pt7a6527 Pericom Technology Inc, pt7a6527 Datasheet - Page 6

• Manufacturer Part Number: pt7a6527
• Description: Hdlc Controller
• Manufacturer: Pericom Technology Inc

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Figure 3 PT7A6527 on a Line Card in a Mixed D-Channel Processing Architecture
Functional Description
General Functions
The PT7A6527 is an HDLC controller which handles four
HDLC communication channels, each channel fully
independent and programmable by its own register set. The
circuit performs the following functions:
-
PT0080(02/09)
Extraction (reception) and insertion (transmission) of the
HDLC data packets in a time division multiplex bit
stream.
Line
Transceivers
Line
Transceivers
* S Packets will be discarded by the receiver.
p = Time-Slot for p packets, s = Time-Slot for s packets
Coll s-p = Time-Slot containinginformation about a collisionbetween s packets and p packets
Note:
D
PT7A6527
D
IOM
s
IOM
®
®
D
D
s
s
p
Coll s-p
p
s
PT7A6527
PT7A6555
PT7A6555
µ P
µ P
6
-
-
-
-
-
Implementation of the basic HDLC functions of the layer-
2 protocol, including address recognition.
Interfacing of the data packets to the microprocessor bus.
For the temporary storage of data packets internal FIFOs
are used.
Switching of data between serial interfaces.
Implementation of different types of collision resolution.
Test functions.
B
B
p
p(s)*
B + p
B + p(s)* + Coll s-p
Coll s-p
System
Highways
HDLC controller
System
Highways
Data Sheet
PT7A6527
Ver:4