ZHCS894U April 2001 – July 2019 TMS320F2810 , TMS320F2811 , TMS320F2812
PRODUCTION DATA.
请参考 PDF 数据表获取器件具体的封装图。
If the XREADY signal is sampled in the asynchronous mode (USEREADY = 1, READYMODE = 1), then:
1. | Lead: | LR ≥ tc(XTIM) | |
LW ≥ tc(XTIM) | |||
2. | Active: | AR ≥ 2 × tc(XTIM) | |
AW ≥ 2 × tc(XTIM) | |||
NOTE: Restriction does not include external hardware wait states | |||
3. | Lead + Active: | LR + AR ≥ 4 × tc(XTIM) | |
LW + AW ≥ 4 × tc(XTIM) | |||
NOTE: Restriction does not include external hardware wait states |
These requirements result in the following XTIMING register configuration restrictions (no hardware to detect illegal XTIMING configurations):
XRDLEAD | XRDACTIVE | XRDTRAIL | XWRLEAD | XWRACTIVE | XWRTRAIL | X2TIMING |
---|---|---|---|---|---|---|
≥ 1 | ≥ 2 | 0 | ≥ 1 | ≥ 2 | 0 | 0, 1 |
or (no hardware to detect illegal XTIMING configurations):
XRDLEAD | XRDACTIVE | XRDTRAIL | XWRLEAD | XWRACTIVE | XWRTRAIL | X2TIMING |
---|---|---|---|---|---|---|
≥ 2 | ≥ 2 | 0 | ≥ 2 | ≥ 2 | 0 | 0, 1 |
Examples of valid and invalid timing when using asynchronous XREADY (no hardware to detect illegal XTIMING configurations):
XRDLEAD | XRDACTIVE | XRDTRAIL | XWRLEAD | XWRACTIVE | XWRTRAIL | X2TIMING | |
---|---|---|---|---|---|---|---|
Invalid | 0 | 0 | 0 | 0 | 0 | 0 | 0, 1 |
Invalid | 1 | 0 | 0 | 1 | 0 | 0 | 0, 1 |
Invalid | 1 | 1 | 0 | 1 | 1 | 0 | 0 |
Valid | 1 | 2 | 0 | 1 | 2 | 0 | 1 |
Valid | 1 | 2 | 0 | 1 | 2 | 0 | 0, 1 |
Valid | 2 | 2 | 0 | 2 | 2 | 0 | 0, 1 |
Unless otherwise specified, all XINTF timing is applicable for the clock configurations shown in Table 5-27.
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 5-26.