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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  
072Transmit Frame Format (TFRM)  
TFRM controls the insertion of overhead bits generated by transmit frame and alarm formatters. Bypassed  
overhead bits flow transparently from TPCMI system bus input through TSLIP buffer.  
7
6
5
4
3
2
1
0
INS_MYEL  
INS_YEL  
INS_MF  
INS_FE  
INS_CRC  
INS_FBIT  
INS_MYEL  
Insert Multiframe Yellow AlarmApplicable to E1 modes only. Enables the alarm formatter  
to output Y16 Multiframe Yellow Alarm. Once enabled, TMYEL and AUTO_MYEL [addr  
075] control the alarm output state. This bit must be set to 0 in T1 modes. In ESF framed T1  
mode, the YF Multiframe Yellow Alarm is transmitted by programming the DL1 data link  
controller and transmitting the appropriate bit oriented code message (BOP message).  
0 = bypass  
1 = insert multiframe Yellow Alarm  
INS_YEL  
Insert Yellow AlarmThe alarm formatter outputs Yellow Alarms YB2 or YJ during T1  
modes, or Y0 during E1 modes. Once enabled, TYEL and AUTO_YEL [addr 075] control the  
Yellow Alarm output state. If the system wants to bypass JYEL (Fs bit in frame 12), it must  
bypass all Fs bits with INS_MF [addr 072].  
0 = bypass  
1 = insert Yellow Alarm.  
INS_MF  
INS_FE  
Insert Multiframe AlignmentThe frame formatter outputs 6-bit SF alignment pattern in T1  
mode, or 6-bit MFAS alignment pattern in E1 mode. INS_MF must be set while TFRAME  
(addr 070) selects Fs (T1) or MFAS (E1) alignment.  
0 = bypass  
1 = insert multiframe alignment  
Insert FEBEDuring E1 mode, the alarm formatter automatically outputs TS0 bit 1 of frames  
13 (FEBE13) and 15 (FEBE15) in response to received CRC4 errors. FEBE13 is active low for  
each received CRC4 error detected in SMF I; FEBE15 is active low for each received CRC4  
error detected in SMF II. INS_FE should be set while TFRAME (addr 070) selects FEBE (E1)  
alignment.  
0 = bypass  
1 = insert FEBE  
INS_CRC  
INS_FBIT  
Insert Cyclic Redundancy CheckThe frame formatter outputs the calculated CRC6 bits in  
T1 mode or CRC4 bits in E1 mode.  
0 = bypass  
1 = insert cyclic redundancy check  
Insert Terminal FramingThe frame formatter outputs a 2-bit Ft alignment pattern in F-bits of  
odd frames (SF framing) or FPS framing pattern (ESF framing) during T1 modesor 8-bit  
FAS/NFAS alignment pattern during E1 modes. INS_FBIT should be set while TFRAME  
(addr 070) selects Ft (T1, SF), FPS (T1, ESF), or FAS (E1) alignment.  
NOTE:  
If F-bits are bypassed while TSLIP is enabled, the system must use either embedded  
T1 framing or apply at least a double frame (250 µs) multiframe sync pulse  
(TMSYNC) to provide odd/even frame alignment.  
0 = bypass  
1 = insert terminal framing  
N8370DSE  
Conexant  
3-73