EP4CE30F29C7N Datasheet, PDF (369/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Top-Level Port Lists
1–89
Table 1–27. Receiver Ports in ALTGX Megafunction for Cyclone IV GX (Part 3 of 3)
Block Port Name
Input/
Output
Clock Domain
rx_coreclk
Output Clock signal
RX PCS
rx_phase_comp_fifo
_error
Output
Synchronous to tx_clkout
(non-bonded modes) or
coreclkout (bonded modes)
rx_bitslipboundarys
electout
Output Asynchronous signal.
rx_datain
Input N/A
rx_freqlocked
Output Asynchronous signal
rx_locktodata
Input Asynchronous signal
RX PMA ^{rx_locktorefclk}
Input Asynchronous signal
rx_signaldetect
Output Asynchronous signal
rx_recovclkout
Output Clock signal
Description
Optional read clock port for the RX phase compensation
FIFO.
RX phase compensation FIFO full or empty indicator.
■ A high level indicates FIFO is either full or empty.
Indicate the number of bits slipped in the word aligner
configured in manual alignment mode.
■ Values range from 0 to 9.
Receiver serial data input port.
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.
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.
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)
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.
CDR low-speed recovered clock
■ Only available in the GIGE mode for applications such
as Synchronous Ethernet.
October 2013 Altera Corporation
Cyclone IV Device Handbook,
Volume 2