Altera CPRI v6.0 MegaCore Function - Manual (Page 34)

CPRI v6.0 Input Clock Information
cpri_10g_coreclk Drives the CPRI v6.0 IP core clock
cpri_clkout
when the IP core
is running at the CPRI line bit rate of 10.1376 Gbps.
You must drive this clock at 307.20 MHz.
You must drive this clock from the same clock source as the
xcvr_
ext_pll_clk
input signal to the IP core.
cpu_clk
Clocks the signals on the CPRI v6.0 CPU interface. Supports any
frequency that the device fabric supports.
mii_txclk mii_txclk
clocks the MII transmitter interface and
mii_rxclk
clocks the MII receiver interface. You must drive these clocks at the
frequency of 25 MHz to achieve the 100 Mbps bandwidth required
for this interface.
These clocks are present only if you turn on Enable IEEE 802.3
100BASE-X 100Mbps MII in the CPRI v6.0 parameter editor.
mii_rxclk
Table 3-2: CPRI v6.0 IP Core Output Clocks
CPRI v6.0 Output Clock Information
cpri_clkout Master clock for the CPRI v6.0 IP core. When the IP core is
running at the CPRI line bit rate of 10.1376 Gbps, the
cpri_10g_
coreclk
input clock drives
cpri_clkout
. At all other CPRI line bit
rates, the Tx PCS drives
cpri_clkout
.
The frequency of
cpri_clkout
depends on the CPRI line bit rate:
CPRI Line Bit Rate
cpri_clkout
Frequency
0.6144 Gbps 15.36 MHz
1.2288 Gbps 30.72 MHz
2.4576 Gbps 61.44 MHz
3.0720 Gbps 76.80 MHz
4.9152 Gbps 122.88 MHz
6.1440 Gbps 153.60 MHz
9.8304 Gbps 245.76 MHz
10.1376 Gbps 307.20 MHz
xcvr_recovered_clk
Direct recovered clock from the receiver CDR. Use this output
clock to drive the external clean-up PLL when your IP core is in
slave mode.
Related Information
Adding the Clean-Up PLL on page 2-12
3-4 CPRI v6.0 IP Core Clocking Structure
UG-01156
2014.08.18
Altera Corporation Functional Description
Send Feedback