参数资料
型号: DS21FF44N
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封装: 27 X 27 MM, BGA-300
文件页数: 76/110页
文件大小: 526K
代理商: DS21FF44N
DS21FT44/DS21FF44
68 of 110
19.4. 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.
RHR
HCR.6
Receive HDLC Reset. A 0 to 1 transition will reset the
receive 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
transmit 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. The HDLC controller will clear this bit 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)
RPE
RPS
RHALF
RNE
THALF
TNF
TMEND
SYMBOL
POSITION
NAME AND DESCRIPTION
–HSR.7
Not Assigned. Should be set to zero.
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.
相关PDF资料
PDF描述
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