PMC-Sierra PM5349 manual Rprty, Rsoc, Renb

		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.
	RPRTY	Output	T21	UTOPIA Receive Parity (RPRTY).
				The receive parity (RPRTY) signal indicates the
				parity of the RDAT bus. RPRTY reflects the parity of
				RDAT[15:0]. Odd or even parity selection is made
				independently for every channel by using the
				RXPTYP register bit (in ATM cell processors, the
				four RXCP shall be programmed with the same
				parity setting).RPRTY is tristated when RENB is
				high. RPRTY is also 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.
				RPRTY is updated on the rising edge of RFCLK.
	RSOC	Output	P23	UTOPIA Receive Start of Cell (RSOC).
				RSOC marks the start of cell on the RDAT bus.
				RSOC is tristated when RENB is deasserted.
				RSOC is also 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.
				RSOC is sampled on the rising edge of RFCLK.
	RENB	Input	P22	UTOPIA Receive multi-PHY Read Enable (RENB).
				The RENB signal is used to initiate reads from the
				receive FIFO’s. RENB works as follows. When
				RENB is sampled high, no read is performed and
				RDAT[15:0], RPRTY and RSOC are tristated, and
				the address on RADR[4:0] is latched to select the
				device or port for the next FIFO access. When
				RENB is sampled low, the word on the RDAT bus is
				read from the selected receive FIFO.
				RENB must operate in conjunction with RFCLK to
				access the FIFO’s at a high enough rate to prevent
				FIFO overflows. The system may de-assert RENB
				at anytime it is unable to accept another byte.
				RENB is sampled on the rising edge of RFCLK.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use					20