MT90840AP Zarlink, MT90840AP Datasheet - Page 35

• Manufacturer Part Number: MT90840AP
• Description: Switch Fabric 512 x 2430/512 x 512/2.373K x 2.373K 5V 84-Pin PLCC Tube
• Manufacturer: Zarlink

Specifications of MT90840AP

• Package: 84PLCC
• Number Of Ports: 16
• Fabric Size: 512 x 2430|512 x 512|2.373K x 2.373K
• Switch Core: Non-Blocking
• Port Speed: 8.192|4.096|2.048 Mbps
• Operating Supply Voltage: 5 V

Register Description
Interface Mode Selection Register (IMS) - READ/WRITE
Note: Bits 1 & 2 must be set to 0 by the CPU.
DR1-0
PPS1-0
ODE
FDC
DR1 DR0
Serial Port Data Rate Selection. Select one of three different data rates at the serial inputs and outputs of the MT90840.
0
0
1
1
Parallel Port Data Rate Selection. Select one of three different data rates for the parallel port of the MT90840.
PPS1 PPS0
Output Drive Enable. When LOW, forces the MT90840 output-buffers on the serial and parallel data ports into the high
impedance state (STo0-STo7, STi0-STi7, and PDo0-7). If this output is HIGH, all channels have their output drive enable
controlled by the per-channel OE bits of Transmit Connection Memory High, or Receive Connection Memory High.
Full Direction Control. This bit should only be set HIGH at the 2.048 Mbps serial rate. When FDC is set HIGH, each time slot
on each of the 16 ST-BUS pins can be individually configured as input or output. Up to 512 serial channels can be “inserted”
onto the Transmit parallel port, or up to 512 parallel channels can be “dropped” to the serial port. Individual channel direction
is controlled by the DC bits in the RPCM High. When FDC is LOW, the number of input and output time slots are “balanced”,
and setting a nominal input to be an output causes the same-number output time slot on the same-number STo pin to become an
input. For applications at 4.096 and 8.192 Mbps, this bit should be LOW.
0
0
1
1
DR1
0
1
7
0
1
0
1
0
1
Data Rate
2.048 Mbps
4.096 Mbps
8.192 Mbps
reserved
DR0
Data Rate
reserved. Do not use.
6.480 Mbyte/s.
19.44 Mbyte/s.
16.384 Mbyte/s.
6
PPS1
5
PPS0
4
Zarlink Semiconductor Inc.
ODE
3
MT90840
35
0
2
0
1
FDC
0
Data Sheet