MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 58

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

MT90812
22.2
The Control register (CTL) selects Data/Connection Memory and defines Expansion bus position.
54
Read/Write Address is: 001
Reset Value is: 00
1 - 0
Bit
7
6
5
4
3
2
Control Register (CTL)
EBUS Data
Alaw/ law
Message
Position /
Stream
Enable
Output
Name
EBUS
Serial
FMAT
Mode
EBM
Rate
-
H
Unused.
Output enable for the serial outputs. If this input is low, STo0, STo1, EST0, EST1 are
high impedance. If this input is high, each channel may still be put into high impedance
state by using per channel control bit in the Connection Memory.
When 1, the contents of the Connection Memory Low are output on the Serial Output
stream except when the OE bit in CMH for the corresponding channels is low or the
ODE pin is low. When 0, the Connection Memory bits for each channel determine what
is output.
EBUS Mode select. Selects IDX Link Mode if low or TDM Link mode if high.
PCM format select. Selects CCITT PCM coding if high, or SIGN MAGNITUDE PCM if
low.
Companding Law selection. A-Law is selected when high. -Law is selected when
low.
When EBUS is in IDX Link Mode, EP0 and EP1 define the sequence of channels on the
expansion bus with respect to the frame pulse. (The four positions are shown as A to D
in Figure 7 on page 9)
00 selects the output to be the first of every four channels.
01 selects the output to be the second of every four channels.
10 selects the output to be the third of every four channels.
11 selects the output to be the fourth of every four channels.
When EBUS is in TDM Link mode, EP0 and EP1 define the data rate of the expansion
bus.
00 = 2.048 Mb/s.
01 = 4.096 Mb/s.
10 = 8.192 Mb/s.
The clock rate is determined by the Clock mode selected by bits CR1-0 in the Timing
Control Register (TC). Refer to description in “Timing and Clock Control” starting on
page 24.
H
-
7
STOE
6
MSG
5
EBM
4
FMAT
3
Description
A/U
2
EP1
1
EP0
0
Advance Information