參數(shù)資料
型號(hào): BU-61865G3-202K
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
文件頁數(shù): 42/60頁
文件大小: 457K
代理商: BU-61865G3-202K
47
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
SELECT (I)
61
Generally connected to a CPU address decoder output to select the Enhanced Mini-
ACE/-ACE for a transfer to/from either RAM or register.
B12
STRBD (I)
62
Strobe Data. Used in conjunction with SELECT to initiate and control the data transfer
cycle between the host processor and the Enhanced Mini-ACE/-ACE. STRBD must
be asserted low through the full duration of the transfer cycle.
B14
RD / WR
63
Read/Write. For a host processor access, RD/WR selects between reading and writing.
In the 16-bit buffered mode, if POL_SEL is logic "0, then RD/WR should be low (logic
“0") for read accesses and high (logic "1") for write accesses. If POL_SEL is logic "1",
or the interface is configured for a mode other than 16-bit buffered mode, then RD/WR
is high (logic "1") for read accesses and low (logic "0") for write accesses.
A12
ADDR_LAT(I) /
MEMOE (O)
14
Memory Output Enable or Address Latch.
In buffered mode, the ADDR_LAT input is used to configure the buffers for A15-A0,
SELECT, MEM/REG, and MSB/LSB (for 8-bit mode only) in latched mode (when low)
or transparent mode (when high). That is, the Enhanced Mini-ACE/-ACE's internal
transparent latches will track the values on A15-A0, SELECT, MEM/REG, and
MSB/LSB when ADDR_LAT is high, and latch the values when ADDR_LAT goes low.
In general, for interfacing to processors with a non-multiplexed address/data bus,
ADDR_LAT should be hardwired to logic "1". For interfacing to processors with a multi-
plexed address/data bus, ADDR_LAT should be connected to a signal that indicates a
valid address when ADDR_LAT is logic "1".
In transparent mode, MEMOE output signal is used to enable data outputs for external
RAM read cycles (normally connected to the OE input signal on external RAM chips).
V8
ZEROWAIT (I) /
MEMWR (O)
23
Memory Write or Zero Wait. In buffered mode, input signal (ZEROWAIT) used to select
between the zero wait mode (ZEROWAIT = “0") and the non-zero wait mode
(ZEROWAIT = "1").
In transparent mode, active low output signal (MEMWR) asserted low during memory
write transfers to strobe data into external RAM (normally connected to the WR input
signal on external RAM chips).
U8
16 / 8 (I) /
DTREQ (O)
24
Data Transfer Request or Data Bus Select. In buffered mode, input signal 16/8 used to
select between the 16 bit data transfer mode (16/8= "1") and the 8-bit data transfer
mode (16/8 = "0").
In transparent mode (16-bit only), active low level output signal DTREQ used to
request access to the processor/RAM interface bus (address and data buses).
V7
MSB / LSB (I) /
DTGRT (I)
64
Data Transfer Grant or Most Significant Byte/Least Significant Byte.
In 8-bit buffered mode, input signal (MSB/LSB) used to indicate which byte is currently
being transferred (MSB or LSB). The logic sense of MSB/LSB is controlled by the
POL_SEL input. MSB/LSB is not used in the 16-bit buffered mode.
In transparent mode, active low input signal (DTGRT) asserted in response to the
DTREQ output to indicate that control of the external processor/RAM bus has been
transferred from the host processor to the Enhanced Mini-ACE/-ACE.
U6
TABLE 51. PROCESSOR INTERFACE CONTROL
SIGNAL NAME
DESCRIPTION
BU-6186XFX/GX
BU-6184XFX/GX
BU-6174XFX/GX
BALL
PIN
BU-61860BX
BU-61840BX
BU-61740BX
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