參數(shù)資料
型號: W6692A
英文描述: TE Mode S/T Controller with PCI 2.2 Interface and ACPT
中文描述: TE模S / T的2.2與PCI控制器接口和ACPT
文件頁數(shù): 34/101頁
文件大?。?/td> 851K
代理商: W6692A
W6692A
- 34 -
Layer1-B2 Receive Table
PXC
B1_SW[1:0]
B2_SW[1:0]
L1_B2 Rx
x
xx
00
L2_B2
0
xx
01
PCM2/GCI_B2
1
01
PCM1/GCI_B1
x
xx
10
High
x
xx
11
L2_B2
For examples, if switching connection of Layer1-B1 and PCM2, Layer1-B2 and PCM1 are considered,
then look up the destination as PCM2 from
PCM2/GCI_B2 Receive Table. To achieve above switching
function, chose Layer1-B2 as source, set PXC bit to 1 and set 00 or 01 to B1_SW[1:0]. It is the same procedure
for Layer1-B2/PCM1 by searching PCI/GCI_B1 Receive table, seting PXC bit to 1 and seting 00 or 01 to
B2_SW[1:0]. There are many switching combinations, and varieties of switching functions are easily
programmed.
7.5 PCM Port
There are two PCM ports in W6692A. Data is valid when respective PFCK is HIGH. The frame
synchronization clocks (PFCK1-2) are 8 KHz and the bit synchronization clock (PBCK) is 1.536 MHz.
7.6 D Channel HDLC Controller
There are two HDLC protocols that are used for ISDN layer 2 functions: LAPD and LAPB. Their frame
formats are shown below.
LAPB modulo 8:
Flag
(1 octet)
Address
(1octet)
Control
(1octet)
Information
(0 or N octets)
FCS
(2 octets)
Flag
(1 octet)
Control field bits
7
6
5
4
3
2
1
0
I frame
N(R)
P
N(S)
0
S frame
N(R)
P/F
S
S
0
1
U frame
M
M
M
P/F
M
M
1
1
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