Core1553BRT-EBR Enhanced Bit Rate 1553 Remote Terminal
Word Formats
There are only three types of words in a 1553EBR message: a command word (CW), a data word (DW), and a status
word (SW). Each word consists of a 3-bit sync pattern, 16 bits of data, and a parity bit, providing the 20-bit word (see
Figure 4).
Bit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CW
5
1
5
5
1
P
Sync
Sync
RT Address
T/R
Sub-Address
Word Count / Mode Code
DW
SW
16
1
P
Data
5
1
1
1
3
1
1
1
1
1
1
Sync
RT Address
Reserved
Figure 4 • 1553EBR Word Formats
I/O Signal Descriptions
Table 2 • 1553EBR Bus Interface
Port Name
RTADDR[4:0]
RTADDRP
Type
In
Description
Sets the RT address; must not be set at '11111'
In
RT Address parity input. This input should be set high or low to achieve odd parity on the
RTADDR and RTADDRP inputs. If RTADDR is set to '00000', the RTADDRP input should be set
to '1'.
RTADERR
Out
Indicates that the RTADDR and RTADDRP inputs have incorrect parity, or broadcast is enabled
and the RT address is set to 31; when active (high), the RT is disabled and will ignore all
1553EBR traffic.
BUSAINENn
BUSAIN
Out
In
Active low enable for the A receiver
Data input from the A receiver
BUSBINENn
BUSBIN
Out
In
Active low enable for the B receiver
Data input from the B receiver
BUSAOUTEN
BUSAOUT
BUSBOUTEN
BUSBOUT
Out
Out
Out
Out
Active high transmitter enable for the A transmitter
Data output to the Bus A transmitter
Active high transmitter enable for the B transmitter
Data output to the Bus B transmitter
6
Advanced v1.1
ACTEL [ Actel Corporation ]
