Altera Cyclone IV - Page 370

1–90 Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Top-Level Port Lists
Cyclone IV Device Handbook, February 2015 Altera Corporation
Volume 2
Table 1–28. PIPE Interface Ports in ALTGX Megafunction for Cyclone IV GX
(1)
(Part 1 of 2)
Port Name
Input/
Output
Clock Domain Description
fixedclk Input Clock signal
125-MHz clock for receiver detect and offset cancellation only in PIPE
mode.
tx_detectrxloop Input Asynchronous signal
Receiver detect or reverse parallel loopback control.
■ A high level in the P1 power state and tx_forceelecidle
signal asserted begins the receiver detection operation to determine
if there is a valid receiver downstream. This signal must be
deasserted when the pipephydonestatus signal indicates
receiver detect completion.
■ A high level in the P0 power state with the tx_forceelecidle
signal deasserted dynamically configures the channel to support
reverse parallel loopback mode.
tx_forcedisp
compliance
Input Asynchronous signal
Force the 8B/10B encoder to encode with negative running disparity.
■ Assert only when transmitting the first byte of the PIPE-compliance
pattern to force the 8B/10B encoder with a negative running
disparity.
pipe8b10binvpolarity Input Asynchronous signal Invert the polarity of every bit of the 10-bit input to the 8B/10B decoder
powerdn Input Asynchronous signal
PIPE power state control.
■ Signal is 2 bits wide and is encoded as follows:
■ 2'b00: P0 (Normal operation)
■ 2'b01: P0s (Low recovery time latency, low power state)
■ 2'b10: P1 (Longer recovery time latency, lower power state)
■ 2'b11: P2 (Lowest power state)
pipedatavalid Output N/A
Valid data and control on the rx_dataout and rx_ctrldetect
ports indicator.
pipephydone
status
Output Asynchronous signal
PHY function completion indicator.
■ Asserted for one clock cycle to communicate completion of several
PHY functions, such as power state transition and receiver
detection.
pipeelecidle Output Asynchronous signal
Electrical idle detected or inferred at the receiver indicator.
■ When electrical idle inference is used, this signal is driven high
when it infers an electrical idle condition
■ When electrical idle inference is not used, the
rx_signaldetect signal is inverted and driven on this port.