4 clocks, 5 pcb layout details – Sundance SMT123-SHB User Manual
Page 10
User Guide SMT123-SHB
Page 10 of 13
11/06/2004
4 CLOCKs
The board contains two crystals to allow data transfer through the fibre module and/or the
SHB connector to other boards. The fibre module operates at 53.125MHz (half speed) or
106.25 MHZ (full speed). This corresponds to the REF signal mentioned in section 2 of this
document. There are 3 resistors that play a key role to achieve proper operation of the
VSC7146 according to the value of this crystal (X1 on the component side):
Resistor
Speed
Position
HALF 0
R19
FULL 1
HALF 0
R20
FULL 1
HALF 1
R25
FULL 0
The SHB interface is usually clocked at 50 or 100 MHz (X2 on the bottom of the board) and it
is connected to the FPGA pin A8.
5 PCB Layout Details
5.1 Component
Side
Figure 5 – PCB Layout, Top
- SMT107 (16 pages)
- SMT6035 v.2.2 (39 pages)
- SMT6012 v.4.6 (22 pages)
- FC100 (12 pages)
- FC108 v.1.1 (10 pages)
- SMT6065 v.4.0 (45 pages)
- FFT v.2.1 (19 pages)
- SMT111 (18 pages)
- SMT118LT (10 pages)
- SMT118 (20 pages)
- SMT128 (15 pages)
- SMT145 (18 pages)
- SMT148 (35 pages)
- SMT130 v.1.0 (46 pages)
- SMT148FX (48 pages)
- SMT310Q (55 pages)
- PARS (70 pages)
- SMT166-FMC (52 pages)
- SMT166 (44 pages)
- SMT300Q v.1.6 (61 pages)
- SMT310 v.1.6 (50 pages)
- SMT317 (24 pages)
- SMT326v2 (24 pages)
- SMT338 (19 pages)
- SMT349 (32 pages)
- SMT339 v.1.3 (27 pages)
- SMT338-VP (22 pages)
- SMT358 (25 pages)
- SMT351T (37 pages)
- SMT351 (25 pages)
- SMT350 (45 pages)
- SMT362 (30 pages)
- SMT365G (23 pages)
- SMT364 (37 pages)
- SMT373 (15 pages)
- SMT368 (24 pages)
- SMT370v3 (46 pages)
- SMT377 (22 pages)
- SMT381 2007 (31 pages)
- SMT381-VP (81 pages)
- SMT387 (42 pages)
- SMT391 (18 pages)
- SMT384 (47 pages)
- SMT390-VP (55 pages)