HC4GX15 Datasheet, PDF (282/668 Pages) Altera Corporation – HardCopy IV Device Handbook

1–18
Chapter 1: HardCopy IV GX Transceiver Architecture
Transceiver Port List
Table 1–2. HardCopy IV GX ALTGX Megafunction Ports (Part 11 of 14)
Port Name
tx_invpolarity
Input/Output
Description
Input
Transmitter polarity inversion control. This
feature is useful for correcting situations in
which the positive and negative signals of the
differential serial link are accidentally swapped
during board layout. When asserted high in
single-width modes, the polarity of every bit of
the 8-bit or 10-bit input data to the serializer
gets inverted. When asserted high in
double-width modes, the polarity of every bit of
the 16-bit or 20-bit input data to the serializer
gets inverted.
Asynchronous signal.
Transmitter Physical Media Attachment
tx_dataout
Output
fixedclk
Input
Transmitter serial data output port.
125-MHz clock for receiver detect and offset
cancellation in PCI Express (PIPE) mode.
Dynamic Reconfiguration
reconfig_clk
reconfig_togxb
reconfig_fromgxb
Input
Input
Output
Dynamic reconfiguration clock. This clock is
also used for offset cancellation in all modes
except PIPE mode. The frequency range of this
clock is 2.5 MHz to 50 MHz when the
transceiver channel is configured in
Transmitter only mode. The frequency range of
this clock is 37.5 MHz to 50 MHz when the
transceiver channel is configured in Receiver
only or Receiver and Transceiver mode.
From the dynamic reconfiguration controller.
To the dynamic reconfiguration controller.
PCI Express (PIPE) Interface (Available only in PIPE Functional Mode)
powerdn
Input
PIPE power state control. Functionally
equivalent to the powerdown[1:0] signal
defined in the PIPE specification revision 2.0.
The width of this signal is two bits 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
Scope
Channel
Channel
Channel
Channel
HardCopy IV Device Handbook Volume 3
© June 2009 Altera Corporation