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BT8375EPF 参数 Datasheet PDF下载

BT8375EPF图片预览
型号: BT8375EPF
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片收发器T1 / E1和综合业务数字网( ISDN )基本速率接口 [single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces]
分类和应用: 电信集成电路综合业务数字网
文件页数/大小: 323 页 / 1950 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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Bt8370/8375/8376  
Fully Integrated T1/E1 Framer and Line Interface  
3.12 Transmitter Registers  
071Transmitter Configuration (TCR1)  
7
6
5
4
3
2
1
0
TNRZ  
TABORT  
TFORCE  
TLOFC  
TLOFB  
TLOFA  
TZCS[1]  
TZCS[0]  
TNRZ  
Transmit NRZ DataTransmit dual-rail unipolar outputs TPOSO/TNEGO are replaced by  
non-return to 0 unipolar data (TNRZO) and transmit multiframe sync (MSYNCO). Both  
outputs are clocked on the rising edge of transmitter clock (TCKI). Line encoding of bipolar  
signals on XTIP/XRING is unaffected. MSYNCO active (high) always marks the first bit of  
transmit multiframe according to the selected transmit framer mode.  
0 = TPOSO/TNEGO encoded per TZCS[1:0]  
1 = TPOSO/TNEGO replaced by TNRZO/MSYNCO  
TABORT  
Abort/Disable TX Offline FramerThe offline framer ignores reframe requests from the  
online framer (TLOF) and aborts any in progress TLOF reframe requests. The loss of frame  
status [TLOF; addr 048] is not affected. While TABORT remains active, the offline framer  
responds only to the processor force reframe request (TFORCE). This allows the processor to  
manually control reframe criteria or lock out changes in the current transmit frame alignment.  
0 = normal framer operation  
1 = framer disabled  
TABORT interacts with EMBED [addr 0D0] to select which data stream is examined by  
online and offline transmit framer during embedded framing modes. If EMBED is active,  
TXDATA output from TSLIP is examined and used to align the TX timebase; otherwise, the  
TPCMI data stream is examined and used to align the TSB timebase, as defined in Table 3-19.  
Table 3-19. Transmit Framer Position  
TABORT  
EMBED  
TSB Alignment  
Tx Alignment  
Tx Framing Mode  
Notes  
0
0
1
0
1
TPCMI  
Flywheel  
TXDATA  
Flywheel  
Transmit Framing  
Embedded Framing  
Normal  
(15)  
(68)  
(5, 6)  
TFSYNC/TMSYNC  
TFSYNC/TMSYNC  
X
NOTE(S):  
(1)  
TFSYNC and TMSYNC must be programmed as outputs.  
(2)  
(3)  
(4)  
(5)  
(6)  
(7)  
(8)  
Offline framer examines TPCMI to supply TSB frame alignment.  
Online framer examines TPCMI to supply TSB multiframe alignment.  
SBI mode must match 2048 k or 1544 k line rate.  
TX timebase flywheels at initial alignment until TSB_CTR or TX_ALIGN [addr 0D4].  
TSB timebase flywheels if TFSYNC/TMSYNC programmed as outputs.  
Offline framer examines TXDATA to supply TX frame alignment.  
Online framer examines TXDATA to supply TX multiframe alignment.  
TFORCE  
Force TX Reframe (auto clear)Forces the offline framer to perform a single reframe,  
according to the selected transmit framer mode. TFORCE is automatically cleared when the  
framer acknowledges a request [ACTIVE; addr 017]. The processor typically does not need to  
force a reframe, because the online framer reframe request (TLOF) is active when reframe  
criteria TLOFCA is met. However, the processor may attempt force a reframe if the frame or  
CRC bit error ratio indicates that the framer has aligned to a mimic pattern.  
0 = no effect  
1 = force TX reframe  
N8370DSE  
Conexant  
3-71