41
Data Device Corporation
www.ddc-web.com
BU-64703
D-03/06-0
DESCRIPTION
Transmitter inhibit input for the MIL-STD-1553 transmitters. For normal operation, this input should be connected to logic
"0". To force a shutdown of the Channel A and Channel B transmitters, a value of logic "1" should be applied to this input.
TX_INH (I)
65
Broadcast Enable. If this input is logic "1", the SSRT Mark3 will recognize RT address 31 as the broadcast address. If this
input is logic "0", the SSRT Mark3 will not recognize RT address 31 as the broadcast address; however, in this configura-
tion, RT address 31 may be used as a standard RT address.
BRO_ENA (I)
71
Auto-configure input. If connected to logic "1", then the auto-configure option is disabled, and the six configuration para-
meters revert to their default values as listed in TABLE 2. Note that the default condition for each configuration parameter
is enabled (for the MIL-STD-1553A/B protocol selection, -1553B is the default).
If AUTO_CFG is connected to logic "0", then the configuration parameters are transferred over D5-D0 during a DMA read
data transfer, when RTACTIVE and DTACK are logic "0", following MSTCLR transitioning from logic "0" to logic "1". Each
of the configuration parameters is enabled if the SSRT Mark3 reads a value of logic "1" for the respective data bit.
AUTO_CFG (I)
76
Master Clear. Negative true Reset input, asserted low following power turn-on. When coming out of a “reset” condition,
note that the risetime of MSTCLR must be less than 10 s.
MSTCLR (I)
25
SIGNAL
TABLE 15. CONTROL INPUTS
PIN
DESCRIPTION
SIGNAL
TABLE 16. CLOCK INPUT
Clock Input. The clock frequency must be designated by means of the CLK_SEL_1 and CLK_SEL_0 inputs.
CLK_IN (I)
26
PIN
These two inputs are used to designate the SSRT Mark3's clock frequency, as follows:
CLK_SEL_1
CLK_SEL_0
Clock Frequency
0
10 MHz
0
1
20 MHz
1
0
12 MHz
1
16 MHz
CLK_SEL_1 (I)
73
CLK_SEL_0 (I)
80
DESCRIPTION
SIGNAL
TABLE 17. FACTORY TEST (NO USER CONNECTIONS)
NC
4
PIN
For factory test only. Do not connect for normal operation.
8
9
16
11
21
23