User Guide

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SRIO Registers
Table 40. SERDES Receive Channel Configuration Registers n (SERDES_CFGRX n_CNTL) Field
Descriptions (continued)
Bit Field Value Description
11 Reserved Reserved.
10:8 TERM Termination. Selects input termination options suitable for a variety of AC or DC coupled
scenarios.
000 Common point connected to VDDT. This configuration is for DC coupled systems using CML
transmitters. The common mode voltage is determined jointly by both the receiver and the
transmitter. Common mode termination is via a 50pF capacitor to VSSA.
001 Common point set to 0.8 VDDT. This configuration is for AC coupled systems using CML
transmitters. The transmitter has no effect on the receiver common mode, which is set to optimize
the input sensitivity of the receiver. Common mode termination is via a 50pF capacitor to VSSA.
010 Reserved
011 Common point floating. This configuration is for DC coupled systems that require the common
mode voltage to be determined by the transmitter only. These are typically not CML. Common
mode termination is via a 50pF capacitor to VSSA.
1xx Reserved
7 INVPAIR Invert polarity. Inverts polarity of RXP I and RXN n.
0 Normal polarity. RXP n considered to be positive data and RXN i negative.
1 Inverted polarity. RXP n considered to be negative data and RXN n positive.
6:5 RATE Operating rate. Selects full, half or quarter rate operation.
00 Full rate. Two data samples taken per PLL output clock cycle.
01 Half rate. One data sample taken per PLL output clock cycle.
10 Quarter rate. One data sample taken every two PLL output clock cycles.
11 Reserved
4:2 BUS- Bus width. Selects the width of the parallel interface (10 or 8 bit).
WIDTH
000 10-bit operation. Data is output on RD n[9:0]. RXBCLK[ n] period is 10 bit periods (4 high, 6 low).
001 8-bit operation. Data is output on RD n[7:0]. RXBCLK[ n] period is 8 bit periods (4 high, 4 low).
RD n[9:8] will replicate bits [1:0] from the previous byte.
01x Reserved
1xx Reserved
1 Reserved Reserved, keep as zero during writes to this register.
0 ENRX Enable receiver. Enables this receiver when high.
0 Disable
1 Enable
Table 41. EQ Bits
CFGRX[22:19] Low Freq Gain Zero Freq (at e
28
(min))
0000 Maximum -
0001 Adaptive Adaptive
001x Reserved
01xx Reserved
1000 Adaptive 1084MHz
1001 805MHz
1010 573MHz
1011 402MHz
1100 304MHz
1101 216MHz
1110 156MHz
1111 135MHz
SPRU976 March 2006 Serial RapidIO (SRIO) 113
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