MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 17

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

Advance Information
address bits A6-A0, give access to the Control Registers if A9,A8,A7=111, or depending on the high order bits
A9,A8,A7, to the High or Low sections of the Connection Memory, or to the Data Memory, as shown in Table 1.
5.2
The Data Memory and Connect Memory Map, as shown in Table 2, illustrates the direct relationship between
DM and CM for each of the channels. As described earlier in “Switching” on page 10, the data from the
incoming TDM streams are written to Data Memory and the data is switched to the outgoing streams as
programmed in CM.
In addition to holding the incoming data from the TDM streams, Data Memory holds the output of the other
MT90812 blocks. This is described below in the following section. Expansion Memory page is used to hold the
incoming data for the expansion bus TDM streams. Refer to “Use of Data Memory Reserved for Expansion Bus
Streams” on page 15 for further description.
Connection Memory is used to specify the source for the outgoing channels and to connect the Conference,
Energy Detect and DBRT blocks to incoming channels. In addition CM is used to specify the gain for the
outgoing streams and the gain for the tones.
5.2.1
Table 3 details the mapping for Local Data Memory. The first block of 32 locations in Data Memory is used to
store the 32 bytes of data from the STi0 stream. Locations 20-3F are used for the 32 bytes of data from the
STi1 stream. The third block of 32 locations in Data Memory is used for output of the tone generator block as
described in “Tone Generation” on page 42 The next 32-bytes consist of conference outputs(15), DCHout(1),
and some unused locations(14).
Expansion
Address
Memory
Memory
A6-A0
Local
00-1F
20-3F
Page
Page
Data Memory and Connect Memory
Local Data Memory
Address
Sti0 32 Channels
STi1 32 Channels
A6-A0
00-1F
20-3F
40-5F
60-7F
00-1F
20-3F
40-5F
60-7F
Local Data Memory
Sti0 32 Channels
Sti1 32 Channels
Tones(32), FSK
Confout(15),
unused(1)
DCHout(1)
unused(15)
Ei1 32 Channels
Ei2 32 Channels
Ei3 32 Channels
Ei4 32 Channels
Table 2 - Data Memory and Connect Memory Pages
Data Memory
Pages
Sti0 32 Channels
STi1 32 Channels
Sto0 Outgoing Gain
Sto1 Outgoing Gain
Tone Gain
Conf - Incoming Gain(15)
IT - Incoming Gain(1)
DCH - Incoming Gain(1)
EDA -Incoming Gain(1)
EDB -Incoming Gain(1)
unused(13)
Ei1 Outgoing Gain
Ei2 Outgoing Gain
Ei3 Outgoing Gain
Ei4 Outgoing Gain
Connect Memory High
Memory Pages
Pages
Description
Sto0 32 Channels
Sto1 32 Channels
(Not used)
Conf Incoming Channel(15)
Insertion Tone - Channel(1)
DCH Incoming Channel(1)
EDA -Incoming Channel(1)
EDB -Incoming Channel(1)
unused(13)
Ei1 32 Channels
Ei2 32 Channels
Ei3 32 Channels
Ei4 32 Channels
Connect Memory Low
Pages
MT90812
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