HI-6120_15 Datasheet, PDF (12/162 Pages) Holt Integrated Circuits – MIL-STD-1553 Remote Terminal ICs

HI-6120, HI-6121
Pin
READY
ACTIVE
MCLK
TTCLK
SSYSF
ECS
ESCK
MISO
MOSI
BUSA, BUSA
BUSB, BUSB
VCC, VCCP
GND
TEST
TEST7:0
MODE
COMP
Function
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
ANALOG
ANALOG
POWER
POWER
INPUT
BI-DIR
INPUT
INPUT
Description
Pin is low when auto-initialization or built-in test is in-process. The host must not
access shared RAM or device registers when pin state is low. When output
is high, the shared RAM and registers may be configured, and device will begin
terminal execution when the STEX (start execution) bit in Configuration Register 1
is set.
Pin is high when the HI-6120 / HI-6121 is actively processing a valid MIL-
STD-1553 command, otherwise low. The falling edge signifies message
completion.
Master clock input, 50.0 MHz ±0.01% (100ppm). Internal 50kΩ pull-down resistor.
Time-Tag Clock input. Internal 50kΩ pull-down resistor.When Configuration
Register 1 bits TTCK2:0 = 001, this pin is the clock input for the Time Tag counter.
For other values of TTCK2:0, the Time-Tag counter is internally clocked so the
TTCLK pin is not used.
Subsystem fail input, active high. Internal 50kΩ pull-down resistor. When this input
is high, the HI-6120 / HI-6121 terminal sets the SUBSYS flag in its status word.
Chip select output for the dedicated Serial Peripheral Interface (SPI) that con-
nects to the optional external serial EEPROM used for automatic self-initialization.
For this auto-initialization SPI, the device operates in SPI master mode while the
external memory operates in slave mode. This SPI is separate from the host SPI
found in the HI-6121.
Serial Clock output signal for the dedicated auto-initialization SPI connected to
external auto-initialization EEPROM.
Serial Input signal (Master-In Slave-Out) for the dedicated auto-initialization
SPI connected to external auto-initialization EEPROM. Internal 50kΩ pull-down
resistor.
Serial Output signal (Master-Out Slave-In) for the dedicated auto-initialization SPI
connected to external auto-initialization EEPROM.
Bi-directional analog interface to MIL-STD-1553 bus A isolation transformer,
positive and negative signals respectively.
Bi-directional analog interface to MIL-STD-1553 bus B isolation transformer,
positive and negative signals respectively.
3.3V supply voltage inputs for logic and transceiver circuits.
Ground pin for logic and transceiver circuits.
Test enable.Internal 50kΩ pull-down resistor.The host asserts this pin to per-
form RAM self-test or loopback tests.
Test pins used for factory testing.Internal 50kΩ pull-down resistor.Do not
connect these pins.
Test pin used for factory testing.Internal 50kΩ pull-up resistor.Do not connect
this pin.
Test pin used for factory testing.Internal 50kΩ pull-down resistor.Do not connect
this pin.
HOLT INTEGRATED CIRCUITS
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