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MK50H28 Datasheet(PDF) 2 Page - STMicroelectronics

Part # MK50H28
Description  MULTI LOGICAL LINK FRAME RELAY CONTROLLER
PDF  64 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

MK50H28 Datasheet(HTML) 2 Page - STMicroelectronics

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MK50H28 will move multiple blocks of receive
and transmit data directly into and out of memory
through the Host’s bus. Moreover, the memory
management capability includes the chaining of
long frames. A possible system configuration for
the MK50H28 is shown in Figure 1.
The MK50H28 may be used with any of several
popular 16 and 8 bit microprocessors, such as
68000, 6800, Z8000, Z80, LSI- 11, 8086, 8088,
8080, etc.
The MK50H28 may be operated in either full or
half duplex mode. In half duplex mode, the RTS
and CTS modem control pins are provided. In full
duplex mode, these pins become user program-
mable I/O pins. All signal pins on the MK50H28
are TTL compatible. This has the advantage of
making the MK50H28 independent of the physical
interface. As shown in Figure 1, line drivers and
receivers are used for electrical connection to the
physical layer.
DESCRIPTION (Continued)
VSS-GND
DAL07
DAL06
DAL05
DAL04
DAL03
DAL02
DAL01
DAL00
READ
INTR
DALI
DALO
DAS
BMO, BYTE, BUSREL
BMI, BUSAKO
HOLD, BUSRQ
ALE, AS
CS
ADR
READY
RESET
VSS-GND
24
HLDA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
48
47
46
45
44
43
42
41
40
39
38
37
36
23
22
21
20
19
18
17
16
15
35
34
33
32
31
30
29
28
27
26
25
TCLK
A18
A19
A20
A21
A22
A23
RD
DSR, CTS
TD
SYSCLK
RCLK
DTR, RTS
VCC (+5V)
DAL08
DAL09
DAL10
DAL11
DAL12
DAL13
DAL14
DAL15
A16
A17
M
K
5
0
H
2
8
DIP48 PIN CONNECTION (Top view)
MK50H28
2/64



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