ds26519 Maxim Integrated Products, Inc., ds26519 Datasheet - Page 84
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ds26519
Manufacturer Part Number
ds26519
Description
Ds26519 16-port T1/e1/j1 Transceiver
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS26519.pdf
(310 pages)
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9.10
9.10.1 Receive HDLC Controller
This device has an enhanced HDLC controller that can be mapped into a single time slot, or Sa4 to Sa8 bits (E1
mode), or the FDL (T1 mode). The HDLC controller has 64-byte FIFO buffer in both the transmit and receive paths.
The user can select any specific bits within the time slot(s) to assign to the HDLC controller, as well as specific Sa
bits (E1 mode).
The HDLC controller performs all the necessary overhead for generating and receiving performance report
messages (PRM) as described in ANSI T1.403 and the messages as described in AT&T TR54016. The HDLC
controller automatically generates and detects flags, generates and checks the CRC check sum, generates and
detects abort sequences, stuffs and destuffs zeros, and byte aligns to the data stream. The 64-byte buffers in the
HDLC controller are large enough to allow a full PRM to be received or transmitted without host intervention.
Table 9-36
Table 9-36. Registers Related to the HDLC
Receive HDLC Control Register (RHC)
Receive HDLC Bit Suppress Register
(RHBSE)
Receive HDLC FIFO Control Register
(RHFC)
Receive HDLC Packet Bytes Available
Register (RHPBA)
Receive HDLC FIFO Register (RHF)
Receive Real-Time Status Register 5
(RRTS5)
Receive Latched Status Register 5 (RLS5)
Receive Interrupt Mask Register 5 (RIM5)
Transmit HDLC Control Register 1(THC1)
Transmit HDLC Bit Suppress Register
(THBSE)
Transmit HDLC Control Register 2 (THC2)
Transmit HDLC FIFO Control Register
(THFC)
Transmit Real-Time Status Register 2
(TRTS2)
Transmit HDLC Latched Status Register 2
(TLS2)
Transmit Interrupt Mask Register 2 (HDLC)
Register (TIM2)
Transmit HDLC FIFO Buffer Available
Register (TFBA)
Transmit HDLC FIFO Register (THF)
Note: The addresses shown are for Framer 1.
HDLC Controllers
shows the registers related to the HDLC.
REGISTER
ADDRESSES
FRAMER 1
84 of 310
0B5h
0B6h
0B4h
0A4h
1B1h
1A1h
1B3h
1B4h
010h
011h
087h
094h
110h
111h
113h
187h
191h
Mapping of the HDLC to DS0 or FDL.
Receive HDLC bit suppression register.
Determines the length of the receive HDLC
FIFO.
Tells the user how many bytes are available in
the teceive HDLC FIFO.
The actual FIFO data.
Indicates the FIFO status.
Latched status.
Interrupt mask for interrupt generation for the
latched status.
Miscellaneous transmit HDLC control.
Transmit HDLC bit suppress for bits not to be
used.
HDLC to DS0 channel selection and other
control.
Used to control the transmit HDLC FIFO.
Indicates the real-time status of the transmit
HDLC FIFO.
Indicates the FIFO status.
Interrupt mask for the latched status.
Indicates the number of bytes that can be
written into the transmit FIFO.
Transmit HDLC FIFO.
DS26519 16-Port T1/E1/J1 Transceiver
FUNCTION
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