Comtech EF Data SDM-2020 - Manual (Page 132)

SDM-2020 Satellite Modulator Revision 7
ECL/HSSI TX MN/SDM2020M.IOM
10-11
The timing parameters for the serial data transmit interface are listed in
Table 10-6, and the timing parameters for the serial data receive interface
are listed in Table 10-7.
Table 10-6. 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
Table 10-7. 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
10.1.4.7 T
ERRESTRIAL
TX C
LOCK
P
HASE
The ECL/HSSI interface supports TX clock phase inversion. Terrestrial data is sampled
on the falling edge of TT clock in normal phase selection. In inverted phase selection, the
terrestrial data is sampled on the rising edge of TT clock.
10.1.4.8 T
ERRESTRIAL
RX C
LOCK
P
HASE
The ECL/HSSI interface supports RX clock phase inversion. Terrestrial data (SD) is
synchronous to RT. In normal mode, the falling edge of the RT clock is centered on the
SD signal. In inverted phase selection, the rising edge of RT clock is centered on the SD
signal.