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MT9079AC Datasheet(PDF) 39 Page - Mitel Networks Corporation

Part # MT9079AC
Description  CMOS ST-BUS??FAMILY Advanced Controller for E1
PDF  54 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MT9079AC Datasheet(HTML) 39 Page - Mitel Networks Corporation

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MT9079
4-275
The data link transmit and receive signals are
connected directly to port one. The DCLK signal is
connected to INT1 so the 80C52 will be interrupted
when new data link data needs to be transported.
Figure 9 illustrates a circuit that will interface the
MT9079 to the MC68302 microprocessor operating
at 20 MHz. CS0 was chosen so that no external
address decoding would be required. The MT9079
does not have a DTACK output therefore, the
MC68302 DTACK should be tied high. The data link
interface
is
handled
by
Non-multiplexed
Serial
Interface port Two (NMSI2).
Figure 10 shows how to connect a 16 MHz 80C188
microprocessor to the MT9079. The 80C188 WR and
RD signals are re-timed using the CLKOUT signal to
generate a DS signal for the MT9079. The inverted
form of DT/R is used to make a R/W signal, and the
ALE is used to latch the lower order address lines for
the duration of the access cycle.
MT9079 TAIS and Reset Circuit
Figure 11 illustrates a reset and transmit AIS circuit
that
can
be
implemented
with
the
MC68302
microprocessor. This circuit has three purposes: 1)
to provide a power-on reset for the all the MT9079
devices; 2) to have all the MT9079 devices transmit
AIS during system initialization; and 3) to have all the
MT9079 devices transmit AIS when the MC68302
watch-dog time expires.
Figure 9 - MT9079 to MC68302 (20 MHz) Microprocessor Interface Circuit
Figure 10 - MT9079 to 80C188 (16 MHz) Microprocessor Interface Circuit
CS0
IRQ7
A0-A4
D0-D7
BCLR
DTACK
RxD2
5
8
700k
Ω
CS
IRQ
AC0-AC4
D0-D7
RxDL
TxDL
DLCLK
S/P
MT9079
MC68302
EXTAL
XTAL
LDS
R/W
10k
Ω
10k
Ω
10k
Ω
DS
R/W
+5V
BERR
BGACK
AVEC
BR
FRZ
DISCPU
BUSW
+5V
10k
Ω
+5V
10k
Ω
+5V
+5V
4.7k
Ω
+5V
10k
Ω
TxD2
RCLK2
TCLK2
74HCT04
25pF
25pF
RD
AD0-AD7
CLKOUT
DT/R
LCS, MCS,
CS
D0-D7
IRQ
MT9079
80C188
WR
R/W
+5V
10k
Ω
NMI
74F04
UCS, or PCS
74F04
74F04
D
CLR
Q
Q
DS
74F86
74F04
74F74
S/P
OE
CP
Qn
ALE
Dn
5
5
AC0-AC4
74F374
8
8



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