參數(shù)資料
型號(hào)： BU-61845G3-492K
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： 25.40 X 25.40 MM, 2.54 MM HEIGHT, CERAMIC, QFP-72
文件頁(yè)數(shù)： 43/60頁(yè)
文件大?。?/td> 457K
代理商： BU-61845G3-492K
48
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
POL_SEL (I) /
DTACK (O)
29
Data Transfer Acknowledge or Polarity Select. In 16-bit buffered mode, if POL_SEL is
connected to logic "1", RD/WR should be asserted high (logic "1") for a read operation
and low (logic "0") for a write operation. In 16-bit buffered mode, if POL_SEL is con-
nected to logic "0", RD/WR should be asserted low (logic "0") for a read operation and
high (logic "1") for a write operation.
In 8-bit buffered mode (TRANSPARENT/ BUFFERED = "0" and 16/8 = "0"), POL_SEL
input signal used to control the logic sense of the MSB/LSB signal. If POL_SEL is con-
nected to logic "0", MSB/LSB should be asserted low (logic "0") to indicate the transfer
of the least significant byte and high (logic "1") to indicate the transfer of the most sig-
nificant byte. If POL_SEL is connected to logic "1", MSB/LSB should be asserted high
(logic "1") to indicate the transfer of the least significant byte and low (logic "0") to indi-
cate the transfer of the most significant byte.
In transparent mode, active low output signal (DTACK) used to indicate acceptance of
the processor/RAM interface bus in response to a data transfer grant (DTGRT). The
Enhanced Mini-ACE/-ACE's RAM transfers over A15-A0 and D15-D0 will be framed
by the time that DTACK is asserted low.
U7
TRIG_SEL (I) /
MEMENA_IN (I)
28
Memory Enable or Trigger Select input. In 8-bit buffered mode, input signal (TRIG-SEL)
used to select the order in which byte pairs are transferred to or from the Enhanced
Mini-ACE/-ACE by the host processor. In the 8-bit buffered mode, TRIG_SEL should
be asserted high (logic 1) if the byte order for both read operations and write opera-
tions is MSB followed by LSB. TRIG_SEL should be asserted low (logic 0) if the byte
order for both read operations and write operations is LSB followed by MSB.
This signal has no operation in the 16-bit buffered mode (it does not need to be con-
nected).
In transparent mode, active low input MEMENA_IN, used as a Chip Select (CS) input to the
Enhanced Mini-ACE/-ACE's internal shared RAM. If only internal RAM is used, should be
connected directly to the output of a gate that is OR'ing the DTACK and IOEN output signals.
V6
MEM / REG(I)
1
Memory/Register. Generally connected to either a CPU address line or address
decoder output. Selects between memory access (MEM/REG = "1") or register access
(MEM/REG = "0").
B13
SSFLAG (I) /
EXT_TRIG(I)
32
Subsystem Flag (RT) or External Trigger (BC/Word Monitor) input. In RT mode, if this
input is asserted low, the Subsystem Flag bit will be set in the Enhanced Mini-ACE/-
ACE's RT Status Word. If the SSFLAG input is logic "0" while bit 8 of Configuration
Register #1 has been programmed to logic "1" (cleared), the Subsystem Flag RT
Status Word bit will become logic "1", but bit 8 of Configuration Register #1, SUBSYS-
TEM FLAG, will return logic "1" when read. That is, the sense on the SSFLAG input
has no effect on the SUBSYSTEM FLAG register bit.
In the non-enhanced BC mode, this signal operates as an External Trigger input. In BC
mode, if the external BC Start option is enabled (bit 7 of Configuration Register #1), a
low to high transition on this input will issue a BC Start command, starting execution of
the current BC frame.
In the enhanced BC mode, during the execution of a Wait for External Trigger (WTG)
instruction, the Enhanced Mini-ACE/-ACE BC will wait for a low-to-high transition on
EXT_TRIG before proceeding to the next instruction.
In the Word Monitor mode, if the external trigger is enabled (bit 7 of Configuration
Register #1), a low to high transition on this input will initiate a monitor start.
This input has no effect in Message Monitor mode.
T2
TABLE 51. PROCESSOR INTERFACE CONTROL (CONT.)
SIGNAL NAME
DESCRIPTION
BU-6186XFX/GX
BU-6184XFX/GX
BU-6174XFX/GX
BALL
PIN
BU-61860BX
BU-61840BX
BU-61740BX
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