RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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Table 2-3. MDP Hardware Interface Signal Definitions (Cont'd)
Label
I/O Type
Signal Name/Description
EYE DIAGNOSTIC INTERFACE
Three signals provide the timing and data necessary to create an oscilloscope quadrature eye pattern. The eye
pattern is simply a display of the received baseband constellation. By observing this constellation, common line
disturbances can usually be identified.
EYEXY
OA
Serial Eye Pattern X/Y Output. Serial Eye Pattern X/Y Output. EYEXY is a serial output containing two 16-bit
diagnostic words (EYEX and EYEY) for display on an oscilloscope.
EYEX data is the first 16 bits, MSB first, that are shifted out on the high portion of the EYESYNC clock. EYEX is
a serial bit stream that is the equivalent of modem interface memory register XDAM1 followed by XDAL1.
EYEY data is the second 16 bits, MSB first, that are shifted out on the low portion of the EYESYNC clock.
EYEY is a serial bit stream that is the equivalent of modem interface memory register YDAM1 followed by
YDAL1.
EYECLK
OA
Serial Eye Pattern Clock. EYECLK is a 345.6 KHz clock. Since the EYEXY data is shifted out on the rising
edge of EYECLK, any eye pattern generator circuitry should sample EYEXY on the falling edge of EYECLK.
EYESYNC
OA
Serial Eye Pattern Strobe. EYESYNC is a strobe that indicates whether the EYEX or EYEY portion of EYEXY
is being shifted. The EYESYNC frequency is equal to the sample rate of the modem configuration.
REFERENCE SIGNALS AND MODEM INTERCONNECT
VC
MI
Low Voltage Reference. Connect to analog ground through 10 µF (polarized, + terminal to VC) and 0.1 µF
(ceramic) in parallel.
VREF
MI
High Voltage Reference. Connect to VC through 10 µF (polarized, + terminal to VREF) and 0.1 µF (ceramic) in
parallel.
SR1IO
MI
SR1IO. Connect to MDP: TMODE (23) & RMODE (18).
TMODE
MI
Transmitter Mode. Connect to MDP: RMODE (18).
RMODE
MI
Receiver Mode. Connect to MDP: TMODE (23) & SR1IO (88), and to XIA: RMODE (7).
SR3IN
MI
SR3IN. Connect to MDP: RXOUT (17).
RXOUT
MI
Receive Data Out. Connect to MDP: SR3IN (79).
SR4OUT
MI
SR4OUT. Connect to MDP: TXDAT (24).
TXDAT
MI
Transmit Data In. Connect to MDP: SR4OUT (90).
IACLK
MI
IACLK. Connect to MDP: CLKIN (48) and to XIA: CLKIN (4).
CLKIN
MI
CLKIN. Connect to MDP: IACLK (50).
IA1CLK
MI
IA1CLK. Connect to MDP: TSTROBE (19).
TSTROBE
MI
Transmitter Strobe. Connect to MDP: IA1CLK (86).
SA1CLK
MI
SA1CLK. Connect to MDP: TRESET (20).
TRESET
MI
Transmitter Reset. Connect to MDP: SA1CLK (87).
SR4IN
MI
SR4IN. Connect to XIA: RXDAT (6).
SR3OUT
MI
SR3OUT. Connect to XIA: TXDAT (13).
Notes:
1. I/O
types:
MI = Modem interconnect.
IA, IB, IC, ID = digital input (seeTable 2-5).
OA, OB, OC, OD = digital output (see Table 2-5).
I(DA) = analog input (see Table 2-6).
O(DD), O(DF) = analog output (seeTable 2-6).
Summary of Contents for RFX144V24-S23
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