Altera Cyclone IV - Page 369

Chapter 1: Cyclone IV Transceivers Architecture 1–89
Transceiver Top-Level Port Lists
February 2015 Altera Corporation Cyclone IV Device Handbook,
Volume 2
RX PCS
rx_coreclk Output Clock signal
Optional read clock port for the RX phase compensation
FIFO.
rx_phase_comp_fifo
_error
Output
Synchronous to tx_clkout
(non-bonded modes) or
coreclkout (bonded modes)
RX phase compensation FIFO full or empty indicator.
■ A high level indicates FIFO is either full or empty.
rx_bitslipboundarys
electout
Output Asynchronous signal.
Indicate the number of bits slipped in the word aligner
configured in manual alignment mode.
■ Values range from 0 to 9.
RX PMA
rx_datain Input N/A Receiver serial data input port.
rx_freqlocked Output Asynchronous signal
Receiver CDR lock state indicator
■ A high level indicates the CDR is in LTD state.
■ A low level indicates the CDR is in LTR state.
rx_locktodata Input Asynchronous signal
Receiver CDR LTD state control signal
■ A high level forces the CDR to LTD state
■ When deasserted, the receiver CDR lock state
depends on the rx_locktorefclk signal level.
rx_locktorefclk Input Asynchronous signal
Receiver CDR LTR state control signal.
■ The rx_locktorefclk and rx_locktodata
signals control whether the receiver CDR states as
follows:
[rx_locktodata:rx_locktorefclk]
■ 2'b00—receiver CDR is in automatic lock mode
■ 2b'01—receiver CDR is in manual lock mode (LTR
state)
■ 2b'1x—receiver CDR is in manual lock mode (LTD
state)
rx_signaldetect Output Asynchronous signal
Signal threshold detect indicator.
■ Available in Basic mode when 8B/10B
encoder/decoder is used, and in PIPE mode.
■ A high level indicates that the signal present at the
receiver input buffer is above the programmed signal
detection threshold value.
rx_recovclkout Output Clock signal
CDR low-speed recovered clock
■ Only available in the GIGE mode for applications such
as Synchronous Ethernet.
Table 1–27. Receiver Ports in ALTGX Megafunction for Cyclone IV GX (Part 3 of 3)
Block Port Name
Input/
Output
Clock Domain Description