DS26514G Maxim Integrated, DS26514G Datasheet - Page 259
DS26514G
Manufacturer Part Number
DS26514G
Description
Network Controller & Processor ICs
Manufacturer
Maxim Integrated
Datasheet
1.DS26514G.pdf
(305 pages)
Specifications of DS26514G
Part # Aliases
90-26514-G00
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Register Name:
Register Description:
Register Address:
Bit #
Name
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
Bits 5 to 0: 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.
Register Name:
Register Description:
Register Address:
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 TH256CR1.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 TH256CR1.TFRST is deasserted.
19-5856; Rev 4; 5/11
--
--
--
7
7
7
--
--
--
6
6
6
TH256SR1
Transmit HDLC-256 Status Register 1
1504h + (20h x (n-1)) : where n = 1 to 4
TH256SR2
Transmit HDLC-256 Status Register 2
1505h + (20h x (n-1)) : where n = 1 to 4
TH256SRL
Transmit HDLC-256 Status Register Latched
1506h + (20h x (n-1)) : where n = 1 to 4
TFFL5
TFOL
--
5
5
5
TFFL4
TFUL
--
4
4
4
TFFL3
TPEL
--
3
3
3
DS26514 4-Port T1/E1/J1 Transceiver
TFFL2
TFF
--
2
2
2
TFFL1
TFEL
TFE
1
1
1
THDA
THDAL
TFFL0
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0
0
0
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