PMC-Sierra PM5349 manual Microprocessor Interface Signals Pin Name Type Function, Csb, Rdb, Wrb

PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)

9.3Microprocessor Interface Signals

Pin Name	Type	Pin	Function
		No.
CSB	Input	B11	The active-low chip select (CSB) signal is low
			during S/UNI-QUAD register accesses.
			Note that when not being used, CSB must be tied
			high. If CSB is not required (i.e., registers accesses
			are controlled using the RDB and WRB signals
			only), CSB must be connected to an inverted
			version of the RSTB input.
RDB	Input	D11	The active-low read enable (RDB) signal is low
			during S/UNI-QUAD register read accesses. The
			S/UNI-QUAD drives the D[7:0] bus with the contents
			of the addressed register while RDB and CSB are
			low.
WRB	Input	A10	The active-low write strobe (WRB) signal is low
			during a S/UNI-QUAD register write accesses. The
			D[7:0] bus contents are clocked into the addressed
			register on the rising WRB edge while CSB is low.
D[0]	I/O	D16	The bi-directional data bus D[7:0] is used during
D[1]		B17	S/UNI-QUAD register read and write accesses.
D[2]		A17
D[3]		C16
D[4]		B16
D[5]		C15
D[6]		B15
D[7]		D14
A[0]	Input	A15	The address bus A[9:0] selects specific registers
A[1]		C14	during S/UNI-QUAD register accesses.
A[2]		B14	Except for S/UNI-QUAD global registers, the A[9:8]
A[3]		A14
			bits allow to select which channel is being
A[4]		D13
			accessed. The A[7:0] bits allow to select which
A[5]		C13
			register is being access within a given channel
A[6]		B13
			address space.
A[7]		A13
A[8]		C12
A[9]		B12

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