There are no specific layout guidelines for the DMD as typically DMD is connected using a board or board-to-board connector to a flex cable. For detailed layout guidelines refer to the layout design files. Some layout guideline for the flex
cable interface with DMD are:
- Match lengths for the LS_WDATA and LS_CLK signals.
- Minimize vias, layer changes, and turns for the HS bus signals. Refer Figure 10-1.
- Minimum of 100-nF decoupling capacitor close to VBIAS. Capacitor C4 in Figure 10-2.
- Minimum of 100-nF decoupling capacitor close to VRESET. Capacitor C6 in Figure 10-2.
- Minimum of 220-nF decoupling capacitor close to VOFFSET. Capacitor C7 in Figure 10-2.
- Optional minimum 200- to 220-nF decoupling capacitor to meet the ripple requirements of the DMD. C5 in Figure 10-2.
- Minimum of 100-nF decoupling capacitor close to VCCI. Capacitor C1 in Figure 10-2.
- Minimum of 100-nF decoupling capacitor close to both groups of VCC pins, for a total of 200 nF for VCC. Capacitor C2/C3 in Figure 10-2.