参数资料
型号: TMX320R2812PBKS
厂商: Texas Instruments, Inc.
元件分类: 数字信号处理
英文描述: TMS320R2811, TMS320R2812 Digital Signal Processors
中文描述: TMS320R2811,TMS320R2812数字信号处理器
文件页数: 114/147页
文件大小: 2021K
代理商: TMX320R2812PBKS
Electrical Specifications
114
June 2004
SPRS257
Unless otherwise specified, all XINTF timing is applicable for the clock configurations shown in Table 6
25.
Table 6
25. XINTF Clock Configurations
Mode
SYSCLKOUT
XTIMCLK
XCLKOUT
1
Example:
150 MHz
SYSCLKOUT
150 MHz
SYSCLKOUT
150 MHz
2
Example:
150 MHz
SYSCLKOUT
150 MHz
1/2 SYSCLKOUT
75 MHz
3
Example:
150 MHz
1/2 SYSCLKOUT
75 MHz
1/2 SYSCLKOUT
75 MHz
4
Example:
150 MHz
1/2 SYSCLKOUT
75 MHz
1/4 SYSCLKOUT
37.5 MHz
The relationship between SYSCLKOUT and XTIMCLK is shown in Figure 6
25.
XTIMING0
XTIMING1
XTIMING2
XTIMING6
XTIMING7
XBANK
LEAD/ACTIVE/TRAIL
1
0
XCLKOUT
/2
XTIMCLK
1
0
/2
R28x
CPU
XINTCNF2
(CLKMODE)
XINTCNF2
(XTIMCLK)
Default Value after reset
SYSCLKOUT
XINTCNF2
(CLKOFF)
1
0
0
Figure 6
25. Relationship Between XTIMCLK and SYSCLKOUT
6.22
XINTF Signal Alignment to XCLKOUT
For each XINTF access, the number of lead, active, and trail cycles is based on the internal clock XTIMCLK.
Strobes such as XRD, XWE, and zone chip-select (XZCS) change state in relationship to the rising edge of
XTIMCLK. The external clock, XCLKOUT, can be configured to be either equal to or one-half the frequency
of XTIMCLK.
For the case where XCLKOUT = XTIMCLK, all of the XINTF strobes will change state with respect to the rising
edge of XCLKOUT. For the case where XCLKOUT = one-half XTIMCLK, some strobes will change state either
on the rising edge of XCLKOUT or the falling edge of XCLKOUT. In the XINTF timing tables, the notation
XCOHL is used to indicate that the parameter is with respect to either case; XCLKOUT rising edge (high) or
XCLKOUT falling edge (low). If the parameter is always with respect to the rising edge of XCLKOUT, the
notation XCOH is used.
A
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