MX614P 查看數據表（PDF） - MX-COM Inc
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MX614P Datasheet PDF : 19 Pages
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Bell 202 Compatible Modem
FSK Modulator input :
RDY output :
CLK input :
TXD input :
11
MX614 PRELIMINARY INFORMATION
123
tR
12
34
RDY
CLK
TXD
tD
tcHI
tS tH
1
tD = Internal MX614 delay, tR = RDY low to CLK going low, tS = data set up time
tcHI= CLK high time, tH = data hold time
Figure 9: FSK Operation with Tx Data Retiming
To ensure synchronization between the controlling device and the MX614 when entering Tx retiming mode
the TXD pin must be held at a constant logic level from when the CLK pin is first pulled low to the end of
loading in the second retimed bit. Similarly when exiting Tx retiming mode the TXD pin should be held at the
same logic level as the last retimed bit for at least 2 bit times after the CLK line is pulled high.
If the data retiming facility is not required, the CLK input to the MX614 should be kept high at all times. The
asynchronous data to the FSK modulator will then be connected directly to the TXD input pin. This is
illustrated in Figure 10 and will also be the case when transmitting 5bps or 150bps data which has no retime
option.
TXD input :
FSK Modulator input :
N-2 N-1 N N+1 N+2
N-2 N-1 N N+1 N+2
Figure 10: FSK Operation without Tx Data Retiming (CLK always high)
2000 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480162.004
4800 Bethania Station Road, Winston-Salem, NC 27105 USA
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