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參數(shù)資料
| 型號： | TP3420AV |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | ISDN S/T Interface Device |
| 中文描述： | DATACOM, DIGITAL SLIC, PQCC20 |
| 封裝： | PLASTIC, LCC-20 |
| 文件頁數(shù)： | 30/32頁 |
| 文件大小： | 524K |
| 代理商： | TP3420AV |
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SC1 Messaging Sequence
(Continued)
Time
(ms)
SC1
Actions Required
I430 Frame Content
(LRS)
0 (MFC INT)
if FL__EXT flag set, do not check for new flags on SC1L, but check for
SC2 channel. Reset FL__EXT. Send SC2 command as appropriate.
SC1L__NB (IDLE)
>
MFT1L
5
10
15
20
25
0 (MFC INT)
(LRS)
(LRS)
(LRS)
(LRS)
(LRS)
(IDLE)
if FL__EXT flag not set, check for new flags on SC1L, assume LB1I.
Check for SC2 channel. Send SC2 command as appropriate.
SC1__NB(IDLE)
>
SC1__PB, SC1 command (LBL1I)
>
SC1__NB,
SC1__NB(LB1I)
>
MFT1L.
5
10
15
20
25
0 (MFC INT)
(IDLE)
(IDLE)
(IDLE)
(IDLE)
(IDLE)
(LB1I)
if FL__EXT flag not set, Check for new flags on SC1L assume LB2I.
Check for SC2 channel. Send SC2 command as appropriate.
SC1__NB(LB1I)
>
SC1__PB, SC1 command(LB2I)
>
SC1__NB,
SC1__NB(LB2I)
>
MFT1L
5
10
15
20
25
0 (MFC INT)
(LB1I)
(LB1I)
(LB1I)
(LB1I)
(LB1I)
(LB2I)
if FL__EXT flag not set, check for new flags on SC1L, assume IDLE.
Check for SC2 channel. Send SC2 command as appropriate.
SC1__NB(LB2I)
>
SC1__PB, SC1 command (IDLE)
>
SC1__NB
SC1__ NB(IDLE)
>
MFT1L.
5
10
15
20
25
0 (MFC INT)
(LB2I)
(LB2I)
(LB2I)
(LB2I)
(LB2I)
(IDLE)
etc.
On the
TE receive side,
the LP, DTSE and FECV messages
are checked once, and for
every occurrence an interrupt
is generated
. The other messages are validated 3 times be-
fore an interrupt is generated. Subsequent repetitions of the
command do not cause an interrupt.
SC2 CHANNEL TRANSMITTER HANDLING
The software should keep a list of flags to indicate SC2 com-
mands as defined in the spec.At the 30 ms tick MFC INT, the
software should scan through the list of flags (top down) and,
seeing the first flag, should write the appropriate command
in the MFT2 register and keep the value in SC2__NB (soft-
ware buffer).
On the
TE receive side
, the SC2 command is verified 3
times before an Interrupt is generated. Subsequent repeti-
tions of the command do not cause an interrupt.
www.national.com
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