XR72L52 Datasheet, PDF (112/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L52
REV. 1.0.1
xr
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
NOTE: The XRT72L52 Framer IC will not compute this CRC-7 value. It is up to the user's hardware and/or software to
compute this value, prior to writing it into this register.
2.3.6.8 Transmit E3 TTB-1 Register (E3, ITU-T G.832)
TXE3 TTB-1 REGISTER (ADDRESS = 0X39)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-1[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
This Read/Write byte-field, along with the TxTTB-0 and TxTTB-2 through TxTTB-15 register permit a user to
define a Trail Access Point Identifier sequence of bytes, that will be transmitted to the Remote Terminal. The
Remote Receiving Terminal will use this sequence of bytes to verify that it is connected to the proper Transmit-
ting Terminal. The Transmit DS3/E3 Framer block will take the contents of these 16 registers, and insert them
into the TR byte of the outbound E3 frame. In the second of a set of 16 E3 Frames, the Transmit DS3/E3
Framer block will read in the contents of this register, and insert it into the TR byte-field, within the very next
outbound E3 frame.
The contents of this register, along with Tx TTB-2 through Tx TTB-15 are used to transmit 15 ASCII characters
required for the E.164 numbering format.
2.3.6.9 Transmit E3 TTB-2 Register (E3, ITU-T G.832)
TXE3 TTB-2 REGISTER (ADDRESS = 0X3A)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-2[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
This Read/Write byte-field, along with the TxTTB-0, TxTTB-1 and TxTTB-3 through TxTTB-15 register permit a
user to define a Trail Access Point Identifier sequence of bytes, that will be transmitted to the Remote Terminal.
The Remote Receiving Terminal will use this sequence of bytes to verify that it is connected to the proper
Transmitting Terminal. The Transmit DS3/E3 Framer block will take the contents of these 16 registers, and in-
sert them into the TR byte of the outbound E3 frame. In the third of a set of 16 E3 Frames, the Transmit DS3/
E3 Framer block will read in the contents of this register, and insert it into the TR byte-field, within the very next
outbound E3 frame.
The contents of this register, along with Tx TTB-1, and Tx TTB-3 through Tx TTB-15 are used to transmit 15
ASCII characters required for the E.164 numbering format.
2.3.6.10 Transmit E3 TTB-3 Register (E3, ITU-T G.832)
TXE3 TTB-3 REGISTER (ADDRESS = 0X3B)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-3[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
This Read/Write byte-field, along with the TxTTB-0 through TxTTB-2 and TxTTB-4 through TxTTB-15 regis-
ters permit a user to define a Trail Access Point Identifier sequence of bytes, that will be transmitted to the Re-
mote Terminal. The Remote Receiving Terminal will use this sequence of bytes to verify that it is connected to
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