MK50H28N ST Microelectronics, Inc., MK50H28N Datasheet - Page 2

• Manufacturer Part Number: MK50H28N
• Description: Multi Logical Link Frame Relay Controller
• Manufacturer: ST Microelectronics, Inc.

MK50H28
DESCRIPTION (Continued)
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,
DIP48 PIN CONNECTION (Top view)
2/64
BMO, BYTE, BUSREL
HOLD, BUSRQ
BMI, BUSAKO
VSS-GND
VSS-GND
ALE, AS
HLDA
READY
RESET
DAL07
DAL06
DAL05
DAL04
DAL03
DAL02
DAL01
DAL00
READ
INTR
DALI
DALO
DAS
CS
ADR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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.
M
K
5
0
H
2
8
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VCC (+5V)
DAL08
DAL09
DAL10
DAL11
DAL12
DAL13
DAL14
DAL15
A16
A17
A18
A19
A20
A21
A22
A23
RD
DSR, CTS
TD
SYSCLK
RCLK
DTR, RTS
TCLK