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TMS320C6474
SPRS552F – OCTOBER 2008 – REVISED JULY 2010
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7.8.3
PLL1 Controller Register Descriptions
This section provides a description of the PLL1 controller registers. For details on the operation of the PLL
controller module, see the TMS320C6474 DSP Software-Programmable Phase-Locked Loop (PLL)
Controller User's Guide (literature number
SPRUG09
).
NOTE: The PLL1 controller registers can only be accessed using the CPU or the emulator.
Not all of the registers documented in the TMS320C6474 DSP Software-Programmable Phase-Locked
Loop (PLL) Controller User's Guide (literature number
SPRUG09
) are supported on the C6474 device.
Only those registers documented in this section are supported. Furthermore, only the bits within the
registers described here are supported. You should not write to any reserved memory location or change
the value of reserved bits.
7.8.3.1
PLL1 Control Register
The PLL control register (PLLCTL) is shown in
Figure 7-11
and described in
Table 7-25
.
31
16
Reserved
R-0
15
8
7
6
5
4
3
2
1
0
PLL
Reserved
Rsvd
Rsvd
Reserved
PLLRST
Rsvd
PLLEN
PWRDN
R-0
R/W-0
R-1
R/W-0
R/W-1
R-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 7-11. PLL1 Control Register (PLLCTL) [Hex Address: 029A 0100]
Table 7-25. PLL1 Control Register (PLLCTL) Field Descriptions
Bit
Field
Value
Description
31:8
Reserved
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
7
Reserved
Reserved. Writes to this register must keep this bit as 0.
6
Reserved
Reserved. The reserved bit location is always read as 1. A value written to this field has no effect.
5:4
Reserved
Reserved. Writes to this register must keep this bit as 0.
3
PLLRST
PLL reset bit
0
PLL reset is released
1
PLL reset is asserted
2
Reserved
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
1
PLLPWRDN
PLL power-down mode select bit
0
PLL is operational
1
PLL is placed in power-down state, i.e., all analog circuitry in the PLL is turned-off
0
PLLEN
PLL enable bit
0
Bypass mode. PLL is bypassed. All the system clocks (SYSCLKn) are divided down directly from
input reference clock.
1
PLL mode. PLL is not bypassed. PLL output path is enabled. All the system clocks (SYSCLKn) are
divided down from PLL output.
120
Peripheral Information and Electrical Specifications
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