参数资料
型号: XRT73LC00AIVTR
厂商: Exar Corporation
文件页数: 19/61页
文件大小: 0K
描述: IC LIU STS1/DS3/E3 SGL 44TQFP
标准包装: 1,000
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 44-LQFP
供应商设备封装: 44-TQFP(10x10)
包装: 带卷 (TR)
XRT73LC00A
23
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.2
The HOST Mode
To configure the XRT73LC00A to operate in the HOST Mode, connect the HOST/HW input pin (pin 18) to VDD.
When the XRT73LC00A is operating in the HOST Mode, the following is true:
1. The Microprocessor Serial Interface block is enabled. Many configuration selections are made by writing
the appropriate data into the on-chip Command Registers via the Microprocessor Serial Interface.
2. All of the following input pins are disabled:
n
Pin 1 - TXLEV
n
Pin 2 - TAOS
n
Pin 12 - REQDIS
n
Pin 14 - LLB
n
Pin 15 - RLB
n
Pin 16 - STS-1/DS3
n
Pin 17 - E3
n
Pin 35 - TXOFF
Tie each of these pins to GND if the XRT73LC00A IC is to be operated in the HOST Mode.
Please see Section 5.0 for a detailed description on operating the Microprocessor Serial Interface or the on-
chip Command Registers.
1.0
SELECTING THE DATA RATE
The XRT73LC00A can be configured to support the E3 (34.368 Mbps), DS3 (44.736 Mbps) or the SONET
STS-1 (51.84 Mbps) rates. Selection of the data rate is dependent on whether the XRT73LC00A is operating
in the Hardware or HOST Mode.
A. When operating in the Hardware Mode.
To configure the XRT73LC00A for the desired data rate, the E3 and the STS-1/DS3 pins must be set to the
appropriate logic states shown in Table 2.
B. When operating in the HOST Mode.
To configure the XRT73LC00A for the desired data rate, appropriate values need to be written into the STS-1/
DS3 and E3 bit-fields in Command Register CR4.
Table 3 relates the values of these two bit-fields with respect to the selected data rates.
TABLE 2: SELECTING THE DATA RATE FOR THE XRT73LC00A VIA THE E3 AND STS-1/DS3 INPUT PINS (HARDWARE
MODE)
DATA RATE
STATE OF E3 PIN
(PIN 17)
STATE OF STS-1/DS3 PIN
(PIN 16)
MODE OF B3ZS/HDB3 ENCODER/
DECODER BLOCKS
E3 (34.368 Mbps)
VDD
X (Don’t Care)
HDB3
DS3 (44.736 Mbps)
0
B3ZS
STS-1 (51.84 Mbps)
0
VDD
B3ZS
COMMAND REGISTER CR4 (ADDRESS = 0X04)
D4
D3
D2
D1
D0
X
STS-1/DS3
E3
LLB
RLB
X
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