Serial RapidIO (SRIO) User's Guide
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2.3.2.3 Enabling the Transmitter
SRIO Functional Description
Table 9. SERDES Receive Channel Configuration Register n (SERDES_CFGRX n_CNTL) Field
Descriptions (continued)
Bit Field Value Description
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 10. EQ Bits
CFGRX[22–19] Low Freq Gain Zero Freq (at e
28
(min))
0000b Maximum –
0001b Adaptive Adaptive
001xb Reserved
01xxb Reserved
1000b Adaptive 1084MHz
1001b 805MHz
1010b 573MHz
1011b 402MHz
1100b 304MHz
1101b 216MHz
1110b 156MHz
1111b 135MHz
To enable a transmitter for serialization, the ENTX bit of the associated SERDES_CFGTX n_CNTL
registers (110h–10Ch) must be set high. When ENTX is low, all digital circuitry within the transmitter will
be disabled, and clocks will be gated off, with the exception of the transmit clock (TXBCLK[ n]) output,
which will continue to operate normally. All current sources within the transmitter will be fully powered
down, with the exception of the current mode logic (CML) driver, which will remain powered up if boundary
scan is selected. Figure 11 shows the fields of SERDES_CFGTX n_CNTL and Table 11 describes them.
Figure 11. SERDES Transmit Channel Configuration Register n (SERDES_CFGTX n_CNTL)
31 17 16
Reserved ENFTP
R-0 R/W-1
15 12 11 9 8 7 6 5 4 2 1 0
DE SWING CM INVPAIR RATE BUSWIDTH (write 0) ENTX
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/W = Read/Write; R = Read only; - n = Value after reset
Table 11. SERDES Transmit Channel Configuration Register n (SERDES_CFGTX n_CNTL) Field
Descriptions
Bit Field Value Description
31–17 Reserved 0 These read-only bits return 0s when read.
16 ENFTP 1 Enables fixed phase relationship of transmit input clock with respect to transmit output
clock. The only valid value for this field is 1b; all other values are reserved.
SPRUE13A – September 2006 Serial RapidIO (SRIO) 33
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