UT1553B/BCRTMP-WPA 데이터 시트보기 (PDF) - Aeroflex UTMC

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UT1553B/BCRTMP-WPA

Bus Controller Remote Terminal Multi-Protocol (BCRTMP)

Aeroflex UTMC 

#1 Status Register (Read Only)

These bits indicate the BCRTMP’s current status.

Bit

Number

Description

BIT 15

TEST. This bit reflects the inverse of the TEST output. It changes state simultaneously with theTEST output.

BIT 14

(RT) Remote Terminal Active. Indicates that the BCRTMP, in the Remote Terminal mode, is presently servicing

a command. This bit reflects the inverse of the COMSTR pin.

BIT 13

(RT) Dynamic Bus Control Acceptance. This bit reflects the state of the Dynamic Bus Control Acceptancebit

in the RT status word (see Register 10 on page 20).

BIT 12

(RT) Terminal Flag bit is set in RT status word. See also section 8.2.8.10.

BIT 11

(RT) Service Request bit is set in RT status word. See also section 8.2.8.4.

BIT 10

(RT) Busy bit is set in RT status word. See also section 8.2.8.7.

BIT 9

BIT is in progress.

BIT 8

Reset is in progress. This bit indicates that either a write to Register 12 has just occurred or the BCRTMP has

just received a Reset Remote Terminal (#01000) Mode Code. This bit remains set less than 1ms.

BIT 7

BC/(RT) Mode. Indicates the current mode of operation. A reset operation must be performed when changing

between BC and RT modes.

BIT 6

Channel A/B. Indicates either the channel presently in use or the last channel used.

BIT 5

Subsystem Fail Indicator. Indicates receiving a subsystem fail signal from the host subsystem on the

SSYSF input.

BITs 4-1

Reserved.

BIT 0

(BC) Command Block Execution is in progress. (RT) Remote Terminal is in operation. This bit reflects bit 0 of

Register 0.

#2 Current Command Block Register (BC)/Remote Terminal Descriptor Space Address Register (RT)

(BC) This register contains the address of the head pointer of the Command Block being executed. Accessing a new Command

Block updates it.

(RT) The host CPU initializes this register to indicate the starting location of the RT Descriptor Space. The host must allocate

320 sequential locations following this starting address. For proper operation, this location must start on an I x 512 decimal

address boundary, where I is an integer multiple.

#3 Polling Compare Register

In the polling mode, the CPU sets the Polling Compare Register to indicate the RT response word on which the BCRTMP

should interrupt. This register is 11 bits wide, corresponding to bit times 9 through 19 of the RT’s 1553 status word response.

The sync, Remote Terminal Address, and parity bits are not included (see the section on Polling, page 38).

#4 BIT (Built-In-Test) Word Register

The BCRTMP uses the contents of this register when it responds to the Transmit BIT Word Mode Code (#10011). In addition,

the BCRTMP writes to the two most significant bits of the BIT Word Register in response to either an Initiate Self-Test Mode

Code (RT mode) or a write to Register 11 (BIT Start Command) to indicate a BIT failure. If the BIT Word needs to be modified,

it can be read out, modified, then rewritten to this register. Note that if the processor writes a “1” to either bit 14 or 15 of this

register, it effectively induces a BIT failure. Also note that during normal RT operation, bits 10 through 13 of this register

indicate specific types of message errors, as shown below.

Bit

Number

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BITs 9-0

Description

Channel B failure.

Channel A failure.

Word Count Error.

Parity Error.

Manchester Error.

Remote Terminal Time-Out.

BIT Word. The least significant ten bits of the BIT Word are user programmable.

BCRTMP-18

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