
MT9071
Preliminary Information
15
M1
29
OSCi
Oscillator Master Clock (CMOS compatible input).
For crystal operation, a
20MHz crystal is connected from this pin to OSCo. For clock oscillator operation,
this pin is connected to a clock source. See Figure 22 - Crystal Oscillator Circuit
and Figure 21 - Clock Oscillator Circuit.
Oscillator Master Clock (CMOS compatible output).
For crystal operation, a
20MHz crystal is connected from this pin to OSCi. For clock oscillator operation,
this pin is left unconnected. See the OSCi pin description.
External Sync Clock (CMOS compatible input/output).
In T1 and J1 modes,
the clock rate is 1.544MHz. In E1 mode, the clock rate is 2.048MHz. In Line Sync
Mode this is an input which may be used as the synchronization source for the
device. In Backplane Sync Mode this is an output which is synchronized to one of
the four incoming links.
Auxiliary Signals 0-3 (CMOS compatible output).
A programmable output
signal. See Section 3.6 Auxiliary Output Signals.
M2
30
OSCo
P2
35
ESYN
N1
N2
N3
P1
31
32
33
34
AUX0
AUX1
AUX2
AUX3
Micro Port Interface
K15
79
CS
Chip Select (CMOS compatible input).
A zero enables the read and write
functions of the MT9071 parallel processor interface; all bidirectional data bus
lines (D0-D15) will operate normally. A one disables the read and write
functions of the parallel processor interface; all bidirectional data bus lines (D0-
D15) will be in a high impedance state.
Data Strobe (CMOS compatible input).
Data Strobe for Motorola mode (IM=0).
The MT9071 reads data from the address bus (A0-A11) on the falling edge of DS;
writes data to the bidirectional data bus (D0-D15) on the falling edge of DS
(processor read); reads data from the bidirectional data bus (D0-D15) on the
falling edge of DS (processor write). DS may be connected to CS.
Read:
Read for Intel type mode (IM=1). The MT9071 reads data from the
address bus (A0-A11) on the falling edge of RD; writes data to the bidirectional
data bus (D0-D15) on the falling edge of RD (processor read).
Read/Write (CMOS compatible input).
Read and Write for Motorola mode
(IM=0). A zero sets the MT9071 bidirectional data bus lines (D0-D15) as inputs
for a processor write. A one sets the MT9071 bidirectional data bus lines as
outputs for a processor read.
Write:
Write for Intel type mode (IM=1). The MT9071 reads data from the address
bus (A0-A11) on the falling edge of WR; reads data from the bidirectional data
bus (D0-D15) on the falling edge of WR (processor write).
Intel / Motorola (CMOS compatible input).
High configures the processor
interface for Intel type of parallel non-multiplexed processors where RD and WR
pins are used. Low configures the processor interface for Motorola type of parallel
non-multiplexed processors where R/W and DS pins are used.
Interrupt Request (open drain output).
When zero, one or more of the four
transceivers in the MT9071 has generated an interrupt request. When one, the
MT9071 has not generated an interrupt request. IRQ is an open drain output that
should be connected to V
DD
through a pull-up resistor. CS can be either high or
low for this output pin to function.
K16
80
DS
(RD)
J16
81
RW
(WR)
J15
82
IM
R2
38
IRQ
Pin Description (continued)
LBGA
Pin
LQFP
Pin
Name
Description (see notes 1, 2, 3 and 4)