w66910 Winbond Electronics Corp America, w66910 Datasheet - Page 28

• Manufacturer Part Number: w66910
• Description: Te Mode Isdn S/t-controller With Microprocessor Interface
• Manufacturer: Winbond Electronics Corp America

7.2.5.6 FAinfD_kfr
This is to test the number k of IX_I4noflag frames necessary for loss of frame alignment.
7.2.5.7 Faregain
This is to test the number m of good frames necessary for regain of frame alignment. The TE regains frame alignment at m+1
frame.
The W66910 achieves synchronization after 5 frames, i.e m=4.
7.2.6 Multiframe Synchronization
As specified by ITU-T I.430, the Q bit is transmitted from TE to NT in the position normally occupied by the auxiliary framing
bit (F
are shown in Table 7.6.
The functions provided by W66910 are:
Device
W66910
Device
W66910
Device
W66910
-
-
-
-
A
) in one frame out of 5, whereas the S bit is transmitted from NT to TE. The S and Q bit positions and multiframe structure
Multiframe synchronization: Synchronization is achived when the M bit pattern has been correctly received during
20 consecutive frames starting from frame number 1.
Note: Criterion for multiframe synchronization is not defined in I.430 Recommendation.
S bits receive and detect: When synchronization is achieved, the four received S bits in frames 1,6,11,16 are stored
as S1 to S4 in the SQR register respectively. A change in the recived four bits (S1-4) is indicated by an interrupt.
Multiframe synchronization monitoring: Multiframe synchronization is constantly monitored. The synchronization
state is indicated by the MSYN bit in the SQR register.
Q bits transmit and F
SQXR register are transmitted as the four Q bits (F
transmitted is a mirror of the received F
bit.
A
mirroring: When multiframe synchronization is achived, the four bits Q1-4 stored in the
Settings
k =2
Settings
k = 2
Settings
m = 4
A
-bit. At loss of synchronization, the mirroring is resumed at the next F
A
-bit position) in frames 1,6,11 and 16. Otherwise the F
-28 -
Result
Pass
Result
Pass
Result
Pass
W66910 PCI ISDN S/T-Controller
Publication Release Date:
Data Sheet
Revision 1.0
A
bit
Feb,2001
A
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