UT1553B/BCRTMP-WPA 查看數據表（PDF） - Aeroflex UTMC
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UT1553B/BCRTMP-WPA Datasheet PDF : 78 Pages
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CONTROL SIGNALS
NAME
RD
WR
CS
AEN
PIN NUMBER
F/P
PGA
62
J15
63
H14
61
K15
60
J13
TYPE ACTIVE
DESCRIPTION
TI
AL Read. The host uses this in conjunction with CS to read an
internal BCRT register.
TI
AL Write. The host uses this in conjunction with CS to write an
internal BCRTMP register.
TI
AL Chip Select. This selects the BCRTMP when accessing
the BCRTMP’s internal register.
TI
AH Address Enable. The host CPU uses AEN to indicate to the
BCRTMP that the BCRTMP’s address lines can be asserted;
this is a precautionary signal provided to avoid address bus
crash. If not used, it must be tied high.
BCRTSEL 87
LOCK
15
EXTOVR
88
MRST
7
MEMCSO
69
A13
TUI
M3
TUI
B11
TUI
K3
TI
G15
TO
--
BC/RT Select. This selects between either the Bus
Controller or Remote Terminal mode. The BC/RT Mode
Select bit in the Control Register overrides this input if
the LOCK pin is not high. This pin is internally
pulled high.
AH
Lock. When set, this pin prevents internal changes
to the RT address and BC/RT mode select functions as
well as the Operation Mode select (MD7-MD0) functions.
This pin is internally pulled high.
AL
External Override. Use this in multi-redundant
applications. Upon receipt, the BCRTMP aborts all
current activity. EXTOVR should be connected to
COMSTR output of the adjacent BCRTMP when used.
This pin is internally pulled high.
AL
Master Reset. This resets all internal state machines,
encoders, decoders, and registers. The minimum pulse
width for a successful Master Reset is 500ns.
Memory Chip Select Out. This is the regenerated
AL MEMCSI input for external RAM during the pseudo-
dual-port RAM mode. The BCRTMP also uses it to select
external memory during memory accesses.
MEMCSI
64
H15
TUI
AL Memory Chip Select In. Used in the pseudo-dual-port
RAM mode only, MEMCSI is received from the host and
is propagated through to the MEMCSO. This pin is
internally pulled high.
RRD
70
F15
TO
AL RAM Read. In the pseudo-dual-port RAM mode, the host
uses this signal in conjunction with MEMCSO to read
from external RAM through the BCRTMP. It is also the
signal the BCRTMP uses to read from memory. It is
asserted following receipt of DMAG. When the BCRTMP
performs multiple reads, this signal is pulsed.
RWR
71
G14
TO
AL RAM Write. In the pseudo-dual-port RAM mode, the
CPU and BCRTMP use this to write to external RAM.
This signal is asserted following receipt of DMAG. For
multiple writes, this signal is pulsed.
BCRTMP-8
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