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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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RS8953B/8953SPB  
4.0 Registers  
HDSL Channel Unit  
4.4 HDSL Receive  
0x60—Receive Command Register 1 (RCMD_1)  
7
6
5
4
3
2
1
0
FRAMER_EN[1:0]  
LOSS_SYNC[2:0]  
REACH_SYNC[2:0]  
REACH_SYNC[2:0] Reach Sync Framing Criteria—Contains the number of consecutive HDSL frames in which  
the SYNC word is detected before the receive framer moves from the OUT_OF_SYNC to the  
IN_SYNC state. REACH_SYNC determines the number of SYNC_ACQUIRED intermediate  
states the framer must pass through during recovery of frame sync. ETSI standard criteria  
requires two consecutive frames containing SYNC.  
REACH_SYNC  
IN_SYNC Criteria  
1 frame containing SYNC  
2 consecutive frames  
3 consecutive frames  
4 consecutive frames  
5 consecutive frames  
6 consecutive frames  
7 consecutive frames  
8 consecutive frames  
000  
001  
010  
011  
100  
101  
110  
111  
LOSS_SYNC[2:0] Loss of Sync Framing Criteria—Contains the number of consecutive HDSL frames in which  
the SYNC word is not detected before the receive framer moves from the IN_SYNC to the  
OUT_OF_SYNC state. LOSS_SYNC determines the number of SYNC_ERRORED  
intermediate states the framer must pass through during loss of frame sync. ETSI standard  
criteria requires six consecutive frames without SYNC word detected.  
LOSS_SYNC  
OUT_OF_SYNC Criteria  
1 frame not containing SYNC  
2 consecutive frames  
3 consecutive frames  
4 consecutive frames  
5 consecutive frames  
6 consecutive frames  
7 consecutive frames  
8 consecutive frames  
000  
001  
010  
011  
100  
101  
110  
111  
FRAMER_EN[1:0] Receive Framer Enable—Instructs the receive framer to search for one or both of the SYNC  
word patterns programmed in SYNC_WORD_A [addr 0xCB] or SYNC_WORD_B [addr  
0xCC]. If enabled to search for both, then the SYNC acquisition state proceeds with only the  
first detected pattern. When disabled, the framer does not count errors or generate interrupts.  
FRAMER_EN  
Receive Framer Search  
Disabled; framer forced to OUT_OF_SYNC  
SYNC_WORD_A  
SYNC_WORD_B  
Both SYNC_WORD_A and SYNC_WORD_B  
00  
01  
10  
11  
N8953BDSB  
Conexant  
4-19