PEB20256EV21GXP Infineon Technologies, PEB20256EV21GXP Datasheet - Page 57

• Manufacturer Part Number: PEB20256EV21GXP
• Manufacturer: Infineon Technologies

Specifications of PEB20256EV21GXP

• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

4.2
4.2.1
The time slot handler assigns any combination of time slots of ports configured in T1 or
E1, 4.096 MHz or 8.192 MHz mode to logical channels. The assigned time slots are
connected internally and the bit stream of one logical channel is mapped continuously
over the selected time slots. Since the receiver and the transmitter operate
independently of each other, the assignment of time slots to logical channels can be
done separately in receive and transmit direction. Any time slot can be assigned to any
channel and any sequence of time slots can be assigned to one channel.
In normal operation each time slot consists of eight bits and all bits are used for data
transmission. An available mask function provides the capability to mask selected bits,
which in turn are disabled for data transmission. This provides the possibility to operate
time slots with less than 64 kBit/s throughput. So, instead of mapping the bit stream of
one logical channel over all bits of the assigned time slots, the bit stream is mapped
continuously over all unmasked bits of the time slots belonging to that channel.
Masked bits are tri-stated in transmit direction. In receive direction masked data bits are
discarded.
Figure4-6
mode and time slots two and three are assigned to logical channel 5. The bit mask of
time slot two is set to FE
the third time slot is set to FD
Data Sheet
shows a simple assignment process. In this case one port is configured in E1
Time slot Handler
Channelized Modes
H
, which disables bit zero of that time slot, and the bit mask of
H
, which disables bit one.
57
Functional Description
PEB 20256 E
PEF 20256 E
04.2001