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PDF MA28155 Data sheet ( Hoja de datos )
| Número de pieza | MA28155 | |
| Descripción | Radiation Hard Programmable Peripheral Interface | |
| Fabricantes | Dynex | |
| Logotipo |  |
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Replaces June 1999 version, DS3575-4.0
MAM2A821815555
Radiation Hard Programmable
Peripheral Interface
DS3575-5.0 January 2000
The MA28155 is a general purpose programmable Input/
Output device designed for use with the MAS281
microprocessor. It has 24 I/O pins which may be individually
programmed in 2 groups of 12 and used in 3 major modes of
operation.
In the first mode (MODE 0), each group of 12 I/O pins may
be programmed in sets of 4 to be inputs or outputs. In the
second mode (MODE 1), each group may be programmed to
have 8 lines of input or output. Of the remaining 4 pins, 3 are
used for hand-shaking and interrupt control signals. The third
mode of operation (MODE 2) is the bidirectional bus mode,
which uses 8 lines for a bidirectional bus and 5 lines, borrowing
one from the other group, for hand-shaking.
FEATURES
s Radiation Hard to 1MRad (Si)
s High SEU Immunity, Latch Up Free
s Silicon-on-Sapphire Technology
s 24 Programmable l/O Pins
s All Inputs and Outputs are TTL Compatible
s Direct Bit Set/Reset Capability Easing Control Application
Interface
s Replaces Several MSI Packages
s Compatible with MAS281 (Mil-Std-1750A) Microprocessor
RD/WN
DSN
CSN
Figure 1: Block Diagram
1/20
1 page  
DSN
RD/WN
CSN, A1, A0
MA28155
RD/WN set-up and hold time
Figure 6: Basic Input (Write) Timing Diagram
Port Definition Mode 0
D4 D3 D1 D0
0 000
0 001
0 010
0 011
0 100
0 101
0 110
0 111
1 000
1 001
1 010
1 011
1 100
1 101
1 110
1 111
PORT A
(UPPER)
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
PORT C
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
PORT B
OUTPUT
OUTPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
PORT C
(LOWER)
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
Table 2: Port Definition Mode 0 (See Also Figure 3)
5/20
5 Page 
MA28155
BIDIRECTIONAL BUS L/O CONTROL
Signal Definition (Mode 2)
INTR (Interrupt Request):
A high on this output can be used to interrupt the CPU for
both input or output operations.
Output Operations
OBFN (Output Buffer Full):
The OBF output will go low to indicate that the CPU has
written data out to port A.
Input Operations
STBN (Strobe input):
A low on this input loads data in to the input latch,
IBF (Input Buffer Full Register Bit):
A high on this output indicates data has been loaded in to
the input latch,
INTE 2 (The INTE register bit associated with IBF).
Controlled by Bit Set/Reset of PC4.
ACKN (Acknowledge):
A low on this input enables the tri-state output buffer of port
A to send out the data. Otherwise, the output buffer will be in
the high impedance state,
INTE 1 (INTE register bit associated with OBFN):
Controlled by Bit Set/Reset of PC6.
DSN
RD/WN
Figure 16: Mode 2 Bidirectional
OBFAN
ACKAN
STBAN
11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MA28155.PDF ] | |
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