PMC-Sierra PM5349 manual RADR4, RADR3, RADR2, RADR1, RADR0, Uni-Quad, Rca

		PMC-Sierra, Inc.	PM5349 S/UNI-QUAD
S/UNI-QUAD
DATASHEET
PMC-971239	ISSUE 6		SATURN USER NETWORK INTERFACE (155-QUAD)

Pin Name	Type	Pin	Function
		No.
RADR[4]	Input	R23	UTOPIA Receive Read Address (RADR[4:0]).
RADR[3]		P20	The RADR[4:] signal is used to select the FIFO (and
RADR[2]		R22
			hence port) that is read from using the RENB signal
RADR[1]		R21
			and the FIFO whose cell available signal is visible
RADR[0]		T22
			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.

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