HI-6120 HOLTIC [Holt Integrated Circuits], HI-6120 Datasheet - Page 29

• Manufacturer Part Number: HI-6120
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

Bit No.
5,4,3
6
2
1
0
Mnemonic R/W
ACTIVE
MCND
MCRD
MCTD
RTAPF
EECKF
RAMIF
R
R
R
R
R
Reset
0
0
0
0
0
Function
Active status.
When set, this read-only bit indicates the terminal is presently processing
a message. This bit reflects the state of output pin ACTIVE and is cleared
on reset. Note: Ths bit and the corresponding output pin are asserted upon
valid command detection and negated when command processing is com-
pleted.
Mode Code Command Type Flags (No-Data, Receive-Data and Transmit-
Data).
These three bits reflect the state of the command stored in the Current
Command Register, 0x0003:
Current Command Type
Subaddress (not mode
code)
Mode code (no data word)
Mode code (receive data)
Mode code (transmit data)
Mode code (undefined, no
data)
RT Address Parity Fail.
This bit is set when Remote Terminal address parity error is present. The bit
is low when correct odd parity applies to the terminal address latched in bits
15-10. This bit is high when parity error is present.
EEPROM Checksum Fail.
This bit only applies when auto-initialization is enabled. While performing
auto-initialization, this bit is set if the checksum tallied from read EEPROM
data doesn’t match the checksum value stored in EEPROM. This failure
also sets bit 1 in the Built-In Test Word Register (0x0014).
RAM Initialization Fail.
This bit only applies when auto-initialization is enabled. While performing
initialization, this bit is set if a write-then-read RAM value doesn’t match its
counterpart location in the serial EEPROM. This failure also sets bit 1 in the
Built-In Test Word Register (0x0014).
HOLT INTEGRATED CIRCUITS
HI-6120, HI-6121
29
MCND
0
1
0
0
1
MCRD
0
0
1
0
1
MCTD
0
0
0
1
1
Current Com-
mand Word
Subaddress,
transmit or
receive
MC0 to MC15,
T/R bit equals 1
MC16 to MC31,
T/R bit equals 0
MC16 to MC31,
T/R bit equals 1
MC0 to MC15,
T/R bit equals 0