Visible to Intel only — GUID: sam1403477982222
Ixiasoft
Visible to Intel only — GUID: sam1403477982222
Ixiasoft
6.2.2.2. Altera_PLL Parameter Values for External PLL Mode
The following examples show the clocking requirements to generate output clocks for ALTLVDS_TX and ALTLVDS_RX using the Altera_PLL IP core. The examples set the phase shift with the assumption that the clock and data are edge aligned at the pins of the device.
Parameter | outclk0 (Connects to the tx_inclock port of ALTLVDS_TX and the rx_inclock port of ALTLVDS_RX) |
outclk1 (Connects to the tx_enable port of ALTLVDS_TX and the rx_enable port of ALTLVDS_RX) |
outclk2 (Used as the core clock for the parallel data registers for both transmitter and receiver, and connects to the rx_synclock port of ALTLVDS_RX) |
---|---|---|---|
Frequency | data rate |
data rate/serialization factor |
data rate/serialization factor |
Phase shift | –180° |
[(deserialization factor – 2)/deserialization factor] x 360° |
–180/serialization factor (outclk0 phase shift divided by the serialization factor) |
Duty cycle | 50% |
100/serialization factor | 50% |
The calculations for phase shift, using the RSKM equation, assume that the input clock and serial data are edge aligned. Introducing a phase shift of –180° to sampling clock (c0) ensures that the input data is center-aligned with respect to the outclk0, as shown in the following figure.
Parameter | outclk0 (Connects to the tx_inclock port of ALTLVDS_TX and the rx_inclock port of ALTLVDS_RX) |
outclk1 (Connects to the tx_enable port of ALTLVDS_TX and the rx_enable port of ALTLVDS_RX) |
outclk2 (Used as the core clock for the parallel data registers for both transmitter and receiver, and connects to the rx_synclock port of ALTLVDS_RX) |
outclk3 (Connects to the rx_dpaclock port of ALTLVDS_RX) |
---|---|---|---|---|
Frequency | data rate |
data rate/serialization factor |
data rate/serialization factor |
data rate |
Phase shift | –180° |
[(deserialization factor - 2)/deserialization factor] x 360° |
–180/serialization factor (outclk0 phase shift divided by the serialization factor) |
–180° |
Duty cycle | 50% |
100/serialization factor | 50% |
50% |