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MC68194 Datasheet(PDF) 8 Page - ON Semiconductor

Part # MC68194
Description  Carrier Band Modem(CBM)
Download  24 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC68194 Datasheet(HTML) 8 Page - ON Semiconductor

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MC68194
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8
SECTION 3
TRANSMITTER
3.1 OVERVIEW
The transmitter function includes the serial interface
decoder, transmit modulator, transmit buffer, jabber inhibit,
and clock generator. (Although the clock generator is not
used exclusively by the transmit function, the generator will
be discussed here.) The MC68194 receives request channel
symbols on the TXSYMX pins which are synchronized to
TXCLK. As is described in the Serial Interface discussion,
MAC transmit symbols are input serially (CBM in MAC
mode), decoded, and used to modulate an output signal. The
Serial Interface Decoder is used both for MAC mode to
decode
data
transmit
commands
(symbols)
and
management mode to decode management commands. The
decoded transmit commands or symbols are used by the
Transmit Modulator to generate phase–coherent signaling
as discussed in the CBM General Description. The transmit
buffer receives the modulated signal and drives differential
output signals.
The clock generator provides TXCLK and internal clocks
of 2 times (2X) and 4 times (4X) TXCLK. The 4X clock is
actually the oscillator frequency. These clocks are used to
receive the TX symbols and generate the modulated signal.
3.2 TRANSMIT BUFFER
The modulated transmit data stream drives the TXOUT
and TXOUT* pins of the MC68194. These pins are
complementary outputs with closely matched edge
transitions. This is useful in helping meet the IEEE 802.4
carrierband requirement for a transmit jitter of less than
"1% of the data rate. TXOUT and TXOUT* are generally
used to drive a differential amplifier which is used to achieve
the necessary output level at the cable and meet the rise/fall
time window (or “eye” pattern) of the IEEE 802.4. A third
output called TXDIS is available to gate the amplifier
circuitry on or off.
The TXTOUT and TXTOUT* have ECL levels
referenced to VCC (Figure 3–1). Levels are typically 4.11 V
for a high and 3.25 for a low. Pulldown resistors are required
with the outputs specified to drive a maximum load of 220
Ω to ground reference.
Operation of the transmit outputs is controlled in the
following manner:
1. Management mode — The TX outputs are always
disabled while the CBM is in management mode. When
leaving management mode the TX outputs remain
disabled if a RESET command has been issued and an
ENABLE
TRANSMITTER
and
DISABLE
LOOPBACK commands
have
not
been
issued.
Resetting the CBM enables internal loopback and
disables the transmitter.
2. MAC (data) mode — After leaving management mode,
the CBM can function in internal loopback (for test) with
the transmitter disabled, out of loopback with transmitter
disabled (receive only), or in standard data mode with the
TX outputs controlled by the modulator.
Figure 3–1. Transmitter Outputs
RP
TXOUT
RP
TX AMP
VCC–TXOUT
TXDIS
TXOUT*
3. Jabber inhibit activated — If the jabber inhibit fires, it
forces the CBM into management mode and disables the
TX outputs. This condition can only be cleared by a reset
condition.
The TXDIS output is an open collector switched current
source. TXDIS sinks a nominal 0.5 mA when the
TXOUT/TXOUT* outputs are enabled. TXDIS is off or
high impedance when the transmitter is disabled.
The signaling on the TX outputs and TXDIS is shown in
Figure 3–2. The “off” or silence condition is both TXOUT
outputs high and TXDIS also high. The figure shows an
example of the signal pattern for both leaving and entering
a silence condition.
Figure 3–2. Transmitter Output Signaling
SILENCE
OFF
OFF
TXDIS
TXOUT*
0
TXOUT
1
1
ND1
ND2
1


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