參數(shù)資料
型號(hào): CS61881
英文描述: Octal E1 Analog Front EndLine Interface Units
中文描述: 八路素E1模擬前端底線接口單元
文件頁(yè)數(shù): 19/28頁(yè)
文件大?。?/td> 461K
代理商: CS61881
CS61881
DS451PP3
19
CBLSEL - Cable Impedance Select, LQFP Pin 93, BGA Pin G13
This pin is used to select the impedance matching network used by all eight transceivers. The
transmitters always make use of an internal cable matching network to eliminate external line
matching component. The receiver can be operated with either internal or external line
matching. The CBLSEL input sets the desired cable matching for the transmitter and configures
the receiver for either internal or external impedance matching. The
Application
section
provides sample schematics for both internal and external RX matching.
Status
ALOS0 - Analog Loss Of Signal Output Port #0, LQFP Pin 42, BGA Pin K4
ALOS0 is asserted “high” to indicate analog loss of signal (LOS) compliant to ITU-T G.775.
ALOS1 - Analog Loss Of Signal Port #1, LQFP Pin 35, BGA Pin K3
ALOS2 - Analog Loss Of Signal Port #2, LQFP Pin 75, BGA Pin K12
ALOS3 - Analog Loss Of Signal Port #3, LQFP Pin 68, BGA Pin K11
ALOS4 - Analog Loss Of Signal Port #4, LQFP Pin 113, BGA Pin E11
ALOS5 - Analog Loss Of Signal Port #5, LQFP Pin 106, BGA Pin E12
ALOS6 - Analog Loss Of Signal Port #6, LQFP Pin 3, BGA Pin E3
ALOS7 - Analog Loss Of Signal Port #7, LQFP Pin 140, BGA Pin E4
RX/TX Data I/O
TCLK0 - Transmit Clock Input, LQFP Pin 36, BGA Pin N1.
If a 2.048MHz transmit clock is input on this pin, the TPOS and TNEG inputs function as NRZ
inputs. In this mode, the falling edge of TCLK samples NRZ encoded data on TPOS and
TNEG.
If TCLK0 is held High, the TPOS and TNEG inputs function as RZ inputs. In this mode, the
transmit pulse width is set by the duty cycle of the signal input on TPOS and TNEG. To enter
this mode, TCLK must be held high for at least 12
μ
S.
If TCLK0 is held low for at least 12
μ
S, the output drivers enter a low-power, high impedance
state.
CBLSEL
No Connect
HIGH
LOW
Cable
120
75
75
TX Match
120
75
75
RX Matching Mode
Supports both Internal and External 120
Matching
Internal 75
Matching
External 75
Matching
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