CS61305A-IL1 Cirrus Logic, Inc., CS61305A-IL1 Datasheet - Page 8

• Manufacturer Part Number: CS61305A-IL1
• Description: T1/E1 line interface
• Manufacturer: Cirrus Logic, Inc.

THEORY OF OPERATION
Key Enhancements of the CS61305A Relative
to the LXT305A
Introduction to Operating Modes
The CS61305A supports three operating modes
which are selected by the level of the MODE pin
as shown in Tables 1 and 2, Figure 7, and Figures
A1-A3 of the Applications section.
There are thirteen multi-function pins whose
functionality is determined by the operating
mode. (see Table 2). The modes are Hardware
Mode, Extended Hardware Mode, and Host
Mode. In Hardware and Extended Hardware
Modes, discrete pins are used to configure and
monitor the device. The Extended Hardware
Mode provides a parallel chip select input which
latches the control inputs allowing individual ICs
to be configured using a common set of control
lines. In the Host Mode, an external processor
monitors and configures the device through a se-
rial interface.
8
12.5% lower power consumption,
50 mA
limiting for E1 (per OFTEL OTR-001),
Optional AMI, B8ZS, HDB3 encoder/de-
coder or external line coding support,
Receiver AIS (unframed all ones) detection,
Improved receiver Loss of Signal handling
(LOS set at power-up, reset upon receipt of
3 ones in 32 bit periods with no more than
15 consecutive zeros),
Transmitter TTIP and TRING outputs are
forced low when TCLK is static.
RMS
transmitter short-circuit current
Performance
RECEIVER/DPM
TRANSMITTER
Detection
Monitor
FUNCTION
Control
CONTROL
Method
MODE
Coding
Driver
Table 1. Differences Between Operating Modes
Level
Line
AIS
Pin
Hardware
Table 2. Pin Definitions
PIN HARDWARE
17
18
18
23
24
25
26
27
28
11
External
3
4
6
7
Control
<0.2 V
Mode
Pins
Yes
No
RLOOP
MRING
LLOOP
RNEG
RPOS
TPOS
TNEG
TAOS
LEN0
LEN1
LEN2
MTIP
DPM
-
Control Pins
AMI, B8ZS,
with Parallel
Chip Select
Hardware
Floating or
Extended
or HDB3
Internal-
Mode
2.5 V
HARDWARE
Yes
EXTENDED
No
RCODE
CS61305A
TCODE
RLOOP
LLOOP
TDATA
RDATA
MODE
TAOS
LEN0
LEN1
LEN2
BPV
PCS
AIS
-
>(RV+)-0.2
Interface
External
DS157PP3
Serial
Mode
Host
Yes
No
MRING
RNEG
RPOS
V
HOST
TPOS
TNEG
SCLK
CLKE
MTIP
DPM
SDO
SDI
INT
CS
-