PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 274

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 72
Interrupt Driven Transmission Example
8.1.3.2 HDLC Data Reception
Also 2
interrupt indications concerned with the reception of data:
RPF (Receive Pool Full) interrupt, indicating that a 32-byte-block of data can be read
from RFIFO and the received message is not yet complete.
RME (Receive Message End) interrupt, indicating that the reception of one message is
completed.
The following figure 73 gives an example of a reception sequence, assuming that a
“long” frame (66 bytes) followed by two short frames (6 bytes each) are received.
Figure 73
Interrupt Driven Reception Sequence Example
8.1.4
The QuadFALC supports signaling and maintenance functions for T1 - Primary Rate
Interfaces using the Extended Super Frame format. The device supports the DL-channel
protocol for ESF format according to T1.403-1989 ANSI or to AT&T TR54016
specification. The HDLC- and Bit Oriented Message (BOM) -Receiver can be switched
ON/OFF independently. If the QuadFALC is used for HDLC formats only, the BOM
receiver has to be switched off. If HDLC- and BOM-receiver has been switched on
Semiconductor Group
FALC
System
Interface
CPU
Interface
R
Bit Oriented Message Mode
32 byte FIFO buffers are provided in receive direction. There are different
Receive Frame 1 (66 bytes)
32
RPF
RD RFIFO
32 bytes
32
RMC
RPF
2
RF2 RF3
6
RD RFIFO
32 bytes
6
RMC
274
RME
RMC
Operational Description T1 / J1
RME
RMC
RME
PEB 22554
ITD10972
RMC
09.98