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EP4CE30F29C7N Datasheet, PDF (332/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1 | |||
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Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Functional Modes
Receiver Spread Spectrum Clocking
Asynchronous SSC is not supported in Cyclone IV devices. You can implement only
synchronous SSC for SATA, V-by-One, and Display Port protocols in Basic mode.
PCI Express (PIPE) Mode
PIPE mode provides the transceiver channel datapath configuration that supports Ã1,
Ã2, and Ã4 initial lane width for PCIe Gen1 signaling rate with PIPE interface
implementation. The Cyclone IV GX transceiver provides following features in PIPE
mode:
â PIPE interface
â receiver detection circuitry
â electrical idle control
â signal detect at receiver
â lane synchronization with compliant state machine
â clock rate compensation with rate match FIFO
â Low-Latency Synchronous PCIe
â fast recovery from P0s state
â electrical idle inference
â compliance pattern transmission
â reset requirement
Figure 1â48 shows the transceiver channel datapath and clocking when configured in
PIPE mode with Ã1 channel configuration.
.
Figure 1â48. Transceiver Channel Datapath and Clocking when Configured in PIPE Mode with Ã1 Channel Configuration
FPGA
Fabric
Tx Phase
Comp
FIFO
wr_clk rd_clk
Transmitter Channel PCS
Byte Serializer
wr_clk rd_clk
/2
8B/10B Encoder
Transmitter Channel PMA
Serializer
high-speed
clock
low-speed clock
Notes to Figure 1â48:
(1) Low-speed recovered clock.
(2) High-speed recovered clock.
Rx
Phase
Comp
FIFO
Byte
Order-
ing
Byte
De-
serializer
/2
Receiver Channel PCS
8B/10B
Decoder
Rate
Match
FIFO
Receiver Channel PMA
Deskew
FIFO
Word
Aligner
(1)
Deserial-
izer
CDR
CDR clock
(2)
Cyclone IV Device Handbook,
Volume 2
October 2013 Altera Corporation
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