PMC-Sierra PM5349 DTCA4, DTCA3, DTCA2, DTCA1, RDAT9, RDAT8, RDAT7, RDAT6, RDAT5, RDAT4, Rfclk

		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.
DTCA[4]	Output	K22	UTOPIA Direct Transmit Cell Available (DTCA[4:1]).
DTCA[3]		K23	These output signals provide direct status indication
DTCA[2]		L20
			of when a cell is available in the transmit FIFO for
DTCA[1]		L21
			the corresponding port. When high, DTCA indicates
			that the corresponding transmit FIFO is not full and
			a complete cell may be written. When DTCA goes
			low, it can be configured to indicate either that the
			corresponding transmit FIFO is near full or that the
			corresponding transmit FIFO is full. DTCA will
			transition low on the rising edge of TFCLK after the
			Payload word 19 (TCALEVEL0=0) or 23
			(TCALEVEL0=1) is sampled if the PHY being polled
			is the same as the PHY in use. To reduce FIFO
			latency, the FIFO depth at which DTCA indicates
			"full" can be set to one, two, three or four cells. Note
			that regardless of what fill level DTCA is set to
			indicate "full" at, the transmit cell processor can
			store 4 complete cells
			DTCA[4:1] are updated on the rising edge of
			TFCLK.
RDAT[15]	Output	U23	UTOPIA Receive Cell Data Bus (RDAT[15:0]).
RDAT[14]		U22	This data bus carries the ATM cells that are read
RDAT[13]		T20
			from the receive FIFO selected by RADR[4:0].
RDAT[12]		U21
			RDAT[15:0] is tri-stated when RENB is high.
RDAT[11]		V22
			RDAT[15:0] is tristated when RENB is high.
RDAT[10]		W23
RDAT[9]		U20	RDAT[15:0] is also tristated when either the null-
RDAT[8]		V21	PHY address (0x1F) or an address not matching
RDAT[7]		W22	the address space is latched from the RADR[4:0]
RDAT[6]		Y23	inputs when RENB is high.
RDAT[5]		W21	RDAT[15:0] is updated on the rising edge of
RDAT[4]		Y22
			RFCLK.
RDAT[3]		AA23
RDAT[2]		W20
RDAT[1]		Y21
RDAT[0]		AA20

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 19