HI-6121PQMF HOLTIC [Holt Integrated Circuits], HI-6121PQMF Datasheet - Page 15

• Manufacturer Part Number: HI-6121PQMF
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

REGISTERS, Cont.
5-3
2
1
0
CURRENT COMMAND REGISTER
This 16-bit register is Read-Only and is fully maintained by the device. This register is cleared after
not affected by SRST software reset.
Bit No.
15-0
CURRENT CONTROL WORD ADDRESS REGISTER
This 16-bit register is Read-Only and is fully maintained by the device. This register is cleared after
not affected by SRST software reset.
Bit No.
15-0
MSB
MSB
15 14 13 12 11 10 9
15 14 13 12 11 10 9
C
A
C
A
MCND
MCRD
MCTD
RTAPF
EECKF
RAMIF
Mnemonic Function
CC15:0
CURRENT CONTROL WORD ADDRESS 15:0
Mnemonic Function
CCW15:0
C
A
C
A
C
A
CURRENT COMMAND 15:0
C
A
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)
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:
RTAddress 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).
Current Command Word.
This register contains the last valid command received over either MIL-STD-1553 bus. This register
is updated 5us after the ACTIVE output is asserted. Bit 15 is MSB.
Current Control Word Address Register
This register contains the address for the descriptor table Control Word corresponding to the current
command stored in the Current Command Register (0x0003). This register is updated 5us after the
ACTIVE output is asserted. Bit 15 is MSB. Also see “Current Message Information Word Address”
register, 0x000A.
C
A
C
A
8
8
C
A
7
7
C
A
6
6
C
A
5
5
C
A
4
4
HOLT INTEGRATED CIRCUITS
(0x0003)
C
A
3
3
.
C
A
2
2
HI-6120, HI-6121
C
A
1
1
C
A
0
0
MCND
LSB
LSB
0
1
0
0
1
15
MCRD
(0x0004)
0
0
1
0
1
MCTD
0
0
0
1
1
Current Command Word
Subaddress, transmit or receive
MC0 to MC15, T/ bit equals 1
MC16 to MC31, T/ bit equals 0
MC16 to MC31, T/ bit equals 1
MC0 to MC15, T/ bit equals 0
MR
MR
pin master reset, but is
pin master reset, but is
R
R
R
R