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參數(shù)資料
型號(hào): W6690
廠商: WINBOND ELECTRONICS CORP
英文描述: ISDN S/T Interface Controller(ISDN S/T接口控制器)
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)的S / T接口控制器(綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口控制器)
文件頁數(shù): 30/76頁
文件大小: 471K
代理商: W6690
Preliminary W6690
- 30 -
LAPD: modulo 128 only
Flag
(1 octet)
Address
(2 octets)
Control
(2 octets)
Information
(0 or N octets)
FCS
(2 octets)
Flag
(1 octet)
1st
octet
2nd
octet
Control field bits
7
6
5
4
3
2
1
0
0
7
6
5
4
3
2
1
0
I frame
N(S)
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
7.6.1 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 W6690 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 FEH or FCH which corresponds to SAPI = 63 for layer management procedure. The
TEIG equals FFH which corresponds to TEI = 127 for automatic TEI assignment procedure. The
address combinations are:
SAP1 + TEI1
SAP1 + FFH
SAP2 + TEI2
SAP2 + FFH
FEH (FCH) + TEI1
FEH (FCH) + TEI2
FEH (FCH) + FFH
The receive frame address comparisons can be disabled (masked) per bit basis with the D_SAM and
D_TAM registers, but comparisons with the SAPG or TEIG cannot be disabled.
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