5962F8957701XA View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

5962F8957701XA

BCRTM

Aeroflex UTMC 

RT

RT

RT

RESPONSE

Q?

BC

POLLING RESPONSE REGISTER

(RT STATUS WORD)

POLLING COMPARE WORD

(SET BY CPU)

Figure 16. Polling Operation

7.4 Bus Controller Operational Sequence

The following is a general description of the typical

behavior of the BCRTM as it processes a message in the

BC mode.

The user starts BC operation by writing a “1” to Register

0, Bit 0.

• Command Block DMA - the following occurs

immediately after Bus Controller startup:

DMA arbitration (BURST)

Control Word read

Command Word 1 read (from third location

of Command Block)

Data List Pointer read

A. For BC-to-RT Command Blocks:

The BCRTM transmits the Command Word.

• Data Word DMA

DMA arbitration

Data Word read (starting at Data List Pointer

address, incremented for each successive

word)

The BCRTM transmits the Data Word. Data Word DMAs

and transmissions continue until all Data Words are

transmitted.

• Status Word DMA

The BCRTM receives the RT Status Word.

DMA arbitration

Status Word write (to sixth location of

Command Block)

B. For RT-to-BC Command Blocks:

The BCRTM transmits the Command Word.

• Status Word DMA

The BCRTM receives the RT Status Word.

DMA arbitration

Status Word write (to sixth location of

Command Block)

The BCRTM receives the first Data Word.

• Data Word DMA

DMA arbitration

Data Word write (starting at Data List

Pointer address, incremented for each

successive word)

Data Word receptions and DMAs continue until all Data

Words are received.

C. For RT(A)-to-RT(B) Command Blocks:

The BCRTM transmits Command Word 1 to RT(B).

• Command Word 2 DMA

DMA arbitration

Command Word 2 read (from fourth location

of Command Block)

The BCRTM transmits Command Word 2 to RT(A).

The BCRTM receives the RT Status Word from RT(A).

• Status Word DMA for RT(A) Status Word

DMA arbitration

Status Word write (to sixth location of

Command Block)

The BCRTM receives the first Data Word

• Data Word DMA (only if the BCRTM is enabled to

monitor the RT-to-RT message).

DMA arbitration

Data Word write (starting at Data List Pointer

address, incremented for each successive

word)

Data Word receptions and DMAs continue until all Data

Words are received.

The BCRTM receives the RT Status Word from RT(B).

• Status Word DMA for RT(B) Status Word

DMA arbitration

Status Word write (to seventh location of

Command Block)

BCRTM-32

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