5962H8957701VXC View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

5962H8957701VXC

BCRTM

Aeroflex UTMC 

3.0 INTERNAL REGISTERS

The BCRTM’s internal registers (see table 1 on pages 18-

19) enable the CPU to control the actions of the BCRTM

while maintaining low DMA overhead by the BCRTM. All

functions are active high and ignored when low unless stated

otherwise. Functions and parameters are used in both RT

and BC modes except where indicated. Registers are

addressed by the binary equivalent of their decimal number.

For example, Register 1 is addressed as 0001B. Register

usage is defined as follows:

#0 Control Register

Bit

Number

Description

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BITs 6-5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Reserved.

Rt Address 31. When RT31=0, the BCRTM recognizes RT Address 31 as a Broadcast command. When

RT31=1,the BCRTM treats RT Address 31 as a normal terminal address.

Subaddress 31. When SA31=0, the BCRTM recognizes a command word with either subaddress 0 or 31 as being

a valid code. When SA31=1, the BCRTM only recognizes a command word with a subaddress of 0 as a valid

mode code.

Bus Controller Time out. When the BCRTM is a BC and BCTO=0, the BCRTM allows an RT up to 16us to

respond with a status word before it declares a bus time-out. If BCTO=1, the BCRTM allows an RT up to 32us to

respond with a status word before it declares a bus time-out. In the remote terminal mode of operation, this bit

controls to RT to RT response time-out. To support the requirements of MIL-STD-1553B, this bit is set to a

logical zero.

Enable External Override. For use in multi-redundant systems. This bit enables the EXTOVR pin.

BC/RT Select. This function selects between the Bus Controller and Remote Terminal/Monitor operation

modes. It overrides the external BCRTSEL input setting if the Change Lock-Out function is not used. A reset

operation must be performed when changing between BC and RT/M modes. For monitor operation this bit

must be "0". This bit is write-only.

(BC) Retry on Alternate Bus. This bit enables an automatic retry to operate on alternate buses. For example, if

on bus A, with two automatic retries programmed, the automatic retries occur on bus B.

(RT,M) Channel B Enable. When set, this bit enables Channel B operation.

(BC) No significance.

(RT,M) Channel A Enable. When set, this bit enables Channel A operation.

(BC) Channel Select A/B. When set, this bit selects Channel A.

(BC) Retry Count. These bits program the number (1-4) of retries to attempt. (00 = 1 retry, 11 = 4 retries)

(BC) Retry on Bus Controller Message Error. This bit enables automatic retries on an error the Bus Controller

detects (see the Bus Controller Architecture section, page 29).

(BC) Retry on Time-Out. This bit enables an automatic retry on a response time-out condition.

(BC) Retry on Message Error. This bit enables an automatic retry when the Message Error bit is set in the RT’s

status word response.

(BC) Retry on Busy. This bit enables automatic retry on a received Busy bit in an RT status word response.

Start Enable. In the BC mode, this bit starts/restarts Command Block execution. In the RT or M mode,

It enables the BCRTM to receive a valid command. RT operation does not start until a valid command is

received. When using this function:

• Restart the BCRTM after each Master Reset or programmed reset.

• This bit is not readable; verify operation by reading bit 0 of the BCRTM’s Status Register.

BCRTM-12

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