Transmitter Clock Network - Altera Cyclone V Device Handbook

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2013.05.06
Figure 2-6: x1 Clock Line Architecture
The x1 clock lines are driven by serial clocks of CMU PLLs from channels 1 and 4. The serial clock in the
x1 clock line is then distributed to the local and central clock dividers of every channel within both the
neighboring transceiver banks.
Note: When you configure the channel PLL as a CMU PLL to drive the local clock divider, or the central
clock divider of its own channel, you cannot use the channel PLL as a CDR. Without a CDR, you
can use the channel only as a transmitter channel.
Transceiver Clocking in Cyclone V Devices
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CMU PLL
CH5
Local Clock Divider
CMU PLL
CH4
Local Clock Divider
CMU PLL
CH3
Local Clock Divider
CMU PLL
CH2
Local Clock Divider
CMU PLL
CH1
Local Clock Divider
CMU PLL
CH0
Local Clock Divider
Note: All clock lines shown in this figure carry the serial clock only.

Transmitter Clock Network

x1_top x1_bot
2-7
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