XRT72L54 Datasheet, PDF (398/484 Pages) Exar Corporation – FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
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PRELIMINARY
TABLE 76: THE RELATIONSHIP BETWEEN THE NUMBER OF TXOHENABLE PULSES (SINCE THE LAST OCCURRENCE OF
THE TXOHFRAME PULSE) TO THE E3 OVERHEAD BIT, THAT IS BEING PROCESSED BY THE XRT72L54
NUMBER OF TXOHENABLE PULSES
THE OVERHEAD BIT EXPECTED BY THE CAN THIS OVERHEAD BIT BE ACCEPTED BY
XRT72L54
THE XRT72L54?
0 (Clock edge is coincident with TxO-
FA1 Byte - Bit 7
Yes
HFrame being detected “High”)
1
FA1 Byte - Bit 6
No
2
FA1 Byte - Bit 5
No
3
FA1 Byte - Bit 4
No
4
FA1 Byte - Bit 3
No
5
FA1 Byte - Bit 2
No
6
FA1 Byte - Bit 1
No
7
FA1 Byte - Bit 0
No
8
FA2 Byte - Bit 7
No
9
FA2 Byte - Bit 6
No
10
FA2 Byte - Bit 5
No
11
FA2 Byte - Bit 4
No
12
FA2 Byte - Bit 3
No
13
FA2 Byte - Bit 2
No
14
FA2 Byte - Bit 1
No
15
FA2 Byte - Bit 0
No
16
EM Byte - Bit 7
No
17
EM Byte - Bit 6
No
18
EM Byte - Bit 5
No
19
EM Byte - Bit 4
No
20
EM Byte - Bit 3
No
21
EM Byte - Bit 2
No
22
EM Byte - Bit 1
No
23
EM Byte - Bit 0
No
24
TR Byte - Bit 7
Yes
25
TR Byte - Bit 6
Yes
26
TR Byte - Bit 5
Yes
27
TR Byte - Bit 4
Yes
28
TR Byte - Bit 3
Yes
29
TR Byte - Bit 2
Yes
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