HI-6120 HOLTIC [Holt Integrated Circuits], HI-6120 Datasheet - Page 27

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

Bit No.
8,7
4-0
9
6
5
Mnemonic
MCOPT4
(continued)
MCOPT3:2 R/W
MCOPT1
MCOPT0
-----
R/W Reset Function
R/W
R/W
R/W
R/W
0
0
0
0
0
Mode Code Options 3 and 2.
If both of these bits equal one, the data word received with a valid “synchro-
nize” mode command (MC17) is unconditionally loaded into the Time-Tag
counter. For non-broadcast MC17 commands, the counter load occurs be-
fore status word transmission. If both of these bits equal 0, the external host
assumes responsibility for actions needed to perform “synchronize” duties
upon reception of the valid MC17 “synchronize”mode code command, but
status transmission automatically occurs.
The binary 01 and 10 combinations of the MCOPT3 and MCOPT2 bits sup-
port certain extended subaddressing schemes. If the MCOPT3-MCOPT2
bits equal 01, the received data word is automatically loaded into the Time-
Tag counter if bit 0 of the received data word equals 0. If the MCOPT3-
MCOPT2 bits equal 10, the received data word is automatically loaded into
the Time-Tag counter if bit 0 of the received data word equals 1. For
non-broadcast MC17 commands, the counter load occurs before status word
transmission.
Mode Code Option 1.
If this bit is logic 0, reception of a “transmit vector word” mode command
(MC16) causes automatic reset of the Service Request status bit. The Ser-
vice Request bit is reset in the Status Word Bits register before status word
transmission begins. If the MCOPT1 bit is logic 1, the external host assumes
responsibility for resetting the Service Request bit in the Status Word Bits
register.
Mode Code Option 0.
If this bit is logic 0, reception of a “reset remote terminal” mode command
(MC8) causes automatic assertion of SRST software reset. If non-broadcast
mode command, reset occurs after status word transmission is complete. If
this bit is logic 1, the external host assumes responsibility for actions needed
to perform terminal reset.
Not Used
MC20 (or MC21)
MC20 (or MC21)
does NOT match
value matches
if mode data
“Bus Select”
if mode data
“Bus Select”
HOLT INTEGRATED CIRCUITS
value
value
HI-6120, HI-6121
The MCOPT4 bit in Configuration Register 2 is logic 1
27
Inactive Bus Tx & Rx
Inactive Bus Tx & Rx
status NOT changed
BUSINH bit in Con-
status not changed
(Host can modify
figuration Reg 1)
Status Word
Status Word
transmitted,
transmitted,
broadcast
broadcast
unless
unless
& RXSD bits are
& RXSD bits are
Register, TXSD
Register, TXSD
In BIT Word
In BIT Word
static
static