DS3172N Maxim Integrated, DS3172N Datasheet - Page 159
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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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Register Name:
Register Description:
Register Address:
Bit #
Name
Bit #
Name
Bits 13 to 8: Transmit FIFO Fill Level (TFFL[5:0]) – These six bits indicate the number of eight byte groups
available for storage (do not contain data) in the Transmit FIFO. E.g., a value of 21 (15h) indicates the FIFO has
168 (A8h) to 175 (AFh) bytes are available for storage.
Bit 2: Transmit FIFO Full (TFF) – When 0, the Transmit FIFO contains 255 or less bytes of data. When 1, the
Transmit FIFO is full.
Bit 1: Transmit FIFO Empty (TFE) – When 0, the Transmit FIFO contains at least one byte of data. When 1, the
Transmit FIFO is empty.
Bit 0: Transmit HDLC Data Storage Available (THDA) – When 0, the Transmit FIFO has less storage space
available in the Transmit FIFO than the Transmit HDLC data storage available level (TDAL[4:0]). When 1, the
Transmit FIFO has the same or more storage space available than the Transmit FIFO HDLC data storage available
level.
Register Name:
Register Description:
Register Address:
Bit #
Name
Bit #
Name
Bit 5: Transmit FIFO Overflow Latched (TFOL) – This bit is set when a Transmit FIFO overflow condition occurs.
Bit 4: Transmit FIFO Underflow Latched (TFUL) – This bit is set when a Transmit FIFO underflow condition
occurs. An underflow condition results in a loss of data.
Bit 3: Transmit Packet End Latched (TPEL) – This bit is set when an end of packet is read from the Transmit
FIFO.
Bit 1: Transmit FIFO Empty Latched (TFEL) – This bit is set when the TFE bit transitions from 0 to 1.
Note: This bit is also set when HDLC.TCR.TFRST is deasserted.
Bit 0: Transmit HDLC Data Available Latched (THDAL) – This bit is set when the THDA bit transitions from 0 to
1.
Note: This bit is also set when HDLC.TCR.TFRST is deasserted.
15
15
--
--
--
--
7
7
14
14
--
--
--
--
6
6
HDLC.TSR
HDLC Transmit Status Register
(0,2,4,6)A4h
HDLC.TSRL
HDLC Transmit Status Register Latched
(0,2,4,6)A6h
TFFL5
TFOL
13
13
--
--
5
5
TFFL4
TFUL
12
12
--
--
4
4
159
TFFL3
TPEL
11
11
--
--
3
3
TFFL2
TFF
10
10
--
--
2
2
TFFL1
TFEL
TFE
--
9
1
9
1
THDA
THDAL
TFFL0
--
8
0
8
0
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