XRT83L38ES Exar, XRT83L38ES Datasheet - Page 32

• Manufacturer Part Number: XRT83L38ES
• Description: Peripheral Drivers & Components - PCIs
• Manufacturer: Exar

Specifications of XRT83L38ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

XRT83L38
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TRANSMIT HDB3/B8ZS ENCODER
The Encoder function is available in both Hardware and Host modes on a per channel basis by controlling the
TNEG_n/CODES_n pin or CODES interface bit. The encoder is only available in single-rail mode. In E1 mode
and with HDB3 encoding selected, any sequence with four or more consecutive zeros in the input serial data
from TPOS_n/TDATA_n, will be removed and replaced with 000V or B00V, where “B” indicates a pulse
conforming with the bipolar rule and “V” representing a pulse violating the rule. An example of HDB3 Encoding
is shown in
removed and replaced using the B8ZS encoding rule. An example of Bipolar with 8 Zero Substitution (B8ZS)
encoding scheme is shown in
CODES_n pin to a “High” level selects the AMI coding for both E1 or T1 systems.
DRIVER FAILURE MONITOR (DMO)
F
IGURE
TPOS/TDATA
TNEG
12. T
or
TCLK
Table
RANSMIT
HDB3 (case1)
HDB3 (case2)
3. In a T1 system, an input data sequence with eight or more consecutive zeros will be
Input
C
LOCK AND
T
SU
Table
AMI Output
AMI Output
N
C
C
I
B8ZS
B8ZS
T
Input
Input
NPUT
T
UMBER OF PULSE BEFORE NEXT
ASE
ASE
ABLE
4. Writing a “1” into the CODES_n interface bit or connecting the TNEG_n/
ABLE
1
2
D
T
3: E
4: E
ATA
HO
XAMPLES OF
XAMPLES OF
T
P
IMING
RECEDING
even
odd
29
+
+
-
-
P
HDB3 E
B8ZS E
ULSE
4
ZEROS
NCODING
NCODING
N
000VB0VB
000VB0VB
000+ -0- +
000- +0+ -
00000000
00000000
EXT
8 B
ITS
N
EXT
B00V
0000
000V
TCLK
4
BITS
R
TCLK
REV. 1.0.2
F