CS61305A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS61305A Datasheet PDF : 44 Pages
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THEORY OF OPERATION
Key Enhancements of the CS61305A Relative
to the LXT305A
• 12.5% lower power consumption,
• 50 mARMS transmitter short-circuit current
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.
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.
CS61305A
Control
Method
MODE
Pin
Level
Line
Coding
AIS
Detection
Driver
Performance
Monitor
Hardware
Mode
Control
Pins
<0.2 V
External
No
Yes
Extended
Hardware
Mode
Control Pins
with Parallel
Chip Select
Floating or
2.5 V
Host
Mode
Serial
Interface
>(RV+)-0.2
V
Internal-
AMI, B8ZS,
or HDB3
Yes
External
No
No
Yes
Table 1. Differences Between Operating Modes
MODE
FUNCTION
EXTENDED
PIN HARDWARE HARDWARE
TRANSMITTER 3
4
TPOS
TNEG
TDATA
TCODE
6
RNEG
BPV
7
RECEIVER/DPM 11
RPOS
DPM
RDATA
AIS
17
MTIP
RCODE
18 MRING
-
18
-
PCS
23
LEN0
LEN0
24
LEN1
CONTROL
25
LEN2
LEN1
LEN2
26 RLOOP
RLOOP
27 LLOOP
LLOOP
28
TAOS
TAOS
HOST
TPOS
TNEG
RNEG
RPOS
DPM
MTIP
MRING
-
INT
SDI
SDO
CS
SCLK
CLKE
Table 2. Pin Definitions
8
DS157PP3
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