HC4GX15 Datasheet, PDF (383/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
Functional Modes
1–119
Table 1–30 shows the PCS-PMA interface widths and data rates supported in Basic
single-width and double-width modes.
Table 1–30. PCS-PMA Interface Widths and Data Rates in Basic Single-Width and Double-Width
Modes
Basic Functional Mode Supported Data Rate Range (1) PMA-PCS Interface Width
Basic single-width mode
600 Mbps to 3.75 Gbps
8 bit
10 bit
Basic double-width mode
1 Gbps to 6.5 Gbps
16 bit
20 bit
Note to Table 1–30:
(1) The data rate range supported in Basic single-width and double-width modes varies depending on whether or not
you use the byte serializer/deserializer. For more information, refer to “Basic Single-Width Mode Configurations”
on page 1–120 and “Basic Double-Width Mode Configurations” on page 1–122.
Low Latency PCS Datapath
The ALTGX MegaWizard Plug-In Manager provides an Enable low latency PCS
mode option when configured in Basic single-width or Basic double-width mode. If
you select this option, the following transmitter and receiver channel PCS blocks are
bypassed to yield a low latency PCS datapath:
■ 8B/10B encoder and decoder
■ Word aligner
■ Deskew FIFO
■ Rate match (clock rate compensation) FIFO
■ Byte ordering
In low latency PCS modes, the transmitter and receiver phase compensation FIFOs are
always enabled. Depending on the targeted data rate, you can optionally bypass the
byte serializer and deserializer blocks. Refer to “Basic Single-Width Mode
Configurations” on page 1–120 and “Basic Double-Width Mode Configurations” on
page 1–122 for more information.
1 PCS latency in Basic single-width and Basic double-width modes with and without
the low latency PCS mode option is pending characterization.
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3