T7115AMCD LSI, T7115AMCD Datasheet - Page 26

• Manufacturer Part Number: T7115AMCD
• Manufacturer: LSI

Specifications of T7115AMCD

• Package Type: PLCC
• Lead Free Status / Rohs Status: Not Compliant

T7121 HDLC Interface for ISDN (HIFI-64)
Functional Description
In the local loopback mode:
26
CLKRI (R9—B0) must equal CLKXI (R9—B4). We recommend changing CLKRI to match CLKXI (other highway
parameters need not be altered).
CLKX clocks both the transmitter and the receiver.
The transmitter and receiver must both be enabled. The transmitter output is internally connected to the receiver
input.
The DXA and DXB outputs are active, depending on DXAC and DXBC.
The DRA or DRB input is ignored.
The communication between the transmit and receive FIFO buffers and the microprocessor continues normally.
DATA TO BE
TRANSMITTED
FIFO
FIFO
(continued)
Figure 10. Local Loopback Mode
TRANSMITTER
RECEIVER
HDLC
HDLC
CHI
CHI
DRA
DXB
(USER-SELECTED)
DRB
(IGNORED)
DXA
OR
Lucent Technologies Inc.
Data Sheet
April 1997
5-5036