Texas Instruments SPRU938B - Manual (Page 26)

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3.2 Control Register (CTRL)
VLYNQ Port Registers
The control register (CTRL) determines operation of the VLYNQ module. The CTRL is shown in Figure 10
and described in Table 7 .
Figure 10. Control Register (CTRL)
31 30 29 27 26 24 23 22 21 20 19 18 16
PMEN SCLKPUDIS Reserved RXSAMPELVAL RTMVALIDWR RTMENABLE TXFASTPATH Reserved CLKDIV
R/W- 0 R/W- 0 R-0 R/W- 3h R/W- 0 R/W- 0 R/W- 0 R-0 R/W- 0
15 14 13 12 8 7 6 3 2 1 0
CLKDIR INTLOCAL INTENABLE INTVEC INT2CFG Reserved AOPTDISABLE ILOOP RESET
R/W- 0 R/W- 0 R/W- 0 R/W-0 R/W-0 R-0 R/W- 0 R/W- 0 R/W- 0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7. Control Register (CTRL) Field Descriptions
Bit Field Value Description
31 PMEN Power management enable.
0 VLYNQ CLK is always active if it is set as an output (assuming that VLYNQ module is enabled).
If set as an output, VLYNQ CLK becomes inactive when there is no traffic over the serial bus.
1 The PMEN bit should only be set to 1 when the SCRUN is connected to the remote/external
VLYNQ device.
30 SCLKPUDIS 0 Serial clock pull-up disable. Always write 0.
29-27 Reserved 0 Reserved. Always read as 0. Writes have no effect.
26-24 RXSAMPELVAL 0-7h RTM sample value. If the RTMENABLE bit is 0, the receive timing manager forces the value in the
RXSAMPELVAL bit as the clock sample value. If the RTMENABLE bit is 1, then the value set by
the RXSAMPELVAL bit is ignored. In order to modify the value, you must simultaneously write a 1
to the RTMVALIDWR bit.
23 RTMVALIDWR RTM valid write bit.
0 Will not allow writes to RXSAMPLEVAL bits.
1 Will allow writes to RXSAMPLEVAL bits.
22 RTMENABLE RTM enable bit.
The receive timing manager uses the value set in the RXSAMPLEVAL bit as the clock sample
0
value.
1 The receive timing manager is enabled. It automatically selects the receive clock.
21 TXFASTPATH 0-1 Transmit fast path. When set, the fastest path is chosen for the serial data.
20-19 Reserved 0 Reserved. Always read as 0. Writes have no effect.
18-16 CLKDIV 0-7h Serial clock output divider.
15 CLKDIR Serial CLK direction. Determines whether the VLYNQ CLK is an input or an output.
0 The VLYNQ CLK is externally sourced.
The VLYNQ CLK is internally sourced and equal to the VLYNQ module system clock divided by the
1
divider value set in the CLKDIV bit.
14 INTLOCAL Interrupt local.
0 The interrupt is forwarded to the remote VLYNQ device over the serial interface as an interrupt
packet.
Interrupt is posted in the interrupt status/clear register and results in the assertion of the VLQINT to
1
the device interrupt controllers.
13 INTENABLE Interrupt enable.
0 VLYNQ module status interrupts are ignored.
VLYNQ module status interrupts (if RERROR or LERROR bits are set) are posted to the interrupt
1
pending/set register.
12-8 INTVEC 0-1Fh Interrupt vector. This bit indicates which bit in the interrupt pending/set register is set for VLYNQ
module status (RERROR/LERROR) interrupts.
26 VLYNQ Port SPRU938B – September 2007
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