Cypress Pin Definitions CYV15G0404DXB Quad HOTLink II Transceiver, Transmit Path Clock Signals

CYV15G0404DXB

Pin Definitions

CYV15G0404DXB Quad HOTLink II Transceiver

Name	I/O Characteristics	Signal Description
Transmit Path Data and Status Signals
TXDA[7:0]	LVTTL Input,	Transmit Data Inputs. TXDx[7:0] data inputs are captured on the rising edge of the
TXDB[7:0]	synchronous,	transmit interface clock. The transmit interface clock is selected by the TXCKSELx
TXDC[7:0]	sampled by the	latch via the device configuration interface, and passed to the encoder or Transmit
TXDD[7:0]	associated	Shifter. When the Encoder is enabled, TXDx[7:0] specifies the specific data or
	TXCLKx↑ or	command character sent.
	REFCLKx↑[2]
TXCTA[1:0]	LVTTL Input,	Transmit Control. TXCTx[1:0] inputs are captured on the rising edge of the transmit
TXCTB[1:0]	synchronous,	interface clock. The transmit interface clock is selected by the TXCKSELx latch
TXCTC[1:0]	sampled by the	through the device configuration interface, and passed to the encoder or transmit
TXCTD[1:0]	associated	shifter. The TXCTA[1:0] inputs identify how the associated TXDx[7:0] characters are
	TXCLKx↑ or	interpreted. When the encoder is bypassed, these inputs are interpreted as data bits.
	REFCLKx↑ [2]	When the encoder is enabled, these inputs determine if the TXDx[7:0] character is
		encoded as data, a special character code, or replaced with other special character
		codes. See Table 3 for details.
TXERRA	LVTTL Output,	Transmit Path Error. TXERRx is asserted HIGH to indicate detection of a transmit
TXERRB	synchronous to	phase align buffer underflow or overflow. If an underflow or overflow condition is
TXERRC	REFCLKx↑ [3],	detected, TXERRx, for the channel in error, is asserted HIGH and remains asserted
TXERRD	synchronous to	until either a word sync sequence is transmitted on that channel, or the transmit
	RXCLKx when	phase align buffer is recentered with the PABRSTx latch through the device configu-
	selected as	ration interface. When TXBISTx = 0, the BIST progress is presented on the
	REFCLKx,	associated TXERRx output. The TXERRx signal pulses HIGH for one transmit
	asynchronous to	character clock period to indicate a pass through the BIST sequence once every 511
	transmit channel	or 527 (depending on RXCKSELx) character times. If RXCKSELx = 1, a one
	enable/disable,	character pulse occurs every 527 character times. If RXCKSELx = 0, a one character
	asynchronous to loss	pulse occurs every 511 character times.
	or return of	TXERRx is also asserted HIGH, when any of these conditions is true:
	REFCLKx±
		■ The TXPLL for the associated channel is powered down. This occurs when OE2x
		and OE1x for a given channel are simultaneous disabled by setting OE2x = 0 and
		OE1x = 0.
		■ The absence of the REFCLKx± signal.
Transmit Path Clock Signals
REFCLKA±	Differential LVPECL	Reference Clock. REFCLKx± clock inputs are used as the timing references for the
REFCLKB±	or single ended	transmit and receive PLLs. These input clocks may also be selected to clock the
REFCLKC±	LVTTL input clock	transmit and receive parallel interfaces. When driven by a single ended LVCMOS or
REFCLKD±		LVTTL clock source, connect the clock source to either the true or complement
		REFCLKx input, and leave the alternate REFCLKx input open (floating). When driven
		by an LVPECL clock source, the clock must be a differential clock, using both inputs.
TXCLKA	LVTTL Clock Input,	Transmit Path Input Clock. When configuration latch TXCKSELx = 0, the
TXCLKB	internal pull down	associated TXCLKx input is selected as the character-rate input clock for the
TXCLKC		TXDx[7:0] and TXCTx[1:0] inputs. In this mode, the TXCLKx input must be
TXCLKD		frequency-coherent to its associated TXCLKOx output clock, but may be offset in
		phase by any amount. Once initialized, TXCLKx is allowed to drift in phase as much
		as ±180 degrees. If the input phase of TXCLKx drifts beyond the handling capacity
		of the phase align buffer, TXERRx is asserted to indicate the loss of data, and remains
		asserted until the phase align buffer is initialized. The phase of the TXCLKx input
		clock relative to its associated REFCLKx± is initialized when the configuration latch
		PABRSTx is written as 0. When the associated TXERRx is deasserted, the phase
		align buffer is initialized and input characters are correctly captured.
Notes

2.When REFCLKx± is configured for half rate operation, these inputs are sampled relative to both the rising and falling edges of the associated REFCLKx±.

3.When REFCLKx± is configured for half rate operation, these outputs are presented relative to both the rising and falling edges of the associated REFCLKx±.

Document #: 38-02097 Rev. *B Page 8 of 44

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