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5.14 SERDES Transmit Channel Configuration Registers n (SERDES_CFGTX n_CNTL)
SRIO Registers
There are four of these registers, to support four ports.
Figure 70. SERDES Transmit Channel Configuration Registers n (SERDES_CFGTX n_CNTL)
31 17 16
Reserved ENFT
P
R-0 R/W-0
15 12 11 9 8 7 6 5 4 2 1 0
DE SWING CM INVPA RATE BUSWIDTH Reserv ENTX
IR ed
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R = Read, W = Write, n = value at reset
Table 42. SERDES Transmit Channel Configuration Registers n (SERDES_CFGTX n_CNTL) Field
Descriptions
Bit Field Value Description
31:17 Reserve Reserved.
d
16 ENFTP Enable fixed TXBCKLIN n phase. Enables fixed phase relationship of TXBCLKIN n with respect to
TXBCLK n.
0 Arbitrary phase. No required phase relationship between TXBCLKIN n and TXBCLK n.
1 Fixed phase. Requires direct connection of TXBCLK n to TXBCLKIN n using a minimum length net
without buffers.
15:12 DE De-emphasis. Selects one of 15 output de-emphasis settings from 4.76 to 71.42%. See Table 44 .
11:9 SWING Output swing. Selects one of 8 outputs amplitude settings between 125 and 1250mV
dfpp
. See
Table 43 .
8 CM Common mode. Adjusts the common mode to suit the termination at the attached receiver.
0 Normal common mode. Common mode not adjusted.
1 Raised common mode. Common mode raised by 5% of e
54
.
7 INVPAIR Invert polarity. Inverts polarity of TXP n and TXN n.
0 Normal polarity. TXP n considered to be positive data and TXN n negative.
1 Inverted polarity. TXP n considered to be negative data and TXN 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 input on TD n[9:0]. TXBCLK n period is 10 bit periods (4 high, 6 low).
001 8-bit operation. Data is input on TD n[9:2]. TXBCLK n period is 8 bit periods (4 high, 4 low). TD n[1:0]
are ignored.
01x Reserved
1xx Reserved
1 Reserve Reserved
d
0 ENTX Enable transmitter. Enables this transmitter when high.
Serial RapidIO (SRIO)114 SPRU976 March 2006
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