Filter
Top Products
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
21
Pin Name Type Pin
No.
Function
RADR[4]
RADR[3]
RADR[2]
RADR[1]
RADR[0]
Input
R23
P20
R22
R21
T22
UTOPIA Receive Read Address (RADR[4:0]).
The RADR[4:] signal is used to select the FIFO (and
hence port) that is read from using the RENB signal
and the FIFO whose cell available signal is visible
on the RCA output.
Note that address 0x1F is the null-PHY address and
will not be identified to any port on the
S/UNI-QUAD.
RADR[4:0] is sampled on the rising edge of RFCLK.
RCA Output N20 UTOPIA Receive multi-PHY Cell Available (RCA).
RCA indicates when a cell is available in the receive
FIFO for the port selected by RADR[4:0]. RCA can
be configured to be de-asserted when either zero or
four bytes remain in the selected/addressed FIFO.
RCA will thus transition low on the rising edge of
RFCLK after Payload word 24 (RCALEVEL0=1) or
19 (RCALEVEL0=0) is output if the PHY being
polled is the same as the PHY in use.
RCA is tristated when either the null-PHY address
(0x1F) or an address not matching the address
space is latched from the RADR[4:0] inputs when
RENB is high.
RCA is updated on the rising edge of RFCLK.
RFCLK Input P21 UTOPIA Receive FIFO Read Clock (RFCLK).
RFCLK is used to read ATM cells from the receive
FIFO’s. RFCLK must cycle at a 50 MHz or lower
instantaneous rate, but at a high enough rate to
avoid FIFO overflows.