PEF2054NV21XK Lantiq, PEF2054NV21XK Datasheet - Page 87

• Manufacturer Part Number: PEF2054NV21XK
• Manufacturer: Lantiq

Specifications of PEF2054NV21XK

• Lead Free Status / Rohs Status: Compliant

Two Groups
• Timing characteristics and
• Handling of special channels (C/I or signaling channel, monitor or feature control
The timing characteristics (data rate, clock rate, bit timing, etc. … ) are programmed in
the CFI registers (see chapter 5.2.2.2). The CFI data rate, for example, can be selected
between 128 kbit/s and 8.192 Mbit/s. This covers the standard IOM and SLD data rates
of 256, 512, 768 kbit/s and 2.048 Mbit/s.
The special channels are initialized on a per time slot basis in the control memory (CM).
This programming on a per time slot basis allows a dedicated usage of each CFI port
and time slot: an application that requires only two IOM-2 compatible layer-1
transceivers will also only occupy 8 CFI time slots (2 IOM channels) for that purpose.
The remaining 24 time slots can then be used for general switching applications or for
the connection of non IOM-2 compatible devices that require a special P handling.
The Special Channels can be Divided into Two Groups
• Monitor/Feature Control channels and
• Control/Signaling channels
The Monitor/Feature Control handler can be adjusted to operate according to the
– IOM-1 protocol (up to 1 byte, no handshake), the
– IOM-2 protocol (any number of bytes, handshake using the MR and MX bits) and to
– SLD protocol (up to 16 bytes in subsequent frames without handshake)
The Monitor/Feature Control handler is a dedicated unit that communicates only with
one IOM or SLD channel at a time. An address register selects one out of 64 possible
MF channels. A 16 byte bidirectional FIFO (MFFIFO) provides intermediate storage for
the data to be sent or received. The message transfer over the MF channel is always
half-duplex, i.e. data can either be sent at a time or received at a time.
The Characteristics of the Different IOM
Note: If the IOM-2 protocol is selected, the actual message length i.e. the number of
If non handshake protocols (IOM-1 and SLD) are used, the EPIC must always be the
master of the MF communication. Example: the EPIC programs and reads back the
coefficients of a SICOFI (PEB 2060) device.
If the handshake protocol is used (IOM-2), a balanced MF communication is also
possible: since the MF handler cannot be pointed to all IOM-2 channels at the same time,
the EPIC has implemented a search function that looks for active monitor transmit
handshake (MX) bits on all upstream IOM-2 channels. If an active channel is found, the
address is stored and an interrupt is generated. The MF handler can then be pointed to
Semiconductor Group
channel)
the
bytes to be sent or received is unlimited and is not restricted by the MFFIFO size!
87
®
and SLD Interfaces can be Divided into
Application Hints
PEB 2055
PEF 2055