ds2154lnd2 Maxim Integrated Products, Inc., ds2154lnd2 Datasheet - Page 11

• Manufacturer Part Number: ds2154lnd2
• Description: Ds2154 Enhanced E1 Single Chip Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

2.1 Transmit Side Digital Pins
PIN
46
47
53
33
51
34
35
37
52
48
49
50
43
42
41
TSYSCLK
TCHCLK
TCHBLK
TSSYNC
TDATA
TNEGO
TCLKO
TLCLK
TSYNC
TPOSO
TLINK
NAME
TESO
TCLK
TSER
TSIG
Transmit Channel Clock. A 256kHz clock that pulses high during the LSB of each
channel. Synchronous with TCLK when the transmit side elastic store is disabled.
Synchronous with TSYSCLK when the transmit side elastic store is enabled. Useful for
parallel to serial conversion of channel data.
Transmit Channel Block. A user-programmable output that can be forced high or low
during any of the 32 E1 channels. Synchronous with TCLK when the transmit side
elastic store is disabled. Synchronous with TSYSCLK when the transmit side elastic
store is enabled. Useful for blocking clocks to a serial UART or LAPD controller in
applications where not all E1 channels are used such as Fractional E1, 384kbps (H0),
768kbps, 1920kbps (H12), or ISDN-PRI. Also useful for locating individual channels in
drop-and-insert applications, for external per-channel loopback, and for per-channel
conditioning. See Section
Transmit System Clock. 1.544MHz or 2.048MHz clock. Only used when the transmit
side elastic store function is enabled. Should be tied low in applications that do not use
the transmit side elastic store. Can be burst at rates up to 8.192MHz.
Transmit Link Clock. 4 kHz or 20kHz demand clock (Sa bits) for the TLINK input.
See Section
Transmit Link Data. If enabled, this pin will be sampled on the falling edge of TCLK
for data insertion into any combination of the Sa bit positions (Sa4 to Sa8). See Section
12
Transmit Sync. A pulse at this pin will establish either frame or multiframe boundaries
for the transmit side. This pin can also be programmed to output either a frame or
multiframe pulse. It is always synchronous with TCLK. See Section
Transmit System Sync. Only used when the transmit side elastic store is enabled. A
pulse at this pin will establish either frame or multiframe boundaries for the transmit
side. Should be tied low in applications that do not use the transmit side elastic store.
Always synchronous with TSYSCLK.
Transmit Signaling Input. When enabled, this input will sample signaling bits for
insertion into outgoing PCM E1 data stream. Sampled on the falling edge of TCLK
when the transmit side elastic store is disabled. Sampled on the falling edge of
TSYSCLK when the transmit side elastic store is enabled. See Section
Transmit Elastic Store Data Output. Updated on the rising edge of TCLK with data
out of the transmit side elastic store whether the elastic store is enabled or not. This pin
is normally tied to TDATA.
Transmit Data. Sampled on the falling edge of TCLK with data to be clocked through
the transmit side formatter. This pin is normally tied to TESO.
Transmit Positive Data Output. Updated on the rising edge of TCLKO with the
bipolar data out of the transmit side formatter. Can be programmed to source NRZ data
via the Output Data Format (TCR1.7) control bit. This pin is normally tied to TPOSI.
Transmit Negative Data Output. Updated on the rising edge of TCLKO with the
bipolar data out of the transmit side formatter. This pin is normally tied to TNEGI.
Transmit Clock Output. Buffered clock that is used to clock data through the transmit
side formatter (i.e., either TCLK or RCLKO if Loss of Transmit Clock is enabled and in
effect, or RCLKI if remote loopback is enabled). This pin is normally tied to TCLKI.
Transmit Clock. A 2.048MHz primary clock. Used to clock data through the transmit
side formatter. Must be present for the parallel control port to operate properly. If not
present, the Loss of Transmit Clock (LOTC) function can provide a clock.
Transmit Serial Data. Transmit NRZ serial data. Sampled on the falling edge of
TCLK when the transmit side elastic store is disabled. Sampled on the falling edge of
TSYSCLK when the transmit side elastic store is enabled.
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12
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FUNCTION
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14
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