Cypress CYV15G0404DXB manual Name Characteristics Signal Description, Status Signals

CYV15G0404DXB

Pin Definitions (continued)

CYV15G0404DXB Quad HOTLink II Transceiver

Name	I/O Characteristics	Signal Description
TXCLKOA	LVTTL Output	Transmit Clock Output. TXCLKOx output clock is synthesized by each channel’s
TXCLKOB		transmit PLL and operates synchronous to the internal transmit character clock.
TXCLKOC		TXCLKOx operates at either the same frequency as REFCLKx± (TXRATE = 0), or at
TXCLKOD		twice the frequency of REFCLKx± (TXRATE = 1). The transmit clock outputs have no
		fixed phase relationship to REFCLKx±.
Receive Path Data	and Status Signals
RXDA[7:0]	LVTTL Output,	Parallel Data Output. RXDx[7:0] parallel data outputs change relative to the receive
RXDB[7:0]	synchronous to the	interface clock. The receive interface clock is selected by the RXCKSELx latch. If
RXDC[7:0]	selected RXCLK±	RXCLKx± is a full rate clock, the RXCLKx± clock outputs are complementary clocks
RXDD[7:0]	output or REFCLKx±	operating at the character rate. The RXDx[7:0] outputs for the associated receive
	input	channels follow rising edge of RXCLKx+ or falling edge of RXCLKx–. If RXCLKx± is
		a half rate clock, the RXCLKx± clock outputs are complementary clocks operating at
		half the character rate. The RXDx[7:0] outputs for the associated receive channels
		follow both the falling and rising edges of the associated RXCLKx± clock outputs.
RXSTA[2:0]	LVTTL Output,	Parallel Status Output. RXSTA[2:0] status outputs change relative to the receive
RXSTB[2:0]	synchronous to the	interface clock. The receive interface clock is selected by the RXCKSELx latch. If
RXSTC[2:0]	selected RXCLK±	RXCLKx± is a full rate clock, the RXCLKx± clock outputs are complementary clocks
RXSTD[2:0]	output or REFCLKx±	operating at the character rate. The RXSTAx[2:0] outputs for the associated receive
	input	channels follow rising edge of RXCLKx+ or falling edge of RXCLKx–. If RXCLKx± is
		a half rate clock, the RXCLKx± clock outputs are complementary clocks operating at
		half the character rate. The RXSTAx[2:0] outputs for the associated receive channels
		follow both the falling and rising edges of the associated RXCLKx± clock outputs.
		When the decoder is bypassed, RXSTx[1:0] become the two low-order bits of the
		10-bit received character. RXSTx[2] = HIGH indicates the presence of a Comma
		character in the Output Register. When the decoder is enabled, RXSTx[2:0] provide
		status of the received signal. See Table 11 for a list of received character status.
Receive Path Clock Signals
RXCLKA±	LVTTL Output Clock	Receive Clock Output. RXCLKx± is the receive interface clock used to control timing
RXCLKB±		of the RXDx[7:0] and RXSTA[2:0] parallel outputs. The source of the RXCLKx±
RXCLKC±		outputs is selected by the RXCKSELx latch via the device configuration interface.
RXCLKD±		These true and complement clocks are used to control timing of data output transfers.
		These clocks are output continuously at either the dual-character rate (1/20th the
		serial bit-rate) or character rate (1/10th the serial bit-rate) of the data being received,
		as selected by RXRATEx. When configured such that the output data path is clocked
		by the REFCLKx± instead of a recovered clock, the RXCLKx± output drivers present
		a buffered or divided form (depending on RXRATEx) of the associated REFCLKx±
		that are delayed in phase to align with the data. This phase difference allows the user
		to select the optimal clock (REFCLKx± or RXCLK±) for setup or hold timing for their
		specific system.
		When REFCLKx± is a full rate clock, the RXCLKx± rate depends on the value of
		RXRATEx.
		When REFCLKx± is a half rate clock and RXCKSELx = 0, the RXCLKx± rate depends
		on the value of RXRATEx.
		When REFCLKx± is a half rate clock and RXCKSELx=1, the RXCLKx± rate does not
		depend on the value of RXRATEx and operates at the same rate as REFCLKx±.
Device Control	Signals
RESET	LVTTL Input,	Asynchronous Device Reset.	RESET	initializes all state machines, counters, and
	asynchronous,	configuration latches in the device to a known state.			RESET	must be asserted LOW
	internal pull up	for a minimum pulse width. When the reset is removed, all state machines, counters,
		and configuration latches are at an initial state. As per the JTAG specifications, the
		device RESET cannot reset the JTAG controller. Therefore, the JTAG controller has
		to be reset separately. Refer to JTAG Support on page 23 for the methods to reset
		the JTAG state machine. See Table 9 for the initialize values of the device configu-
		ration latches.
Document #: 38-02097 Rev. *B						Page 9 of 44

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