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RS8953SPBEPJ 参数 Datasheet PDF下载

RS8953SPBEPJ图片预览
型号: RS8953SPBEPJ
PDF下载: 下载PDF文件 查看货源
内容描述: 高比特率数字用户线( HDSL )信道单元 [High-Bit-Rate Digital Subscriber Line (HDSL) channel unit]
分类和应用: 电信集成电路
文件页数/大小: 173 页 / 1229 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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4.0 Registers  
RS8953B/8953SPB  
4.10 Data Path Options  
HDSL Channel Unit  
The following configuration can cause the HDSL frame to become corrupted:  
DBank_1, DBank_2, or DBank_3 is the source of data for HDSL payload byte 33.  
DBank_2 is the source of data for HDSL payload byte 0.  
The LSB of the DBank_2 pattern is equal to one (1).  
0xDE—Data Bank Pattern 3 (DBANK_3)  
7
6
5
4
3
2
1
0
DBANK_3[7:0]  
DBANK_3[7:0]  
Data Bank Pattern 3—Holds a third possible 8-bit pattern for transmit or receive insertion. See  
DBANK_1 above. If RSIG_EN = 1 [CMD_6; addr 0xF3], DBANK_3 is a receive signaling  
buffer and is not available as an alternate source for receive PCM timeslots. If TAUX_EN = 1  
[TCMD_2; addr 0x07], DBANK_3 is a transmit auxiliary channel data buffer and is not  
available for insertion into transmit HDSL payload bytes but remains available for insertion  
into RSER timeslots.  
The following configuration can cause the HDSL frame to become corrupted:  
DBank_1, DBank_2, or DBank_3 is the source of data for HDSL payload byte 33.  
DBank_3 is the source of data for HDSL payload byte 0.  
The LSB or the DBank_3 pattern is equal to one (1).  
0xEA—Fill Pattern (FILL_PATT)  
7
6
5
4
3
2
1
0
FILL_PATT[7:0]  
FILL_PATT[7:0]  
Fill Pattern—When PRBS_DIS [CMD_3; addr 0xE7] is set, FILL_PATT replaces the PRBS  
generator output with its 8-bit programmable pattern. The transmit Routing Table  
[ROUTE_TBL; addr 0xED] may then select FILL_PATT as a fourth possible data bank to fill  
idle or unpopulated PCM timeslots and HDSL payload bytes. In this case, FILL_PATT also  
establishes an 8-bit pattern checked by the receivers BER meter when enabled [BER_EN in  
COMBINE_TBL; addr 0xEE].  
When PRBS_DIS is zero (PRBS enabled), FILL_PATT is used to initialize the least  
significant byte of the PRBS generators LFSR. In this case, FILL_PATT must be initialized to  
any non-zero value before the MPU issues the PRBS_RST command.  
0xE4—Transmit Stuff Bit Value (TSTUFF)  
7
6
5
4
3
2
1
0
TSTUFF[3:0]  
MAG1  
SIGN1  
MAG0  
SIGNO  
TSTUFF[3:0]  
Transmit Stuffing Bits—Contains the 4-bit STUFF value used by all HDSL transmitters when  
any HDSL output frame contains bit stuffing. TSTUFF[0] is the sign bit and first bit of the  
first quat transmitted during STUFF words.  
4-40  
Conexant  
N8953BDSB