Serial RapidIO (SRIO) User's Guide

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SRIO Registers
Table 57. SERDES Receive Channel Configuration Register n (SERDES_CFGRX n_CNTL) Field
Descriptions (continued)
Bit Field Value Description
15–14 LOS Loss of signal. Enables loss of signal detection with 2 selectable thresholds.
00b Disabled. Loss of signal detection disabled.
01b High threshold. Loss of signal detection threshold in the range 85 to 195mV
dfpp
.
This setting is suitable for Infiniband.
10b Low threshold. Loss of signal detection threshold in the range 65 to 175mV
dfpp
.
This setting is suitable for PCI-E and S-ATA.
11b Reserved
13–12 ALIGN Symbol alignment. Enables internal or external symbol alignment.
00b Alignment disabled. No symbol alignment will be performed while this setting is
selected, or when switching to this selection from another.
01b Comma alignment enabled. Symbol alignment will be performed whenever a
misaligned comma symbol is received.
10b Alignment jog. The symbol alignment will be adjusted by one bit position when this
mode is selected (that is, the ALIGN value changes from 0xb to 1xb).
11b Reserved
11 Reserved 0 This read-only bit returns 0 when read.
10–8 TERM 001b Input termination. The only valid value for this field is 001b. This value sets the
common point to 0.8 VDDT and supports 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 50 pF capacitor to VSSA.
7 INVPAIR Invert polarity. Inverts polarity of RIORXn and RIORXn.
0 Normal polarity. RIORXn is considered to be positive data and RIORXn negative.
1 Inverted polarity. RIORXn is considered to be negative data and RIORXn positive.
6–5 RATE Operating rate. Selects full, half, or quarter rate operation.
00b Full rate. Two data samples taken per PLL output clock cycle.
01b Half rate. One data sample taken per PLL output clock cycle.
10b Quarter rate. One data sample taken every two PLL output clock cycles.
11b Reserved
4–2 BUSWIDTH 000b Bus width. Always write 000b to this field, to indicate a 10-bit-wide parallel bus to
the clock. All other values are reserved. See Section 2.3.2.1 for an explanation of
the bus.
1 Reserved 0 Always write 0 to this reserved bit.
0 ENRX Enable receiver
0 Disable this receiver.
1 Enable this receiver.
Table 58. EQ Bits
CFGRX[22–19] Low Freq Gain Zero Freq (at e
28
(min))
0000b Maximum –
0001b Adaptive Adaptive
001xb Reserved
01xxb Reserved
126 Serial RapidIO (SRIO) SPRUE13A – September 2006
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