5
LatticeXP Standard Evaluation Board
Lattice Semiconductor User’s Guide
mary clock inputs and device PLL inputs. Clock outputs connect to PLL outputs and external feedback pins. Table
describes the clock connections to the LatticeXP device.
The oscillator socket accepts both full-size and half-size oscillators and can route to different clock inputs, depend-
ing on installation of several 0
Ω
resistors. The oscillator has a 22
Ω
series termination resistor at the oscillator out-
put. These inputs correspond with PCLKT0, RLM0_PLLT_IN_A and RUM0_PLLT_IN_A. The oscillator supply
voltage is changeable, via the VCC_OSC header, located at JP9. The onboard oscillator operates at 3.3V. It is pos-
sible to power this socket from the following supplies: 3.3V, VCCIO0, VCCIO2 or VCCIO3, depending on the I/O
bank being used and the operating conditions for the chosen oscillator.
Table 2. Lattice XP-10 Clock Pins and Connections
XP-10 Pin Number XP Pin Label PCB Connection
1
On-Board OSC.
Resistor
2
Buffered (Y/N)
3
N16 RLM0_PLLT_IN_A J23-15 R89 Y
M16 RLM0_PLLC_IN_A J23-16 N/A N
L13 RLM0_PLLT_OUT_A J23-9 N/A N
M14 RLM0_PLLC_OUT_A J23-10 N/A N
N15 RLM0_PLLT_FB_A J23-17 N/A N
P15 RLM0_PLLC_FB_A J23-18 N/A N
F16 RUM0_PLLT_IN_A J24-7 R90 Y
G16 RUM0_PLLC_IN_A J24-8 N/A N
F13 RUM0_PLLT_OUT_A J24-17 N/A N
G12 RUM0_PLLC_OUT_A J24-18 N/A N
C15 RUM0_PLLT_FB_A J24-3 N/A N
D15 RUM0_PLLC_FB_A J-24-4 N/A N
M1 LLM0_PLLT_IN_A SMA J12 N/A N
M2 LLM0_PLLC_IN_A SMA J14 N/A N
K4 LLM0_PLLT_OUT_A SMA J16 N/A N
K5 LLM0_PLLC_OUT_A SMA J18 N/A N
L5 LLM0_PLLT_FB_A SMA J20 N/A N
M6 LLM0_PLLC_FB_A SMA J22 N/A N
G3 LUM0_PLLT_IN_A SMA J19 N/A N
G2 LUM0_PLLC_IN_A SMA J21 N/A N
E3 LUM0_PLLT_OUT_A SMA J15 N/A N
F4 LUM0_PLLC_OUT_A SMA J17 N/A N
D2 LUM0_PLLT_FB_A SMA J7 N/A N
D3 LUM0_PLLC_FB_A SMA J9 N/A N
A7 PCLKT0_0 OSC R104 N
A8 PCLKC0_0 Test Point N/A N
H16 PCLKT2_0 J24-9 N/A N
J16 PCLKC2_0 J24-10 N/A N
T10 PCLKT4_0 Test Pad N/A N
T11 PCLKC4_0 Test Pad N/A N
K1 PCLKT6_0 SMA J8 N/A N
K2 PCLKC6_0 SMA J10 N/A N
1. Check the schematic pages for termination resistors connected to these pins.
2. 0_ resistor connecting to on-board oscillator.
3. Indicates a non-inverting buffer between the oscillator and pin.