to
access the FIFOs at a high enough rate to
prevent FIFO overflows. The ATM layer
device may de-assert RENB at anytime it
is unable to accept another byte.
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 47
PMC [ PMC-SIERRA, INC ]
