参数资料
型号: XRT83SL34IV
厂商: Exar Corporation
文件页数: 20/80页
文件大小: 0K
描述: IC LIU T1/E1/J1 QUAD 128TQFP
标准包装: 72
类型: 线路接口装置(LIU)
驱动器/接收器数: 4/4
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 128-LQFP
供应商设备封装: 128-TQFP(14x20)
包装: 托盘
XRT83SL34
QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.0
24
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 Table 3. In a T1 system, an input data sequence with eight or more consecutive zeros will be
removed and replaced using the B8ZS encoding rule. An example of Bipolar with 8 Zero Substitution (B8ZS)
encoding scheme is shown in Table 4. Writing a “1” into the CODES_n interface bit or connecting the TNEG_n/
CODES_n pin to a “High” level selects the AMI coding for both E1 or T1 systems.
FIGURE 10. TRANSMIT CLOCK AND INPUT DATA TIMING
TABLE 3: EXAMPLES OF HDB3 ENCODING
NUMBER OF PULSE BEFORE NEXT 4 ZEROS
NEXT 4 BITS
Input
0000
HDB3 (case1)
odd
000V
HDB3 (case2)
even
B00V
TABLE 4: EXAMPLES OF B8ZS ENCODING
CASE 1PRECEDING PULSE
NEXT 8 BITS
Input
+
00000000
B8ZS
000VB0VB
AMI Output
+
000+ -0- +
CASE 2
Input
-
00000000
B8ZS
000VB0VB
AMI Output
-
000- +0+ -
TCLK
R
TCLK
F
TCLK
TPOS/TDATA
or
TNEG
T
SU
T
HO
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