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参数资料
| 型号： | BU-64703B8-302 |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CBGA80 |
| 封装： | CERAMIC, BGA-80 |
| 文件页数： | 24/48页 |
| 文件大小： | 405K |
| 代理商： | BU-64703B8-302 |
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30
Data Device Corporation
www.ddc-web.com
BU-64703
D-03/06-0
BIT WORD
The SSRT Mark3 provides an internally formulated Built-In-Test
word (BIT word). This word is transmitted to the BC in response
If set, indicates that, for the previous message, the SSRT Mark3 was the receiving RT for an RT-to-RT
transfer and that the transmitting RT either did not respond or responded later than the SSRT Mark3
RT-to-RT timeout time. The SSRT Mark3's RT-to-RT response timeout time is defined as the time from
the mid-bit crossing of the parity bit of the transmit Command Word to the mid-sync crossing of the
transmitting RT status word. The value of the SSRT Mark3's RT-to-RT response timeout time is in the
range from 17.5 to 19.5 s.
Indicates that a received command word is not defined in accordance with MIL-STD-1553B. This
includes the following undefined Command Words: (1) The Command Word is a non-mode code,
broadcast, transmit command; (2) a message with a T/R bit of "0", a subaddress/mode field of 00000
or 11111, and a mode code field with a value between 00000 and 01111; (3) a mode code command
that is not permitted to be broadcast (e.g., Transmit Status) is sent to the broadcast address 11111.
Indicates that the SSRT Mark3 received one or more words containing one or more of the following
error types: sync field error, Manchester encoding error, parity error, and/or bit count error.
This bit is set if the SSRT Mark3 is the receiving RT for an RT-to-RT transfer and one or more of the
following errors occurs: (1) If the transmitting RT responds with a response time of less than 4 s, per
MIL-STD-1553B (mid-parity bit to mid-sync); i.e., less than 2 s dead time; and/or (2) There is an
incorrect sync type or format error (encoding, bit count, and/or parity error) in the transmitting RT
Status Word; and/or (3) The RT address field of the transmitting RT Status Word does not match the
RT address in the transmit Command Word.
If the SSRT Mark3 is the receiving RT for an RT-to-RT transfer, if this bit is set, it indicates one or
more of the following error conditions in the transmit Command Word: (1) T/R bit = logic "0"; (2) sub-
address = 00000 or 11111; (3) same RT Address field as the receive Command Word.
If set, indicates that the SSRT Mark3 detected a Command sync in a received Data Word.
Set to logic "1" if the previous message had a low word count error.
RT-RT TRANSFER
NO RESPONSE
TIMEOUT
COMMAND WORD
CONTENTS ERROR
INVALID WORD
MANCHESTER/PARITY
ERROR RECEIVED
RT-RT TRANSFER RESPONSE
ERROR (no gap, data, sync,
address mismatch)
RT-RT TRANSFER -
T/R ERROR ON
SECOND COMMAND
OR
INVALID ADDRESS
INCORRECT SYNC TYPE
RECEIVED
LOW WORD COUNT
2
0 (LSB)
4
3
1
5
6
Set to logic "1" if the previous message had a high word count error.
HIGH WORD COUNT
7
Set to logic "1" to denote that the SSRT Mark3 has failed its off-line protocol self-test. This bit will be
logic "0" if the self-test passed or had not been performed.
BIT TEST FAIL
8
Set to logic "1" if the SSRT Mark3's Terminal flag RT status bit has been disabled by an Inhibit termi-
nal flag mode code command. Will revert to logic "0" if an Override inhibit terminal flag mode code
command is received.
TERMINAL FLAG INHIBITED
9
If this bit is set, it indicates that the subsystem had failed to respond with the DMA handshake input
DTGRT asserted within 10 s after the SSRT Mark3 has asserted DTREQ.
HANDSHAKE FAILURE
12
A loopback test is performed on the transmitted portion of every non-broadcast message. A validity
check is performed on the received version of every word transmitted by the SSRT Mark3. In addition,
a bit-by-bit comparison is performed on the last word transmitted by the RT for each message. If
either the received version of the last word does not match the transmitted version and/or the
received version of any transmitted word is determined to be invalid (sync, encoding, bit count, parity),
or a failsafe timeout occurs on the respective channel, the LOOP TEST FAILURE bit for the respec-
tive bus channel will be set.
CH. B LOOP TEST FAILURE
CH. A LOOP TEST FAILURE
14
13
Set if the SSRT Mark3's failsafe timer detected a fault condition. The transmitter timeout circuit will
automatically shut down the CH. A or CH. B transmitter if it transmits for longer than 660.5 s.
TRANSMITTER TIMEOUT
15
(MSB)
TABLE 5. INTERNAL BUILT-IN-TEST (BIT) WORD DEFINITION
DESCRIPTION
FUNCTION
BIT
If either of these bits are logic "1", this indicates that the respective 1553 transmitter has been shut
down by means of a Transmitter shutdown mode command.
TRANSMITTER SHUTDOWN B
TRANSMITTER SHUTDOWN A
11
10
Note:
Bits 15 through 9 are cleared only following a RESET input or receipt of a Reset Remote Terminal mode command. Bits 8 through 0 are updated
as a result of every message processed.
to a Transmit BIT Word Mode Code Command. The BIT word bit
functions and descriptions are provided in TABLE 5.
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