參數(shù)資料
型號： A60Q30-2
廠商： Electronic Theatre Controls, Inc.
元件分類： 保險(xiǎn)絲
英文描述： SEMICONDUCTOR PROTECTION FUSES
中文描述： 半導(dǎo)體保護(hù)保險(xiǎn)絲
文件頁數(shù)： 31/61頁
文件大?。?/td> 2024K
代理商： A60Q30-2
BCRTM-31
BIT 8
Monitor RT-RT Transfer. Set by the CPU, this function indicates that the BCRTM should receive and store
the message beginning at the location indicated by the data pointer.
Time Delay. The CPU sets this field, which causes the BCRTM to delay the specified time between sequential
message starts (see figures 13 and 14). Regardless of the value in the Time Delay field (including zero), the
BCRTM will at least meet the minimum 4
μ
s intermessage gap time as specified in MIL-STD-1553B. The
timer is enabled by having a non-zero value in this bit field. When using this function, please note:
BITs 7-0
Timer resolution is 16
μ
s. As an example, if a given message requires 116
μ
s to complete (including the minimum
4ms intermessage gap time) the value in the Time Delay field must be at least 00001000
(8 x 16
μ
s = 128
μ
s) to provide an intermessage gap greater than the 4ms minimum requirement.
If the timer is enabled and the Skip bit is set, the timer provides the programmed delay before proceeding.
If the message duration exceeds the timer delay, the message is completed just as if the time were
not enabled.
If SKIP = 1 and EOL = 1 the
HPINT
is generated if enabled
If SKIP = 1 and Interrupt and Continue = 1, the
STDINT
is generated
C.
Command Word One
. Initialized by the CPU, this location contains the first command word corresponding to the
Command Block’s message transfer.
D.
Command Word Two
. Initialized by the CPU, this location is for the second (transmit) command word in RT-RT
transfers. In messages involving only one RT, the location is unused.
E.
Data Pointer.
Initialized by the CPU, this location contains the starting location in RAM for the command block’s
message (see figure 15).
F.
Status Word One
. Stored by the BCRTM, this location contains the entire Remote Terminal status response.
G.
Status Word Two.
Stored by the BCRTM, this location contains the receiving Remote Terminal status word. For
transfers involving one Remote Terminal, the location is unused.
H.
Tail Pointer.
Initialized by the host CPU, the Tail Pointer contains the next Command Block’s starting address.
7.2 Polling
During a typical polling scenario (see figure 16) the Bus
Controller interrogates remote terminals by requesting them
to transmit their status words. This feature can also alert the
host if a bit is set in any RT status word response during
normal message transactions. The BCRTM enables the host
to initialize a chain of Command Blocks with the command
word’s Polling Enable bit. A programmable Polling
Compare Register (PCR) is provided. In the polling mode,
the Remote Terminal response is compared to the Polling
Compare Register contents. Program the PCR by setting the
PCR bits corresponding to the RT’s 1553 status word bits
to be compared. If they match (i.e., two 1’s in the same bit
position) then, if enabled in both the BC Command Block
Control Word and in the Standard Interrupt Enable Register
(Register 9), a polling comparison interrupt is generated.
Example 1. No bit match is present
PCR
RT’s 1553 Status Word response
Result No Polling Comparison Interrupt
00000000001
00000100010
Example 2. Bit match is present
PCR
RT’s 1553 Status Word response
Result Polling Comparison Interrupt
00100100000
00000100000
7.3 BC Error Detection
The Bus Controller checks for errors (see the Exception
Handling and Interrupt Logging and the RT Error Detection
sectons, pages 37 and 28) on each message transaction. In
addition, the BC compares the RT command word addresses
to the incoming status word addresses. The BC monitors for
response time-out and checks data and control words for
proper format according to MIL-STD-1553. Illogical
commands include incorrectly formatted RT-RT
Command Blocks.
Figure 15. Contiguous Data Storage
COMMAND BLOCK #1
DATA POINTER
COMMAND BLOCK #2
DATA POINTER
MESSAGE #1
MESSAGE #2
RAM
DATA WORD #1
DATA WORD #2
DATA WORD #3
DATA WORD #1
DATA WORD #2
DATA WORD #3
DATA WORD #4
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