CYP15G0101DXB Datasheet, PDF (7/39 Pages) Cypress Semiconductor – Single-channel HOTLink II™ Transceiver

CYP15G0101DXB
CYV15G0101DXB
CYW15G0101DXB
Pin Descriptions CYP(V)(W)15G0101DXB Single-channel HOTLink II (continued)
Pin Name I/O Characteristics Signal Description
Receive Path Data Signals
RXD[7:0]
LVTTL Output,
Parallel Data Output. These outputs change following the rising edge of the selected
synchronous to the receive interface clock.
RXCLK↑ output
(or REFCLK↑ input^[3]
when RXCKSEL =
LOW)
When the Decoder is enabled (DECMODE = HIGH or MID), these outputs represent either
received data or a special character. The status of the received data is represented by the
values of RXST[2:0].
When the Decoder is bypassed (DECMODE = LOW), RXD[7:0] become the higher order
bits of the 10-bit received character. See Table 13 for details.
RXST[2:0]
LVTTL Output,
Parallel Status Output. These outputs change following the rising edge of the selected
synchronous to the receive interface clock.
RXCLK↑ output
(or REFCLK↑ input^[3]
when RXCKSEL =
When the Decoder is bypassed (DECMODE = LOW), RXST[1:0] become the two low-order
bits of the 10-bit received character, while RXST[2] = HIGH indicates the presence of a
Comma character in the Output Register.
LOW)
When the Decoder is enabled (DECMODE = HIGH or MID), RXST[2:0] provide status of
the received signal. See Table 16 for a list of Receive Character status.
RXOP
3-state, LVTTL
Receive Path Odd Parity. When parity generation is enabled (PARCTL ≠ LOW), the parity
Output, synchronous output is valid for the data on the RXD bus bits.
to the RXCLK↑
output (or REFCLK↑
input^[3] when
When parity
(High-Z).
generation
is
disabled
(PARCTL = LOW),
this
output
driver
is
disabled
RXCKSEL = LOW)
Receive Path Clock and Clock Control
RXCLK±
3-state, LVTTL
Output clock
Receive Character Clock Output. When configured such that the output data path is
clocked by the recovered clock (RXCKSEL = MID), these true and complement clocks are
the receive interface clocks which are used to control timing of output data (RXD[7:0],
RXST[2:0] and RXOP). This clock is output continuously at either the dual-character rate
(1/20^th the serial bit-rate) or character rate (1/10^th the serial bit-rate) of the data being
received, as selected by RXRATE.
When configured such that the output data path is clocked by REFCLK instead of recovered
clock (RXCKSEL = LOW), the RXCLK± output drivers present a buffered and delayed form
of REFCLK. In this mode, RXCLK± and RXCLKC+ are buffered forms of REFCLK that are
slightly different in phase, but follow the frequency and duty cycle of REFCLK. This phase
difference allows the user to select the optimal set-up/hold timing for their specific interface.
RXCLKC+ 3-state, LVTTL
Output
Delayed REFCLK+ when RXCKSEL = LOW. Delayed form of REFCLK+, used for transfer
of output data to a host system. This output is only enabled when the receive parallel
interface is configured to present data relative to REFCLK (RXCKSEL = LOW). When
RXCKSEL = LOW, the RXCLKC+ follows the frequency and duty cycle of REFCLK+.
RXRATE
LVTTL Input
Receive Clock Rate Select. When LOW, the RXCLK± recovered clock outputs are comple-
Static Control Input, mentary clocks operating at the recovered character rate. Data for the receive channel
internal pull-down should be latched on either the rising edge of RXCLK+ or falling edge of RXCLK–.
When HIGH, the RXCLK± recovered clock outputs are complementary clocks operating at
half the character rate. Data for the receive channel should be latched alternately on the
rising edge of RXCLK+ and RXCLK–.
When the output register is operated with REFCLK clocking (RXCKSEL = LOW), RXRATE
is not interpreted and RXCLK± follows the frequency and duty cycle of REFCLK.
RFEN
RXMODE
LVTTL input,
asynchronous,
internal pull-down
3-Level Select^[4]
static control input
Reframe Enable. Active HIGH. When HIGH, the Framer in the receive channel is enabled
to frame per the presently enabled framing mode and selected framing character.
Receive Operating Mode. This input selects one of two RXST channel status reporting
modes and is only interpreted when the Decoder is enabled (DECMODE ≠ LOW). See
Table 12 for details.
Document #: 38-02031 Rev. *J
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