參數(shù)資料
型號： DS21554LN
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, PQFP100
封裝： 14 X 14 MM, LQFP-100
文件頁數(shù)： 78/117頁
文件大小： 698K
代理商： DS21554LN
DS21354 & DS21554
63 of 117
15.4 HDLC Register Description
HCR: HDLC CONTROL REGISTER (Address=B0 Hex)
(MSB)
(LSB)
–
RHR
TFS
THR
TABT
TEOM
TZSD
TCRCD
SYMBOL
POSITION NAME AND DESCRIPTION
–
HCR.7
Not Assigned. Should be set to zero when written.
RHR
HCR.6
Receive HDLC Reset. A 0 to 1 transition will reset the HDLC controller.
Must be cleared and set again for a subsequent reset.
TFS
HCR.5
Transmit Flag/Idle Select.
0 = 7Eh
1 = FFh
THR
HCR.4
Transmit HDLC Reset. A 0 to 1 transition will reset the HDLC
controller. Must be cleared and set again for a subsequent reset.
TABT
HCR.3
Transmit Abort. A 0 to 1 transition will cause the FIFO contents to be
dumped and one FEh abort to be sent followed by 7Eh or FFh flags/idle
until a new packet is initiated by writing new data into the FIFO. Must be
cleared and set again for a subsequent abort to be sent.
TEOM
HCR.2
Transmit End of Message. Should be set to a one just before the last data
byte of a HDLC packet is written into the transmit FIFO at THFR. This bit
will be cleared by the HDLC controller when the last byte has been
transmitted.
TZSD
HCR.1
Transmit Zero Stuffer Defeat. Overrides internal enable.
0 = enable the zero stuffer (normal operation)
1 = disable the zero stuffer
TCRCD
HCR.0
Transmit CRC Defeat.
0 = enable CRC generation (normal operation)
1 = disable CRC generation
HSR: HDLC STATUS REGISTER (Address=B1 Hex)
(MSB)
(LSB)
FRCL
RPE
RPS
RHALF
RNE
THALF
TNF
TMEND
SYMBOL
POSITION NAME AND DESCRIPTION
FRCL
HSR.7
Framer Receive Carrier Loss. Set when 255 (or 2048 if CCR3.0 = 1)
consecutive zeros have been detected at RPOSI and RNEGI.
RPE
HSR.6
Receive Packet End. Set when the HDLC controller detects either the
finish of a valid message (i.e., CRC check complete) or when the
controller has experienced a message fault such as a CRC checking error,
or an overrun condition, or an abort has been seen. The setting of this bit
prompts the user to read the RHIR register for details.
RPS
HSR.5
Receive Packet Start. Set when the HDLC controller detects an opening
byte. The setting of this bit prompts the user to read the RHIR register for
details.
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