參數(shù)資料
型號： DS21FT40
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 58/87頁
文件大?。?/td> 386K
代理商： DS21FT40
DS21FT40
58 of 87
Transmit a HDLC Message
1.
Make sure HDLC controller is done sending any previous messages and is current sending flags by
checking that the FIFO is empty by reading the TEMPTY status bit in the THIR register.
2.
Enable either the THALF or TNF interrupt.
3.
Read THIR to obtain TFULL status.
A. If TFULL=0, then write a byte into the FIFO and skip to next step (special case occurs when
the last byte is to be written, in this case set TEOM=1 before writing the byte and then skip to
step 6)
B. If TFULL=1, then skip to step 5
4.
Repeat step 3.
5.
Wait for interrupt, skip to step 3.
6.
Disable THALF or TNF interrupt and enable TMEND interrupt.
7.
Wait for an interrupt, then read TUDR status bit to make sure packet was transmitted correctly.
14.4 HDLC REGISTER DESCRIPTION
HCR: HDLC CONTROL REGISTER (Address=B0 Hex)
(MSB)
–
RHR
TFS
(LSB)
TCRCD
THR
TABT
TEOM
TZSD
SYMBOLS
POSITION
NAME AND DESCRIPTION
–
HCR.7
HCR.6
Not Assigned. Should be set to zero.
Receive HDLC Reset. A 0 to 1 transition will reset the receive
HDLC controller. Must be cleared and set again for a
subsequent reset.
Transmit Flag/Idle Select.
0 = 7Eh.
1 = FFh.
Transmit HDLC Reset. A 0 to 1 transition will reset the
transmit HDLC controller. Must be cleared and set again for a
subsequent reset.
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.
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.
Transmit Zero Stuffer Defeat. Overrides internal enable.
0 = enable the zero stuffer (normal operation).
1 = disable the zero stuffer.
Transmit CRC Defeat.
0 = enable CRC generation (normal operation).
1 = disable CRC generation.
RHR
TFS
HCR.5
THR
HCR.4
TABT
HCR.3
TEOM
HCR.2
TZSD
HCR.1
TCRCD
HCR.0
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參數(shù)描述
DS21FT40N 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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DS21FT44+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 4X3 E1 Framer E1 Framer E1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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