EP4SE360F35I4 Datasheet, PDF (298/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

8–18
Chapter 8: High-Speed Differential I/O Interfaces and DPA in Stratix IV Devices
Differential Receiver
Non-DPA mode allows you to statically select the optimal phase between the source
synchronous clock and the received serial data to compensate skew. In DPA mode, the
DPA circuitry automatically chooses the best phase to compensate for the skew
between the source synchronous clock and the received serial data. Soft-CDR mode
provides opportunities for synchronous and asynchronous applications for
chip-to-chip and short reach board-to-board applications for SGMII protocols.
Figure 8–12. Receiver Block Diagram ⁽¹⁾, ⁽²⁾
10
rx_out
IOE Supports SDR, DDR, or Non-Registered Datapath
2
IOE
FPGA
Fabric
rx_divfwdclk
rx_outclock
Deserializer
DOUT DIN
Bit Slip
DOUT DIN
2
(LOAD_EN, diffioclk)
diffioclk
Clock Mux
LVDS Receiver
+
rx_in
Synchronizer
DOUT DIN
DPA Circuitry
Retimed
Data ^DIN
DPA Clock
3
(DPA_LOAD_EN,
DPA_diffioclk,
rx_divfwdclk)
3 _{(LVDS_LOAD_EN,}
LVDS_diffioclk,
rx_outclk)
Left/Right PLL
rx_inclock
Notes to Figure 8–12:
(1) In SDR and DDR modes, the data width from the IOE is 1 and 2 bits, respectively.
(2) The rx_out port has a maximum data width of 10 bits.
8 Serial LVDS
Clock Phases
LVDS Clock Domain
DPA Clock Domain
Differential I/O Termination
The Stratix IV device family provides a 100- on-chip differential termination option
on each differential receiver channel for LVDS standards. On-chip termination saves
board space by eliminating the need to add external resistors on the board. You can
enable on-chip termination in the Quartus II software Assignment Editor.
On-chip differential termination is supported on all row I/O pins and dedicated clock
input pins (CLK[0,2,9,11]). It is not supported for column I/O pins, dedicated clock
input pins (CLK[1,3,8,10]), or the corner PLL clock inputs.
Stratix IV Device Handbook
Volume 1
September 2012 Altera Corporation