Comtech EF Data SDM-2020 - Manual (Page 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
T
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
t
w
Clock pulse width 4 - nsec
t
su
Setup time, DATA or SYNC to CLOCK 3 - nsec
t
h
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
t
w
Clock pulse width 4 - nsec
t
su
Setup time, DATA, DVALID, or SYNC to CLOCK 3 - nsec
t
h
Hold time, CLOCK to DATA, DVALID or SYNC
invalid 3 - nsec