HOLT INTEGRATED CIRCUITS

3

FUNCTIONAL DESCRIPTION

HI-6110

HOST INTERFACE

The Holt HI-6110 provides a simple interface between a host

subsystem and a MIL-STD-1553 dual redundant data bus.

Messages are processed one at a time. The HI-6110

automatically handles message formatting, error checking,

message data buffering, protocol checking and default

responses. The host may override default message responses by

updating registers on-the-fly.

The host communicates with the HI-6110 using a 16-bit

bidirectional data bus. On-chip bus transceivers allow the device

to be connected to the MIL-STD-1553 data buses using external

coupling transformers.

The HI-6110 can be configured as 1553 Bus Controller (BC),

Remote Terminal (RT) or Bus Monitor (MT). The BCMODE and

RTMODE inputs define the mode of operation as follows:

BCMODE RTMODE

1553 OPERATING MODE

1

0

Bus Controller (BC)

0

1

Remote Terminal (RT)

1

1

Bus Monitor (no assigned RT address)

0

0

Bus Monitor with assigned RT address

The HI-6110 is further configured by setting various configuration

bits in the on-chip Control Register. Different sets of 16-bit

registers and message data FIFOs are available depending upon

the mode of operation (BC, RT or MT). The

pin is used as the

timing signal for data read and write cycles. Data is output on the

16-bit bidirectional data bus, D15-D0, when R/

is high and

is low. D15-D0 are inputs when R/

is low, and data is written into

internal registers on the rising edge of the

signal. The Chip

Select input

must be low for all register read / write operations:

STR

W

STR

W

STR

CS

R/

D15-D0

OPERATION

1

X

X

High impedance

No operation

0

X

1

High impedance

No operation

0

1

0

Output

Read

0

0

0

Input

Write (on

rising edge)

Four Register address inputs (RA3, RA2, RA1, RA0) are used to

select internal registers during host read or write operations. Note

that internal registers may be write-only, read-only or read/write.

The register address map is different for BC, RT and MT modes

as not all registers are used in each mode. Table 1 defines the HI-

6110 address map in detail.

CS

W STR

STR

REGISTER READ (R/

=1)

RT-RT,

RECEIVED STATUS WORD (from last RT-RT)

RA3:0

BC

RT or MT with assigned RT address

MT without assigned RT address

W

ADDRESS

MODE

RA3:0

BC

RT or MT with assigned RT address

MT without assigned RT address

0000

STATUS WORD 1 ( if

Receive RT ) COMMAND WORD 1

COMMAND WORD 1

0001

STATUS WORD 2 only RT-RT Transmit RT COMMAND WORD 2 (from last RT-RT)

COMMAND WORD 2 (from last RT-RT)

0010

-

RECEIVED MODE DATA WORD

RECEIVED MODE DATA WORD

0011

-

Xmitting RT STATUS WORD for RTRT

0100

RECEIVED DATA FIFO

RECEIVED DATA FIFO

DATA FIFO, includes Xmitted Mode Data

0101

STATUS REGISTER

STATUS REGISTER

STATUS REGISTER

0110

-

MESSAGE REGISTER

MESSAGE REGISTER

0111

ERROR REGISTER

ERROR REGISTER

ERROR REGISTER

1000

-

-

STATUS WORD (Receiving RT if RTRT)

1001

BUS A WORD

BUS A WORD

BUS A WORD

1010

BUS B WORD

BUS B WORD

BUS B WORD

1100

CONTROL REGISTER

CONTROL REGISTER

CONTROL REGISTER

REGISTER WRITE (R/

=0)

ADDRESS

MODE

X 0 0 0

COMMAND WORD 1

TRANSMIT STATUS WORD

X 0 0 1

COMMAND WORD 2 ( used for RT-RT only)

TRANSMIT MODE DATA WORD

-

X 0 1 0

TRANSMIT DATA FIFO

RESET TRANSMIT DATA FIFO

-

X 0 1 1

-

TRANSMIT DATA FIFO

-

X 1 X X

CONTROL REGISTER

CONTROL REGISTER

CONTROL REGISTER

W

Table 1. HI-6110 Internal Register Address Map

Table 2. MIL-STD-1553 Word Type Decoding

SIGNALS RF1 AND RF0 IDENTIFY LAST RECEIVED 1553 WORD TYPE

SIGNAL

MODE

RF1 RF0

BC

00

-

-

-

0

1

pulses low if

Valid Receive Command Bus A

Valid Receive Command Bus A

1

0

-

Valid Receive Command Bus B

Valid Receive Command Bus B

h

reading

BUS A WORD or BUS B WORD registers sync type for the stored word can be determined from the RF0 and RF1 outputs.

RT or MT with assigned RT address

MT without assigned RT address

STATUS WORD 2

W ile

the

,

While the /STR input is held low, output RF1 = 1 if the stored Bus Word had Command Sync, or output RF0 = 1 if the stored Bus Word had Data Sync.