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RS8953BEPJ 参数 Datasheet PDF下载

RS8953BEPJ图片预览
型号: RS8953BEPJ
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  
4.6 PCM Formatter  
HDSL Channel Unit  
0xC0—TSER Frame Bit Location (TFRAME_LOC_LO)  
TFRAME_LOC and TMF_LOC work in conjunction to define the location of bit 0, frame 0, at the TSER data  
input with respect to TMSYNC.  
7
6
5
4
3
2
1
0
TFRAME_LOC[7:0]  
0xC1—TSER Frame Bit Location (TFRAME_LOC_HI)  
7
6
5
4
3
2
1
0
TFRAME_LOC[8]  
TFRAME_LOC[8:0] TSER Frame Bit Location—Establishes the number of PCM bit delays, in the range of 1 to 512  
bits, from the rising edge of TMSYNC until PCM bit 0 is sampled on TSER. A value of 0  
delays TMSYNC by three TCLK periods. If TMSYNC and TSER are input aligned, where  
TMSYNCs rising edge coincides with TSER input of PCM bit 0, then TFRAME_LOC is  
programmed to equal the PCM frame length minus three. The following examples assume  
TMSYNC and TSER are input aligned:  
PCM Frame Length  
E1 = 256 bits  
TFRAME_LOC[8:0] = Decimal (hex)  
253 (0x0FD)  
T1 = 193 bits  
190 (0x0BE)  
64x64 = 512 bits  
509 (0x1FD)  
0xC2—TSER Multiframe Bit Location (TMF_LOC)  
7
6
5
4
3
2
1
0
TMF_LOC[5]  
TMF_LOC[5:0]  
TSER Multiframe Bit Location—TMF_LOC sets the number of frame delays, in the range of  
1 to 64 frames, from TMSYNC (delayed by TFRAME_LOC) until PCM frame 0 is present on  
TSER. A value of 0 delays TMSYNC by one PCM frame. If TMSYNC and TSER are input  
aligned, TMF_LOC is programmed to equal the multiframe length minus two. The following  
examples assume TMSYNCs rising edge coincides with PCM frame 0 input on TSER:  
PCM Multiframe Length  
E1 = 16 frames  
TMF_LOC[5:0] = Decimal (hex)  
14 (0x0E)  
SF = 12 frames  
10 (0x0A)  
ESF = 24 frames  
22 (0x16)  
0xC3—RSER Frame Bit Location (RFRAME_LOC_LO)  
RFRAME_LOC and RMF_LOC work in conjunction to define which RSER bit and frame location is marked  
by the RMSYNC output. Typically, RMSYNC is used as a PCM multiframe sync signal and is programmed to  
mark during RSER output of bit0, frame0. However, any RSER bit location within the received multiframe can  
be marked as desired.  
4-26  
Conexant  
N8953BDSB