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CYV15G0104TRB
Document #: 38-02100 Rev. *B Page 6 of 27
Pin Definitions
CYV15G0104TRB HOTLink II Serializer and Reclocking Deserializer
Name I/O Characteristics Signal Description
Transmit Path Data and Status Signals
TXDB[9:0] LVTTL Input,
synchronous,
sampled by
TXCLKB↑ or
REFCLKB↑
[2]
Transmit Data Inputs. TXDB[9:0] data inputs are captured on the rising edge of the
transmit interface clock. The transmit interface clock is selected by the TXCKSELB latch
via the device configuration interface.
TXERRB LVTTL Output,
synchronous to
REFCLKB↑
[3]
,
asynchronous to
transmit channel
enable / disable,
asynchronous to loss
or return of
REFCLKB±
Transmit Path Error. TXERRB is asserted HIGH to indicate detection of a transmit
Phase-Align Buffer underflow or overflow. If an underflow or overflow condition is
detected, TXERRB, is asserted HIGH and remains asserted until the transmit Phase-Align
Buffer is re-centered with the PABRSTB latch via the device configuration interface. When
TXBISTB = 0, the BIST progress is presented on the TXERRB output. The TXERRB
signal pulses HIGH for one transmit-character clock period to indicate a pass through the
BIST sequence once every 511 character times.
TXERRB is also asserted HIGH, when any of the following conditions is true:
• The TXPLL is powered down. This occurs when TOE2B and TOE1B are both disabled
by setting TOE2B = 0 and TOE1B = 0.
• The absence of the REFCLKB± signal.
Transmit Path Clock Signals
REFCLKB± Differential LVPECL
or single-ended
LVTTL input clock
Reference Clock. REFCLKB± clock inputs are used as the timing reference for the
transmit PLL. This input clock may also be selected to clock the transmit parallel interface.
When driven by a single-ended LVCMOS or LVTTL clock source, connect the clock source
to either the true or complement REFCLKB input, and leave the alternate REFCLKB input
open (floating). When driven by an LVPECL clock source, the clock must be a differential
clock, using both inputs.
TXCLKB LVTTL Clock Input,
internal pull-down
Transmit Path Input Clock. When configuration latch TXCKSELB = 0, the associated
TXCLKB input is selected as the character-rate input clock for the TXDB[9:0] input. In this
mode, the TXCLKB input must be frequency-coherent to its TXCLKOB output clock, but
may be offset in phase by any amount. Once initialized, TXCLKB is allowed to drift in
phase by as much as ±180 degrees. If the input phase of TXCLKB drifts beyond the
handling capacity of the Phase Align Buffer, TXERRB is asserted to indicate the loss of
data, and remains asserted until the Phase Align Buffer is initialized. The phase of
TXCLKB relative to REFCLKB± is initialized when the configuration latch PABRSTB is
written as 0. When TXERRB is deasserted, the Phase Align Buffer is initialized and input
characters are correctly captured.
TXCLKOB LVTTL Output Transmit Clock Output. TXCLKOB output clock is synthesized by the transmit PLL and
operates synchronous to the internal transmit character clock. TXCLKOB operates at
either the same frequency as REFCLKB± (TXRATEB = 0), or at twice the frequency of
REFCLKB± (TXRATEB = 1). The transmit clock outputs have no fixed phase relationship
to REFCLKB±.
Receive Path Data and Status Signals
RXDA[9:0] LVTTL Output,
synchronous to the
RXCLKA ± output
Parallel Data Output. RXDA[9:0] parallel data outputs change relative to the receive
interface clock. If RXCLKA± is a full-rate clock, the RXCLKA± clock outputs are comple-
mentary clocks operating at the character rate. The RXDA[9:0] outputs for the associated
receive channels follow rising edge of RXCLKA+ or falling edge of RXCLKA–. If RXCLKA±
is a half-rate clock, the RXCLKA± clock outputs are complementary clocks operating at
half the character rate. The RXDA[9:0] outputs for the associated receive channels follow
both the falling and rising edges of the associated RXCLKA± clock outputs.
When BIST is enabled on the receive channel, the BIST status is presented on the
RXDA[1:0] and BISTSTA outputs. See Table 6 for each status reported by the BIST state
machine. Also, while BIST is enabled, the RXDA[9:2] outputs should be ignored.
Notes:
2. When REFCLKB± is configured for half-rate operation, these inputs are sampled relative to both the rising and falling edges of the associated REFCLKB±.
3. When REFCLKB± is configured for half-rate operation, this output is presented relative to both the rising and falling edges of the associated REFCLKB±.
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