参数资料
型号: TMDXEVM5515
厂商: Texas Instruments
文件页数: 81/159页
文件大小: 0K
描述: EVAL MODULE DSP FOR C55XX
标准包装: 1
类型: DSP
适用于相关产品: TMS320C55x 系列
所含物品: 板,线缆,CD,电源
产品目录页面: 718 (CN2011-ZH PDF)
其它名称: 296-25753
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
5.5.3
Clock PLL Electrical Data/Timing (Input and Output Clocks)
Table 5-4. Timing Requirements for CLKIN (1)
(2)
(see Figure 5-9 )
NO.
CV DD = 1.05 V
MIN NOM
MAX
MIN
CV DD = 1.3 V
NOM
MAX
UNIT
88.577,
88.577,
1
t c(CLKIN)
Cycle time, external clock driven on
CLKIN
83.333,
or
83.333,
or
ns
81.380
81.380
2
3
t w(CLKINH) Pulse width, CLKIN high
t w(CLKINL) Pulse width, CLKIN low
0.466 *
t c(CLKIN)
0.466 *
t c(CLKIN)
0.466 *
t c(CLKIN)
0.466 *
t c(CLKIN)
ns
ns
4
t t(CLKIN)
Transition time, CLKIN
4
4
ns
(1)
(2)
The CLKIN frequency and PLL multiply factor should be chosen such that the resulting clock frequency is within the specific range for
CPU operating frequency.
The reference points for the rise and fall transitions are measured at V IL MAX and V IH MIN.
1
4
1
2
CLKIN
3
4
Figure 5-9. CLKIN Timing
Table 5-5. Switching Characteristics Over Recommended Operating Conditions for CLKOUT (1)
(2)
CV DD = 1.05 V
CV DD = 1.3 V
NO.
PARAMETER
V DDA_PLL = 1.3 V
MIN
MAX
V DDA_PLL = 1.3 V
MIN
MAX
UNIT
1
t c(CLKOUT)
Cycle time, CLKOUT
P
16.67 or
13.33
P
10 or 8.3
ns
2
3
4
5
t w(CLKOUTH)
t w(CLKOUTL)
t t(CLKOUTR)
t t(CLKOUTF)
Pulse duration, CLKOUT high
Pulse duration, CLKOUT low
Transition time (rise), CLKOUT
Transition time (fall), CLKOUT
0.466 *
t c(CLKOUT)
0.466 *
t c(CLKOUT)
5
5
0.466 *
t c(CLKOUT)
0.466 *
t c(CLKOUT)
5
5
ns
ns
ns
ns
(1)
(2)
The reference points for the rise and fall transitions are measured at V OL MAX and V OH MIN.
P = 1/SYSCLK clock frequency in nanoseconds (ns). For example, when SYSCLK frequency is 100 MHz, use P = 10 ns.
2
1
5
CLKOUT
3
4
Figure 5-10. CLKOUT Timing
Copyright ? 2010–2013, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
Product Folder Links: TMS320C5515
81
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