Comtech-ef-data SDM-2020 Bedienungsanleitung PDF herunterladen (Seite 163)

SDM-2020 Satellite Demodulator Revision 4

ECL/HSSI Data Interface MN/SDM2020D.IOM

10–11

Use the timing diagram shown in Figure 10-8 for the worst case interface timing

specifications.

CLOCK

DATA

tsu th tw

SYNC

DVALID

Figure 10-8. Interface Timing

The timing parameters for the serial data transmit interface are listed in Table 10-7.

Table 10-7. Transmit Timing Parameters

Parameter Description Min Max Units

f Operating frequency (1/T) 1.5 100 MHz

T Clock period (1/f) 10 666 nsec

Clock pulse width 4 - nsec

Setup time, DATA or SYNC to CLOCK 3 - nsec

Hold time, CLOCK to DATA or SYNC invalid 3 - Nsec

The timing parameters for the serial data receive interface are listed in Table 10-8.

Table 10-8. Receive Timing Parameters

Parameter Description Min Max Units

f Operating frequency (1/T) 1.5 100 MHz

T Clock period (T) 10 666 nsec

Clock pulse width 4 - nsec

Setup time, DATA, DVALID, or SYNC to CLOCK 3 - nsec

Hold time, CLOCK to DATA, DVALID or SYNC

invalid

3 - nsec

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Comtech-ef-data SDM-2020 Bedienungsanleitung Seite 163