- Texas Instruments Floating Point Digital Signal Processor Specification Sheet

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SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005
49
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
PLL and PLL controller (continued)
PLLCSR Register (0x01B7 C100)
31
28 27
24 23 20 19
16
Reserved
R−0
15 12 11
87 6543 21 0
Reserved
STABLE Reserved PLLRST Reserved PLLPWRDN PLLEN
R−0 R−x R−0 RW−1 R/W−0 R/W−0b RW−0
Legend: R = Read only, R/W = Read/Write; -n = value after reset
Table 29. PLL Control/Status Register (PLLCSR)
BIT # NAME DESCRIPTION
31:7 Reserved Reserved. Read-only, writes have no effect.
6 STABLE
Oscillator Input Stable. This bit indicates if the OSCIN/CLKIN input has stabilized.
0 – OSCIN/CLKIN input not yet stable. Oscillator counter is not finished counting (default).
1 – OSCIN/CLKIN input stable.
5:4 Reserved Reserved. Read-only, writes have no effect.
3 PLLRST
Asserts RESET to PLL
0 – PLL Reset Released.
1 – PLL Reset Asserted (default).
2 Reserved Reserved. The user must write a “0” to this bit.
1 PLLPWRDN
Select PLL Power Down
0 – PLL Operational (default).
1 – PLL Placed in Power-Down State.
0 PLLEN
PLL Mode Enable
0 – Bypass Mode (default). PLL disabled.
Divider D0 and PLL are bypassed. SYSCLK1/SYSCLK2/SYSCLK3 are divided down
directly from input reference clock.
1 – PLL Enabled.
Divider D0 and PLL are not bypassed. SYSCLK1/SYSCLK2/SYSCLK3 are divided down
from PLL output.