Stratix GX Transceivers
Transmitter Path
This section describes the data path through the Stratix GX transmitter
(see Figure 2–2). Data travels through the Stratix GX transmitter via the
following modules:
■
■
■
■
■
■
Transmitter PLL
Transmitter phase compensation FIFO buffer
Byte serializer
8B/10B encoder
Serializer (parallel to serial converter)
Transmitter output buffer
Transmitter PLL
Each transceiver block has one transmitter PLL, which receives the
reference clock and generates the following signals:
■
■
■
High-speed serial clock used by the serializer
Slow-speed reference clock used by the receiver
Slow-speed clock used by the logic array (divisible by two for
double-width mode)
The INCLKclock is the input into the transmitter PLL. There is one INCLK
clock per transceiver block. This clock can be fed by either the REFCLKB
pin, PLD routing, or the inter-transceiver routing line. See the section
“Stratix GX Clocking” on page 2–30 for more information about the inter-
transceiver lines.
The transmitter PLL in each transceiver block clocks the circuits in the
transmit path. The transmitter PLL is also used to train the receiver PLL.
If no transmit channels are used in the transceiver block, the transmitter
PLL can be turned off. Figure 2–3 is a block diagram of the transmitter
PLL.
Altera Corporation
June 2006
2–5
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
