參數(shù)資料
型號(hào)： XRT4500
廠(chǎng)商： Exar Corporation
英文描述： MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
中文描述： 多協(xié)議串行網(wǎng)絡(luò)接口芯片
文件頁(yè)數(shù)： 53/99頁(yè)
文件大?。?/td> 1384K
代理商： XRT4500
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
á
50
The important things to note about Figure 20 are as
follows.
1. The DCE Terminal is the ultimate source of all
clock signals.
2. The DCE Serial Communications Controller (SCC)
will transmit the TXC clock signal to the DTE node.
3. The DTE SCC will update the state on the TXD
line, upon the rising edge of the “incoming” TXC clock
signal when ‘Clock Invert’ is not activated.
4. The DTE SCC will generate the rising edge of the
SCTE clock signal, upon receipt of the rising edge of
the “incoming” TXC clock signal when clock invert is
not activated.
5. The DCE SCC will use the falling edge of the
SCTE clock signal in order to sample the “incoming”
TXD signal.
6. Because the DTE provides the SCTE clock signals
and since the falling edge of this clock signal will oc-
cur at the middle of the bit-period (for the signal on
the TXD line); the “3-Clock DTE/DCE Interface” is
largely immune to the affects of propagation delay
(via the DCE SCC to DTE SCC” link and the “DTE
SCC to DCE SCC” link), and will operate properly
over a very wide range of data rates.
Figure 21 presents an illustration of the wave-forms of
the signals that are transported across a “3-Clock
DTE/DCE” Interface. Further, this figure indicates that
a “3-Clock DTE/DCE” Interface provides the DCE
SCC with a TXD to TXC set-up time of “one-half” of
the bit-period (0.5 * tb). Hence, a “3-Clock DTE/DCE”
Interface can support very wide range of data rates,
and still insure that the DCE SCC will be provided a
sufficient “TXD to TXC” set-up time.
The “2-Clock” DTE/DCE Interface
Although the Data Communications standards rec-
ommends the use of these three clock signals; in
practice, some Data Communications Equipment
manufacturers will build equipment that only supports
the transmission of “2-Clock” signals. The reason for
this can be due to cost, or due to the fact that the Da-
ta Communications Equipment manufacturer is using
an SCC that only handles 2-clock signals. When Data
Communications Equipment Manufacturers design
their DCE or DTE equipment to only support the
transmission of two clocks over the DTE/DCE Inter-
face; these two clocks signals are typically the “TXC”
(Transmit Clock) and the “RXC” (Receive Clock) sig-
nals. Figure 22 presents an illustration of a DTE and
DCE exchanging data over a “2-Clock DCE/DTE” In-
terface.
N
OTE
:
In the “2-Clock DTE/DCE” Interface, the DTE Termi-
nal does not supply the SCTE clock signal back to the DCE.
F
IGURE
21. I
LLUSTRATION
OF
THE
WAVE
-
FORMS
OF
THE
SIGNALS
THAT
ARE
TRANSPORTED
ACROSS
A
“3-C
LOCK
DTE/DCE” I
NTERFACE
TXC (at DCE)
TXC (at DTE)
TXD (at DTE)
TXD (at DCE)
0.5*tb
SCTE (at DTE)
SCTE (at DCE)
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