XRT72L13 Datasheet, PDF (273/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
TABLE 17: THE RELATIONSHIP BETWEEN THE NUMBER OF “TXOHENABLE” PULSES (SINCE THE LAST OCCURRENCE
OF THE “TXOHFRAME” PULSE) TO THE DS3 OVERHEAD BIT, THAT IS BEING PROCESSED BY THE XRT72L13
NUMBER OF “TXOHENABLE” PULSES
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
THE OVERHEAD BIT EXPECTED BY THE
"XRT72L13"
F0
FEBE
F1
M0
F1
DL
F0
DL
F0
DL
F1
M1
F1
UDL
FO
UDL
FO
UDL
F1
M0
F1
UDL
F0
UDL
F0
UDL
F1
CAN THIS OVERHEAD BIT BE ACCEPTED
BY THE XRT72L13?
No
Yes
No
No
No
Yes
No
Yes
No
Yes
No
No
No
Yes
No
Yes
No
Yes
No
No
No
Yes
No
Yes
No
Yes
No
3. After the Terminal Equipment has waited through
the appropriate number of pulses via the "TxO-
HEnable" pin, it should then assert the "TxOHIns"
input signal. Concurrently, the Terminal Equip-
ment should also place the appropriate value (of
the inserted overhead bit) onto the "TxOH" sig-
nal.
4. The Terminal Equipment should hold both the
"TxOHIns" input pin "high" and the value of the
"TxOH" signal stable, until the next "TxOHEn-
able" pulse is detected.
261