DS3172 Maxim Integrated, DS3172 Datasheet - Page 187
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DS3172
Manufacturer Part Number
DS3172
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172
Part # Aliases
90-31720-000
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12.9.3 Transmit G.751 E3
The transmit G.751 E3 utilizes two registers.
12.9.3.1 Register Map
Table 12-25. Transmit G.751 E3 Framer Register Map
12.9.3.2 Register Bit Descriptions
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Bits 9 to 8: Transmit N Bit Control (TNBC[1:0]) – These two bits control the source of the N bit.
Note: If TNBC[1:0] is 10 and TABC[1:0] is 01, both the N bit and A bit will carry the same transmit FEAC controller
(one bit per frame period), however, the N bit and A bit in the same frame may or may not be equal.
Bits 3 to 2: Transmit A Bit Control (TABC[1:0]) – These two bits control the source of the A bit.
Note: If TABC[1:0] is 01 and TNBC[1:0] is 10, both the A bit and N bit will carry the same transmit FEAC controller
(one bit per frame period), however, the A bit and N bit in the same frame may or may not be equal.
Bit 1: Transmit Frame Generation Control (TFGC) – When this bit is zero, the Transmit Frame Processor frame
generation is enabled. The E3 overhead positions in the incoming E3 payload will be overwritten with the internally
generated E3 overhead. When this bit is one, the Transmit Frame Processor frame generation is disabled. The E3
overhead positions in the incoming E3 payload will be passed through to error insertion. Note: The E3 overhead
periods can still be overwritten by overhead insertion.
Bit 0: Transmit Alarm Indication Signal (TAIS) – When 0, the normal signal is transmitted. When 1, the output
E3 data stream is forced to all ones (AIS).
(1,3,5,7)1Ah E3G751.TEIR
(1,3,5,7)1Ch
(1,3,5,7)1Eh
(1,3,5,7)18h
Address
00 = 1
01 = transmit data from HDLC controller.
10 = transmit data from FEAC controller.
11 = 0
00 = automatically generated based upon received E3 alarms.
01 = transmit from the FEAC controller.
10 = 0
11 = 1
Reserved
15
--
0
7
0
E3G751.TCR
Register
14
--
--
0
6
0
--
--
E3G751.TCR
E3 G.751 Transmit Control Register
(1,3,5,7)18h
Reserved
E3 G.751 Transmit Control Register
E3 G.751 Transmit Error Insertion Register
Reserved
Reserved
Register Description
13
--
0
5
0
Reserved
Reserved
12
0
0
4
187
Reserved
TABC1
11
0
3
0
Reserved
TABC0
10
0
2
0
TNBC1
TFGC
9
0
1
0
TNBC0
TAIS
8
0
0
0
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