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參數資料
型號: W6691
廠商: WINBOND ELECTRONICS CORP
英文描述: ISDN S/T Interface Transceiver
中文描述: 綜合業務數字網的S / T接口收發器
文件頁數: 44/106頁
文件大小: 428K
代理商: W6691
Preliminary W6691
Publication Release Date: Sep 2001
44 Revision 1.1
1st octet
2nd octet
Control field bits
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
I frame
N(S)
0
N(R)
P/F
S frame
0
0
0
0
S
S
0
1
N(R)
P/F
U frame
M
M
M
P/F
M
M
1
1
7.5.1 D Channel Message Transfer Modes
The D channel HDLC controller operates in transparent mode.
Chracteristics:
- Receive frame address recognition
- Address comparison maskable bit-by-bit
- Flag generation / deletion
- Zero bit insertion/ deletion
- Frame Check Sequence (FCS) generation/ check with CRC_ITU-T
Note
. The LAPD protocol uses the CRC_ITU-T for Frame Check Sequence. The polynominal is X
16
+ X
12
+ X
5
+ 1.
For address recognition, the W6691 provides four programmable registers for individual SAPI and TEI
values, SAP1-2 and TEI1-2, plus two fixed values for group SAPI and TEI, SAPG and TEIG. The SAPG equals
02H(C/R=1) or 00H(C/R=0) which corresponds to SAPI = 0. The TEIG equals FFH which corresponds to TEI =
127. Incoming frame with 1
st
address octet= (SAP1 or SAP2 or SAPG) and 2
nd
address octet= (TEI1 or TEI2 or
TEIG) will be stored in the receive FIFO, with flag and FCS fields being discarded and stuffed bits being
removed.
相關PDF資料
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