HI-1575PCM datasheet(6/12 Pages) HOLTIC

Part #	HI-1575PCM

Description	3.3V Dual Transceivers with Integrated Encoder / Decoders

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Manufacturer	HOLTIC [Holt Integrated Circuits]

Direct Link	http://www.holtic.com

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HOLT INTEGRATED CIRCUITS

6

55 Ohms

CHA/CHB

CLK

STRB

D15:D0

R/W

REG

BUSA

MIL-STD-1553

BUS B

(Transformer Coupled)

1:2.5

52.5 Ohms

RCVA

GND

BUSB

1:2.5

1:1.4

MIL-STD-1553

BUS A

(Direct Coupled)

3.3 V

VDD

HI-1575

55 Ohms

52.5 Ohms

Host CPU

12.0 MHz

MIL-STD-1553 BUS CONNECTION

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

The host reads the received word from the HI-1575 RXA or

RXB register. The data word is read by pulsing

low,

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

last word received on each bus.

SAM bits 2 or 3 (RENA, RENB) can be used to

independently enable or disable each receiver. Writing a

'1' to RENA enables receiver A. A '0' disables the receiver.

RENB performs the same function for the MIL-STD-1553

bus B.

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

data transmitted to the MIL-STD-1553 data bus.

STRB

W

FIGURE 7. MIL-STD-1553 WORD FORMATS

12

3

4

567

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

DATA WORD

TERMINAL ADDRESS

ME

CODE FOR FAILURE MODES

TERMINAL ADDRESS

SYNC

TF

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