参数资料
型号: TMX320F2812GHHS
厂商: Texas Instruments, Inc.
元件分类: 数字信号处理
英文描述: DIGITAL SIGNAL PROCESSORS
中文描述: 数字信号处理器
文件页数: 91/147页
文件大小: 2021K
代理商: TMX320F2812GHHS
Electrical Specifications
91
June 2004
SPRS257
Table 6
4. XCLKIN Timing Requirements
PLL Bypassed or Enabled
NO.
MIN
MAX
UNIT
C8
t
c(CI)
Cycle time, XCLKIN
6.67
250
ns
C9
t
f(CI)
Fall time XCLKIN
Fall time, XCLKIN
Up to 30 MHz
30 MHz to 150 MHz
Up to 30 MHz
6
2
6
ns
C10
t
r(CI)
Rise time XCLKIN
Rise time, XCLKIN
ns
30 MHz to 150 MHz
2
C11
t
w(CIL)
t
w(CIH)
Pulse duration, X1/XCLKIN low as a percentage of t
c(CI)
Pulse duration, X1/XCLKIN high as a percentage of t
c(CI)
40
60
%
C12
40
60
%
Table 6
5. XCLKIN Timing Requirements
PLL Disabled
NO.
MIN
MAX
UNIT
C8
t
c(CI)
Cycle time, XCLKIN
6.67
250
ns
C9
t
f(CI)
Fall time XCLKIN
Fall time, XCLKIN
Up to 30 MHz
30 MHz to 150 MHz
Up to 30 MHz
6
2
6
ns
C10
t
r(CI)
Rise time XCLKIN
Rise time, XCLKIN
ns
30 MHz to 150 MHz
2
C11
t
w(CIL)
Pulse duration X1/XCLKIN low as a percentage of t
Pulse duration, X1/XCLKIN low as a percentage of t
c(CI)
XCLKIN
120 MHz
120
<
XCLKIN
150 MHz
40
60
%
45
55
C12
t
w(CIH)
Pulse duration X1/XCLKIN high as a percentage of t
C
Pulse duration, X1/XCLKIN high as a percentage of t
c(CI)
XCLKIN
120 MHz
120
<
XCLKIN
150 MHz
40
60
%
45
55
Table 6
6. Possible PLL Configuration Modes
PLL MODE
REMARKS
SYSCLKOUT
PLL Disabled
Invoked by tying XPLLDIS pin low upon reset. PLL block is completely
disabled. Clock input to the CPU (CLKIN) is directly derived from the clock
signal present at the X1/XCLKIN pin.
XCLKIN
PLL Bypassed
Default PLL configuration upon power-up, if PLL is not disabled. The PLL
itself is bypassed. However, the /2 module in the PLL block divides the clock
input at the X1/XCLKIN pin by two before feeding it to the CPU.
XCLKIN/2
PLL Enabled
Achieved by writing a non-zero value “n” into PLLCR register. The /2 module
in the PLL block now divides the output of the PLL by two before feeding it to
the CPU.
(XCLKIN * n) / 2
A
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