XRT7250 Datasheet, PDF (93/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
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REV. 1.1.1
(e.g., the first byte within the 16 byte Trail Trace Buffer
Message). The remaining bits: C0 - C6 contain the
CRC-7 value that was calculated over the previous 16
byte Trail Trace Buffer Message.
NOTES:
1. The XRT7250 Framer device will not compute or
verify this CRC-7 value. It is up to the user's hard-
ware and/or software to compute and verify this
value.
2. For more information on the use of this register,
please see Section 5.3.2.9.
2.3.3.12 Receive E3 TTB-1 Register (E3, ITU-T
G.832)
RXE3 TTB-1 REGISTER (ADDRESS = 0X1D)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RxTTB-1
RO
RO
RO
RO
RO
RO
RO
RO
0
0
0
0
0
0
0
0
This Read-Only register contains the second (2nd)
byte within the 16 byte Trail Trace Buffer Message,
that has been received from the Far-End Terminal.
This register typical contains an ASCII character that
is required for the E.164 numbering format.
NOTE: For more information on the use of this register,
please see Section 5.3.2.9.
2.3.3.13 Receive E3 TTB-2 Register (E3, ITU-T
G.832)
RXE3 TTB-2 REGISTER (ADDRESS = 0X1E)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RxTTB-2
RO
RO
RO
RO
RO
RO
RO
RO
0
0
0
0
0
0
0
0
This Read-Only register contains the third (3rd) byte
within the 16 byte Trail Trace Buffer Message, that
has been received from the Far-End Terminal. This
register typical contains an ASCII character that is re-
quired for the E.164 numbering format.
NOTE: For more information on the use of this register,
please see Section 5.3.2.9.
2.3.3.14 Receive E3 TTB-3 Register (E3, ITU-T
G.832)
RXE3 TTB-3 REGISTER (ADDRESS = 0X1F)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RxTTB-3
RO
RO
RO
RO
RO
RO
RO
RO
0
0
0
0
0
0
0
0
This Read-Only register contains the fourth (4th) byte
within the 16 byte Trail Trace Buffer Message, that
has been received from the Far-End Terminal. This
register typical contains an ASCII character that is re-
quired for the E.164 numbering format.
NOTE: For more information on the use of this register,
please see Section 5.3.2.9.
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