MT90869AG Zarlink, MT90869AG Datasheet - Page 47

• Manufacturer Part Number: MT90869AG
• Description: Switch Fabric 16K x 16K/8K x 8K 1.8V/3.3V 272-Pin BGA Tray
• Manufacturer: Zarlink

Specifications of MT90869AG

• Package: 272BGA
• Number Of Ports: 64
• Fabric Size: 16K x 16K|8K x 8K
• Switch Core: Non-Blocking|Blocking
• Port Speed: 8.192|4.096|2.048 Mbps
• Operating Supply Voltage: 1.8|3.3 V

12.1
The 8-bit Backplane Data Memory (BDM) has 8,192 positions. The locations are associated with the backplane
input streams and channels. The address bits (A13:0) of the microprocessor define the addresses of the streams
and the channels. The BDM is configured as follows:
12.2
The 8-bit Local Data Memory (LDM) has 8,192 positions. The locations are associated with the local input streams
and channels. The address bits of the microprocessor define the addresses of the streams and the channels. The
LDM is configured as follows:
12.3
The Local Connection Memory (LCM) has 8,192 addresses of 16-bit words. Each address, accessed through bits
A13-A0 of the microprocessor port, is allocated to an individual Local output stream and channel. The bit definition
for each 16-bit word is presented in Table 11 for Local-to-Local and Backplane (Non-32 Mb/s Mode)-to-Local
connections, and in Table 12, for Local-to-Local and Backplane(32 Mb/s Mode)-to-Local connections. Bit LSRC
selects the switch configuration for Backplane-to-Local or Local-to-Local. When the per-channel Message Mode is
selected (LMM = HIGH), the lower byte of the LCM word (LCAB7-0) will be transmitted as data on the output
stream (LSTo0-31) in place of data defined by the Source Control, Stream and Channel Address bits.
Bit
15
14
13
15-8
Bit
7-0
15-8
7-0
Bit
Local Data Memory Bit Definition
Local Connection Memory Bit Definition
Backplane Data Memory Bit Definition
Name
LSRC
LMM
LE
Reserved
Name
BDM
Reserved
Source Control Bit
When LOW, the source is from the Backplane input port (Backplane Data Memory).
When HIGH, the source is from the Local input port (Local Data Memory).
Ignored when LMM is set HIGH.
Local Message Mode Bit
When LOW, the channel is in Connection Mode.
When HIGH, the channel is in Message Mode.
Local Output Enable Bit
When LOW the channel may be high impedance, either at the device output, or set by an
external buffer dependent upon the LORS pin. When HIGH the channel is active.
Name
LDM
Set to a default value of 0
Backplane Data Memory
Backplane Input Channel Data
Table 9 - Backplane Data Memory (BDM) Bits
Table 10 - Local Data Memory (LDM) Bits
Set to a default value of 0
Local Data Memory
Local Input Channel Data
Zarlink Semiconductor Inc.
MT90869
47
Description
Description
Description
Data Sheet
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