DS3172N Maxim Integrated, DS3172N Datasheet - Page 158
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DS3172N
Manufacturer Part Number
DS3172N
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172N
Part # Aliases
90-31720-N00
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Bit 3: Transmit Bit Reordering Enable (TBRE) – When 0, bit reordering is disabled (The first bit transmitted is the
LSB of the Transmit FIFO Data byte TFD[0]). When 1, bit reordering is enabled (The first bit transmitted is the MSB
of the Transmit FIFO Data byte TFD[7]).
Bit 2: Transmit Data Inversion Enable (TDIE) – When 0, the outgoing data is directly output from packet
processing. When 1, the outgoing data is inverted before being output from packet processing.
Bit 1: Transmit FCS Processing Disable (TFPD) – This bit controls whether or not an FCS is calculated and
appended to the end of each packet. When 0, the calculated FCS bytes are appended to the end of the packet.
When 1, the packet is transmitted without an FCS.
Bit 0: Transmit FIFO Reset (TFRST) – When 0, the Transmit FIFO will resume normal operations, however, data
is discarded until a start of packet is received after RAM power-up is completed. When 1, the Transmit FIFO is
emptied, any transfer in progress is halted, the FIFO RAM is powered down, and all incoming data is discarded (all
TFDR register writes are ignored).
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Note: The FIFO data and status are loaded into the Transmit FIFO when the Transmit FIFO Data (TFD[7:0]) is
written (upper byte write). When read, the value of these bits is always zero.
Bits 15 to 8: Transmit FIFO Data (TFD[7:0]) – These eight bits are the packet data to be stored in the Transmit
FIFO. TFD[7] is the MSB, and TFD[0] is the LSB. If bit reordering is disabled, TFD[0] is the first bit transmitted, and
TFD[7] is the last bit transmitted. If bit reordering is enabled, TFD[7] is the first bit transmitted, and TFD[0] is the
last bit transmitted.
Bit 0: Transmit FIFO Data Packet End (TDPE) – When 0, the Transmit FIFO data is not a packet end. When 1,
the Transmit FIFO data is a packet end.
TFD7
15
--
0
7
0
TFD6
14
--
0
6
0
HDLC.TFDR
HDLC Transmit FIFO Data Register
(0,2,4,6)A2h
TFD5
13
--
0
5
0
TFD4
12
--
0
0
4
158
TFD3
11
--
0
3
0
TFD2
10
--
0
2
0
TFD1
--
9
0
1
0
TDPE
TFD0
8
0
0
0
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