XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 326

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT84L38
OCTAL T1/E1/J1 FRAMER
The DS1 Receive Overhead Output Interface Block allows an external device to be the consumer of the
Facility Data Link (FDL) bits in ESF framing format mode, Signaling Framing (Fs) bits in the SLC96 and N
framing format mode and Remote Signaling (R) bit in T1DM framing format mode This interface provides
interface signals and required interface timing to shift out proper data link information at proper time.
The Receive Overhead Output Interface for a given Framer consists of two signals.
•
•
The Receive Overhead Output Interface Clock Output pin (RxOHCLK_n) generates a rising clock edge for
each data link bit position according to configuration of the framer. The data link bits extracted from the
incoming T1 frames are outputted from the Receive Overhead Output Interface Output pin (RxOH_n) at the
rising edge of RxOHClk_n. The Data Link equipment should sample and latch the data link bits at the falling
edge of RxOHClk_n.
The figure below shows block diagram of the Receive Overhead Output Interface of XRT84L38.
The FDL bits in ESF framing format mode can be extracted to:
•
•
•
The Receive Data Link Source Select bits of the Receive Data Link Select Register (RDLSR) controls the
extraction of FDL bits in ESF framing format mode. The table below shows configuration of the Receive Data
Link Source Select bits of the Receive Data Link Select Register (RDLSR).
F
7.2
7.2.1
7.2.2
IGURE
RxOHClk_n: The Receive Overhead Output Interface Clock Output signal
RxOH_n: The Receive Overhead Output Interface Output signal.
DS1 Receive Overhead Output Interface Block
DS1 Receive HDLC Controller
DS1 Receive Serial Output Interface.
103. B
DS1 Receive Overhead Output Interface Block
Description of the DS1 Receive Overhead Output Interface Block
Configure the DS1 Receive Overhead Output Interface module as destination of the Facility
Data Link (FDL) bits in ESF framing format mode
LOCK
RxOHClk_n
D
RxOH_n
IAGRAM OF THE
DS1 R
Overhead Output
ECEIVE
Interface
Receive
O
306
VERHEAD
O
UTPUT
I
NTERFACE OF
From Receive
Framer Block
XRT84L38
REV. 1.0.1