UT1553B_ Ver la hoja de datos (PDF) - Aeroflex UTMC

Número de pieza

componentes Descripción

Fabricante

UT1553B_

RTR Remote Terminal with RAM

Aeroflex UTMC 

MESSAGE INDEX

MESSAGE DATA ADDRESSES

15 (MSB)

10

9

Message index: Defines the

maximum messages buffered for

the given subaddresses.

0 (LSB)

Message Data Address:

Indicates the starting memory address for incoming

message storage.

Figure 3. Message Pointer Structure

1.2 RTR RAM Pointer Structure

The RAM 16-bit pointers have a 6-bit index field and a

10-bit address field. The 6-bit index field allows for the

storage of up to 64 messages per subaddress. A message

consists of the 1553 command word and its associated data

words.

The 16-bit pointer for Transmit Last Command Mode Code

is located at memory location 3E0 (hex). The Transmit Last

Command Mode Code pointer buffers up to 63 command

words. An example of command word storage follows:

Example:

3E0 (hex)

Contents = FC00 (hex)

11 1111 00 0000 0000

Address Field = 000 (hex)

Index Field = 3F (hex)

First command word storage location (3E0=F801):

Address Field = 001 (hex)

Index Field = 3E (hex)

Sixty-third command word storage location (3E0=003F):

Address Field = 03F (hex)

Index Field = 00 (hex)

Sixty-fourth command word storage location (3E0=003F)

(previous command word overwritten):

Address Field = 03F (hex)

Index Field = 00 (hex)

The Transmit Last Command Mode Code has Address Field

boundary conditions for the location of command word

buffers. The host can allocate a maximum 63 sequential

locations following the Address Field starting address. For

proper operation, the Address Field must start on an I x 40

(hex) address boundary, where I is greater than or equal to

zero and less than or equal to 14. A list of valid Index and

Address Fields follows:

I Valid Index Fields

0 3F (hex) to 00 (hex)

1 3F (hex) to 00 (hex)

2 3F (hex) to 00 (hex)

3 3F (hex) to 00 (hex)

4 3F (hex) to 00 (hex)

5 3F (hex) to 00 (hex)

6 3F (hex) to 00 (hex)

7 3F (hex) to 00 (hex)

8 3F (hex) to 00 (hex)

9 3F (hex) to 00 (hex)

10 3F (hex) to 00 (hex)

11 3F (hex) to 00 (hex)

12 3F (hex) to 00 (hex)

13 3F (hex) to 00 (hex)

14 3F (hex) to 00 (hex)

Valid Address Fields

000 (hex) to 03F (hex)

040 (hex) to 07F (hex)

080 (hex) to 0BF (hex)

0C0 (hex) to 0FF (hex)

100 (hex) to 13F (hex)

140 (hex) to 17F (hex)

180 (hex) to 1BF (hex)

1C0 (hex) to 1FF (hex)

200 (hex) to 23F (hex)

240 (hex) to 27F (hex)

280 (hex) to 2BF (hex)

2C0 (hex) to 2FF (hex

300 (hex) to 33F (hex)

340 (hex) to 37F (hex)

380 (hex) to 3BF (hex)

RTR-4

Share Link: