NSK70721PE.C2 Intel, NSK70721PE.C2 Datasheet - Page 27

• Manufacturer Part Number: NSK70721PE.C2
• Manufacturer: Intel

Specifications of NSK70721PE.C2

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Supplier Unconfirmed

3.1.6.2
Datasheet
Table 8. Main Control Register (WR0)
WR2—Interrupt Mask and TIP/RING Reversal Register
Table 9
Bit
B7
B6
B5
B4
B3
B2
B1
B0
shows the interrupt masks and TIP/RING reversal control provided in register WR2.
Address: A<3:0> = 0010
Default: 00h
Attributes: Write Only.
Transmit Test Pulse Enable (TXTST). Set TXTST to 1 to transmit isolated pulses. TDATA controls
the sign and TFP controls the magnitude of the transmitted pulses according to the 2B1Q encoding
rules described in
mode 6 the pulses are transmitted every 7008 BIT_CLK cycles, corresponding to the ETSI framing
sequence. In framed mode 7 the pulses are transmitted every 4704 BIT_CLK cycles. TXTST is
available only in the Inactive state of the Data Pump.
Back-End Loop Back (BELB). In Active state, set BELB to 1 to enable an internal back-end
loopback. RDATA and RFP outputs are used in place of the TDATA and TFP inputs, respectively.
TDATA and TFP signals from the external interface are ignored.
Front End Loop Back (FELB). In the Master mode, with the Data Pump in Inactive state, set FELB
to 1 to enable an IAFE front-end loopback. Upon setting ACTREQ bit to high, the Data Pump will
begin activation using its own signals received at the BTIP and BRING inputs. Proper operation in
this mode is dependent on the configuration of external line interface circuit components.
Repeater Mode (RPTR). In Master mode, set RPTR bit to 1 to program the Data Pump to operate in
repeater mode. This ensures that the phase of BIT_CLK is aligned with the TFP pulse. Note that to
configure two Data Pumps to operate as a repeater, MASTER_CLK output from Slave Data Pump is
connected to MASTER_CLK input of adjacent Master Data Pump. RFP of the Slave Data Pump is
connected to TFP input of Master Data Pump. In Slave mode, RPTR bit has no function and can be
set to either 0 or 1. This feature is available only in operating mode 6 and 7.
Loop Number (LOOPID). LOOPID is set at the Master end of the loop and selects the frame sync
word format to encode the loop number. Set LOOPID=0 for loop number 1 to transmit sync word
quats as +3,+3, +3,-3,-3,+3,-3 in accordance with ANSI and ETSI standards. Set LOOPID=1 for loop
number 2 to transmit time reversed sync word quats as -3,+3,-3,-3,+3,+3,+3 in accordance with
ANSI standard. LOOPID must be set before the Master is activated. This control bit is functional
only at the Master Data Pump. The Slave sets its transmitted LOOPID equal to the received
LOOPID. In Slave mode this bit has no function and may be set to 0 or 1. LOOPID is provided only
when operating in framed modes 6 or 7.
Insertion Loss Measurement Test (ILMT). Set ILMT to 1 to transmit a scrambled all ones test
pattern. In operating mode 6 and 7 the signals transmitted are framed with valid sync word, whereas
in the rest of the operating modes signals transmitted are unframed without any sync word. If the
loop is connected to a Slave Data Pump then it may begin activating.
Quiet Mode (QUIET). Set QUIET to 1 to force the Data Pump into the Deactivated state thus
disabling the transmitter. When this bit goes from high to low, the Master Data Pump will remain in
the Inactive state. Neither Data Pump can begin the activation process when QUIET is asserted.
Activation Request (ACTREQ). In the Master mode when the Data Pump is in the Inactive state
and Quiet is set to 0, set ACTREQ to 1 to initiate an activation sequence. If an activation attempt
fails, another activation attempt will begin immediately after the expiration of the Master Activation
Timer unless ACTREQ has been set to 0. In Slave mode, this bit has no function and should be set
to 0.
Enhanced Multi-Rate DSL Data Pump Chip Set — SK70725/SK70721
Table
3. The TXTST function is available only in framed modes 6 and 7. In framed
Description
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