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| 型号： | IDT82V2041EPP8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 24/75页 |
| 文件大小： | 0K |
| 描述： | IC LIU T1/J1/E1 1CH 44-TQFP |
| 标准包装： | 1,250 |
| 类型： | 线路接口装置（LIU） |
| 规程： | E1 |
| 电源电压： | 3.13 V ~ 3.47 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) |
| 其它名称： | 82V2041EPP8 |
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IDT82V2041E
SINGLE CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
Functional Description
30
December 9, 2005
Figure-15 Remote Loopback
3.8.4
INBAND LOOPBACK
When PATT[1:0] bits (MAINT0, 0DH) are set to ‘11’, the IDT82V2041E
isconfiguredinInbandLoopbackmode.Inthismode,anunframedactivate/
Deactivate Loopback Code is generated repeatedly in transmit direction
per ANSI T1. 403 which overwrite the transmit signals. In receive direction,
theframedorunframedcodeisdetectedperANSIT1.403,eveninthepres-
ence of 10-2 bit error rate.
If the Automatic Remote Loopback is enabled by setting ARLP bit
(MAINT1, 0EH) to ‘1’, the chip will establish/demolish the Remote Loop-
back based on the reception of the Activate Loopback Code/Deactivate
Loopback Code for 5.1 s. If the ARLP bit (MAINT1, 0EH) is set to ‘0’, the
Remote Loopback can also be demolished forcedly.
3.8.4.1 TRANSMIT ACTIVATE/DEACTIVATE LOOPBACK CODE
The pattern of the transmit Activate/Deactivate Loopback Code is
defined by the TIBLB[7:0] bits (MAINT3, 10H). Whether the code repre-
sentsanActivateLoopbackCodeoraDeactivateLoopbackCodeisjudged
by the far end receiver. The length of the pattern ranges from 5 bits to 8 bits,
as selected by the TIBLB_L[1:0] bits (MAINT2, 0FH). The pattern can be
programmed to 6-bit-long or 8-bit-long by repeating itself respectively if it
is 3-bit-long or 4-bit-long. When the PATT[1:0] bits (MAINT0, 0DH) are set
to ‘11’, the transmission of the Activate/Deactivate Loopback Code is initi-
ated. If the PATT_CLK bit (MAINT0, 0DH) is set to ‘0’ and the PATT[1:0]
bits (MAINT0, 0DH) are set to ‘00’, the transmission of the Activate/Deac-
tivate Loopback Code will stop.
The local transmit activate/deactivate code setting should be the same
as the receive code setting in the remote end. It is the same thing for the
other way round.
3.8.4.2 RECEIVE ACTIVATE/DEACTIVATE LOOPBACK CODE
The pattern of the receive Activate Loopback Code is defined by the
RIBLBA[7:0] bits (MAINT4, 11H). The length of this pattern ranges from 5
bits to 8 bits, as selected by the RIBLBA_L [1:0] bits (MAINT2, 0FH). The
pattern can be programmed to 6-bit-long or 8-bit-long respectively by
repeating itself if it is 3-bit-long or 4-bit-long.
The pattern of the receive Deactivate Loopback Code is defined by the
RIBLBD[7:0] bits (MAINT5, 12H). The length of the receive Deactivate
Loopback Code ranges from 5 bits to 8 bits, as selected by the
RIBLBD_L[1:0] bits (MAINT2, 0FH). The pattern can be programmed to 6-
bit-long or 8-bit-long respectively by repeating itself if it is 3-bit-long or 4-
bit-long.
After the Activate Loopback Code has been detected in the receive data
for more than 30 ms (in E1 mode) / 40 ms (in T1/J1 mode), the IBLBA_S
bit (STAT0, 17H) will be set to ‘1’ to declare the reception of the Activate
Loopback Code.
After the Deactivate Loopback Code has been detected in the receive
dataformorethan30ms(InE1mode)/40ms(InT1/J1mode),theIBLBD_S
bit (STAT0, 17H) will be set to ‘1’ to declare the reception of the Deactivate
Loopback Code.
When the IBLBA_IES bit (INTES, 16H) is set to ‘0’, only the ‘0’ to ‘1’ tran-
sition of the IBLBA_S bit will generate an interrupt and set the IBLBA_IS bit
(INTS0, 19H) to ‘1’. When the IBLBA_IES bit is set to ‘1’, any changes of
the IBLBA_S bit will generate an interrupt and set the IBLBA_IS bit (INTS0,
19H) to ‘1’. The IBLBA_IS bit will be reset to ‘0’ after being read.
When the IBLBD_IES bit (INTES, 16H) is set to ‘0’, only the ‘0’ to ‘1’ tran-
sition of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS
bit (INTS0, 19H) to ‘1’. When the IBLBD_IES bit is set to ‘1’, any changes
of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS bit
(INTS0, 19H) to ‘1’. The IBLBD_IS bit will be reset to ‘0’ after being read.
B8ZS/
HDB3/AMI
Encoder
Jitter
Attenuator
B8ZS/
HDB3/AMI
Decoder
Jitter
Attenuator
Data
Slicer
Adaptive
Equalizer
LOS/AIS
Detection
Clock and
Data
Recovery
Receiver
Internal
Termination
TCLK
TDN
TD/TDP
RCLK
CV/RDN
LOS
RD/RDP
RRING
TTIP
TRING
RTIP
Remote
Loopback
Line
Driver
Waveform
Shaper
Transmitter
Internal
Termination
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