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HOLT INTEGRATED CIRCUITS
6
55 Ohms
CHA/CHB
CLK
STRB
D15:D0
R/W
REG
BUSA
BUSA
MIL-STD-1553
BUS B
(Transformer Coupled)
1:2.5
52.5 Ohms
RCVA
GND
BUSB
BUSB
1:2.5
1:1.4
MIL-STD-1553
BUS A
(Direct Coupled)
3.3 V
VDD
HI-1575
HI-1575
55 Ohms
52.5 Ohms
Host CPU
12.0 MHz
MIL-STD-1553BUSCONNECTION
The HI-1575 includes on-chip MIL-STD-1553 analog
transceivers which are designed to drive the primary
winding of a 1:2.5 turns-ratio MIL-STD-1553 isolation
transformer. Figure 6 shows how the HI-1575 may be
connected to the MIL-STD-1553 data bus as either a
direct coupled stub (Bus A example), or a transformer
coupled stub (Bus B example). Holt Integrated Circuits
offers a wide range of single-core and dual-core coupling
transformers suitable for use with the HI-1575.
FIGURE 6. MIL-STD-1553 BUS CONNECTION
RCVB
MR
ERROR
SYNC
ThehostreadsthereceivedwordfromtheHI-1575RXAor
RXB register. The data word is read by pulsing
while R/
is high and REG is low. Figure 4 shows an
example receive operation. The SYNC output indicates
whether the word had a Command Sync (SYNC=1) or
Data Sync (SYNC=0). SAM register bits 8 and 12
(RSYNCA and RSYNCB) retain the Sync values for the
lastwordreceivedoneachbus.
low,
SAM bits 2 or 3 (RENA, RENB) can be used to
independently enable or disable each receiver. Writing a
'1' to RENAenables receiverA.A'0' disables the receiver.
RENB performs the same function for the MIL-STD-1553
busB.
Note that because each receiver is internally connected to
its transmitter, when a MIL-STD-1553 word is transmitted
by the HI-1575 it will also be received on the same
channel. This feature allows the terminal to self-monitor
datatransmittedtotheMIL-STD-1553databus.
STRB
W
FIGURE 7. MIL-STD-1553 WORD FORMATS
1
2
3
4
5
6
7
8
9
10
11
13
12
14
15
16
17
18
19
20
Bit Period
Command Word
Data Word
Status Word
R/T
SUBADDRESS
/ MODE
DATA WORD
COUNT
P
P
P
DATA WORD
TERMINALADDRESS
ME
CODE FOR FAILURE MODES
TERMINALADDRESS
SYNC
SYNC
SYNC
SYNC
SYNC
SYNC
TF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HI-1575PQM | 3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQMF | 3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQT | 3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQTF | 3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-200883 | Dual SPST CMOS Analog Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HI-1575PQM | 制造商:HOLTIC 制造商全稱:Holt Integrated Circuits 功能描述:3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQMF | 制造商:HOLTIC 制造商全稱:Holt Integrated Circuits 功能描述:3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQT | 制造商:HOLTIC 制造商全稱:Holt Integrated Circuits 功能描述:3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1575PQTF | 制造商:HOLTIC 制造商全稱:Holt Integrated Circuits 功能描述:3.3V Dual Transceivers with Integrated Encoder / Decoders |
| HI-1579_13 | 制造商:HOLTIC 制造商全稱:Holt Integrated Circuits 功能描述:MIL-STD-1553 / 1760 3.3V Monolithic Dual Transceivers |
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