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參數(shù)資料
| 型號： | BU-62864G3-142S |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72 |
| 封裝： | 1 INCH, CERAMIC, QFP-72 |
| 文件頁數(shù)： | 41/99頁 |
| 文件大?。?/td> | 578K |
| 代理商： | BU-62864G3-142S |
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Data Device Corporation
62743_pre7_noSA-DB.DOC
www.ddc-web.com
8-07-02
46
Table 53. Condition Codes
BIT
CODE
NAME
(Bit 4 = 0)
INVERSE
(Bit 4 = 1)
FUNCTIONAL DESCRIPTION
0
LT/GP0
GT/GP0*
Less Than Flag set or cleared after CFT or CMT operation. Also, General
Purpose Flag 0 may be set or cleared by a FLG operation.
1
EQ/GP1
NE/GP1*
Equal Flag set or cleared after CFT or CMT operation. Also, General
Purpose Flag 1 may be also be set or cleared by a FLG operation.
2
GP2
GP2*
General Purpose Flags set or cleared by FLG operation or by host
processor. The host processor can set, clear, or toggle these flags in the
same way as the FLG instruction by means of the BC GENERAL
PURPOSE FLAG REGISTER.
3
GP3
GP3*
4
GP4
GP4*
5
GP5
GP5*
6
GP6
GP6*
7
GP7
GP7*
8
NORESP
RESP*
NORESP indicates that an RT has either not responded or has responded
later than the BC No Response Timeout time. The PCI Enhanced Mini-
ACE's No Response Timeout Time is defined per MIL-STD-1553B as the
time from the mid-bit crossing of the parity bit to the mid-sync crossing of
the RT Status Word. The value of the No Response Timeout value is
programmable from among the nominal values 18.5, 22.5, 50.5, and 130
s (±1 s) by means of bits 10 and 9 of Configuration Register #5.
9
FMT ERR
FMT ERR*
FMT ERR indicates that the received portion of the most recent message
contained one or more violations of the 1553 message validation criteria
(sync, encoding, parity, bit count, word count, etc.), or the RT's status word
received from a responding RT contained an incorrect RT address field.
A
GD BLK
XFER
GD BLK
XFER*
For the most recent message, GD BLK XFER will be set to logic "1"
following completion of a valid (error-free) RT-to-BC transfer, RT-to-RT
transfer, or transmit mode code with data message. This bit is set to logic
"0" following an invalid message. GOOD DATA BLOCK TRANSFER is
always logic "0" following a BC-to-RT transfer, a mode code with data, or a
mode code without data. The Loop Test has no effect on GOOD DATA
BLOCK TRANSFER. GOOD DATA BLOCK TRANSFER may be used to
determine if the transmitting portion of an RT-to-RT transfer was error free.
B
MASKED
STATUS
SET
MASKED
STATUS
BIT*
Indicates that one or both of the following conditions have occurred for the
most recent message: (1) If one (or more) of the Status Mask bits (14
through 9) in the BC Control Word is logic "0" and the corresponding bit(s)
is (are) set (logic "1") in the received RT Status Word. In the case of the
RESERVED BITS MASK (bit 9) set to logic "0," any or all of the 3
Reserved Status bits being set will result in a MASKED STATUS SET
condition; and/or (2) If BROADCAST MASK ENABLED/XOR* (bit 11 of
Configuration Register #4) is logic "1" and the MASK BROADCAST bit of
the message's BC Control Word is logic "0" and the BROADCAST
COMMAND RECEIVED bit in the received RT Status Word is logic "1.".
C
BAD
MESSAGE
GOOD
MESSAGE
BAD MESSAGE indicates either a format error, loop test fail, or no
response error for the most recent message. Note that a “Status Set”
condition has no effect on the “BAD MESSAGE/GOOD MESSAGE”
condition code.
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