CDB61318 Cirrus Logic, Inc., CDB61318 Datasheet - Page 5

• Manufacturer Part Number: CDB61318
• Description: T1/e1 Line Interface Units
• Manufacturer: Cirrus Logic, Inc.

8. PROTOTYPING AREA
An ample prototyping area with power supply and
ground connections is provided on the evaluation
board. This area can be used to develop and test a
variety of additional circuits such as framer devic-
es, system synchronizer PLLs, or specialized inter-
face logic.
9. EVALUATION HINTS
1) The orientation of pin 1 for the CS61318 is
2) Component locations R1-R2, R3-R4, Y1, T1
DS441DB1
E1 (120 )/LH
E1 (75 )/SH
HDR4
HDR5
HDR6
HDR7
HDR8
HDR9
HDR10
HDR11
HDR12
Jumper
marked by a small circle on the top-left side of
the socket U1.
and T2 must have the correct values installed
according to the application. All the necessary
components are included with the evaluation
board.
NLOOP_LED Hardware Mode operation, connects NLOOP pin to the LED
XTAL-GND
Mode
Position
XTAL-HI
MCLK
GND
OUT
INT
IN
IN
IN
IN
X
X
Grounds TRING on the line side of the transmit transformer
Grounds the line side of RRING through C2
Host Mode operation, connects INT pin to the serial interface
Grounds the MCLK pin
Connects the MCLK pin to the BNC
Pulls the TNEG pin high, for selecting the coder mode (TCLK has to be present for
selecting the coder mode)
Pulls the pin XTALIN high
Pulls the pin XTALIN to ground
Don’t care (shorted)
Allows S2 to pull RLOOP and LLOOP high for RESET in hardware mode
Allows S2 to pull RLOOP, LLOOP, and TAOS high for enabling NLOOP in hardware mode
Provides access to the serial port signals
Table 2. Transformer and Resistor Options
TX Transformer
SH=Short Haul; LH = Long Haul;
* Default setting from the factory
1:1.58
1:2
Table 3. Jumper Selections
RX Transformer
3) Closing a DIP switch on SW1 away from the
4) When performing a manual loopback of the re-
5) Jumpers can be placed on header HDR4 to pro-
Properly terminate TTIP/TRING when evaluating
the transmit output pulse shape. For more informa-
tion concerning pulse shape evaluation, refer to the
Crystal application note entitled "Measurement and
Evaluation of Pulse Shapes in T1/E1 Transmission
Systems."
Junction Selected
label sets the CS61318 control pin of the same
name to logic 1.
covered signal to the transmit signal at the BNC
connectors, the recovered data must be valid on
the falling edge of RCLK to properly latch the
data in the transmit direction.
vide a ground reference on TRING for 75
coax E1 applications.
1:1
1:1
37.5
R1-R2
60
CDB61318
R3-R4
15
15
5