Multicore Fixed and Floating-Point System-on-Chip
Copyright 2012 Texas Instruments Incorporated
TMS320C6670 Peripheral Information and Electrical Specifications
145
SPRS689D—March 2012
TMS320C6670
PASS PLL power is supplied via the PASS PLL power-supply pin (AVDDA3). An external EMI filter circuit must be
added to all PLL supplies. Please see the
Hardware Design Guide for KeyStone Devices
in
Documentation from Texas Instruments’’ on page 66
for detailed recommendations. For the best performance, TI
recommends that all the PLL external components be on a single side of the board without jumpers, switches, or
components other than those shown. For reduced PLL jitter, maximize the spacing between switching signal traces
and the PLL external components (C1, C2, and the EMI Filter).
Figure 7-25
PASS PLL Block Diagram
7.7.1 PASS PLL Control Registers
The PASS PLL, which is used to drive the Network Coprocessor, does not use a PLL controller. PASS PLL can be
controlled using the PAPLLCTL0 and PAPLLCTL1 registers located in Bootcfg module. These MMRs
(memory-mapped registers) exist inside the Bootcfg space. To write to these registers, software should go through
an un-locking sequence using KICK0/KICK1 registers. For suggested configurable values see 2.4.3
3.3.4 ‘‘Kicker Mechanism (KICK0 and KICK1) Register’’
for the address location of the
registers and locking and unlocking sequences for accessing these registers. These registers are reset on POR only.
.
Figure 7-26
PASS PLL Control Register (PASSPLLCTL0)
(1)
1 This register is Reset on POR only.
31
24
23
22
19
18
6
5
0
BWADJ[7:0]
BYPASS
Reserved
PLLM
PLLD
RW,+0000 1001
RW,+0
RW,+0001
RW,+0000000010011
RW,+000000
Legend: RW = Read/Write; -
n
= value after reset
S
Y
SCLK
(
P|N
)
ALTCORECLK
(
P|N
)
CORECLKSEL
PASSCLK
(
P|N
)
PACLKSEL
C66x
CorePac
Network
Coprocessor
S
Y
SCLK
n
/3
PLLOUT
PLL
Controller
PLL
1
0
/2
xPLLM
PLLD
PASS PLL
B
Y
PASS
/
PLLOUT
S
Y
SCLK1
PASSPLLCTL1[13]
Содержание TMS320C6670
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