PEF2054NV21XK Lantiq, PEF2054NV21XK Datasheet - Page 205

• Manufacturer Part Number: PEF2054NV21XK
• Manufacturer: Lantiq

Specifications of PEF2054NV21XK

• Lead Free Status / Rohs Status: Compliant

PEB 2055
PEF 2055
Application Hints
done (STAR = 17
), the P issues again (with an empty MFFIFO) the transmit + receive
H
command (CMDR = 08
) and the EPIC is again ready to receive and acknowledge
H
further monitor bytes.
– IOM-1, handshake facility disabled
The contents of the MFFIFO are sent to the subscriber circuit at a speed of 1 byte per
frame. When the last byte has been transmitted, the EPIC stores the received monitor
bytes of the next subsequent frames into the MFFIFO. The receive transfer is completed
and an ISTA:MFFI interrupt is generated after either 1, 2, 8, or 16 frames. The actual
number of stored bytes can be selected with MFSAR:MFTC1,MFTC0.
Transmit + Receive Same Line Command
This command is similar to the Transmit + Receive same time slot command i.e. it can
be used to send a message to a subscriber circuit which will respond with an answer. Its
use is, however, intended for SLD applications: CFI mode 3, 8 time slots/frame,
handshake facility disabled.
The transmit operation is performed in the downstream time slot specified in MFSAR
while the receive operation is performed on the same SIP line, but four time slots later
in the upstream time slot.
Transmit Broadcast Command
The Transmit Broadcast Command can be used for sending a monitor/feature control
message to all subscriber circuits simultaneously. It is applicable for both handshake
and non handshake protocols. The procedure is similar to the normal transmit command
with the exception that the contents of the MFFIFO is transmitted on all downstream MF
time slots (defined by the CM code field). If the handshake protocols is active (IOM-2)
the data bytes are transmitted at a speed of one byte per three frames and the arriving
acknowledgments are ignored.
Test Operation Command
When executing the Test Operation Command, a message written to the MFFIFO will
not be transmitted to the subscriber circuit but may instantaneously be read back. All
interrupts (ISTA) and status (STAR) bits will be generated in the same manner as for a
normal transmit + receive transfers. It is applicable for both handshake and
non-handshake protocols.
Semiconductor Group
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