XRT86VL32IB datasheet(31/154 Pages) EXAR

Part #	XRT86VL32IB

Description	T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

PDF	154 Pages

Scroll/Zoom	100%

Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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XRT86VL3X

REV. 1.2.3

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

3.4

Receive HDLC Event Timing

The following figure shows the event timing of RxEOT and RxIDLE when receiving HDLC message.

3.5

SS7 (Signaling System Number 7) for ESF in DS1 Only

To support SS7 specifications while receiving LAPD messages, EXAR’s Framer will generate an interrupt (if

SS7 is enabled) once the HDLC controllers have received more than 276 bytes within two flag sequences

(0x7E) of a LAPD message. Each HDLC controller supports SS7. For example: To enable SS7 for all HDLC

controllers, registers 0xnB11 (LAPD1), 0xnB19 (LAPD2), 0xnB29 (LAPD3) must be set to 0x01.

FIGURE 32. RECEIVE HDLC EVENT TIMING

96-Bytes

4-Bytes

LAPD

RxEOT

RxIDLE

96-Bytes

LAPD

RxEOT

RxIDLE

75-Bytes

LAPD

RxEOT

RxIDLE

Figure a. Receiving a 100-Byte Message

Figure c. Receiving a 75-Byte Message

Figure b. Receiving a 96-Byte Message

XRT86VL32IB Datasheet(PDF) 31 Page - Exar Corporation