JAJSFZ4E March 2009 – August 2018 TMS320C28341 , TMS320C28342 , TMS320C28343 , TMS320C28344 , TMS320C28345 , TMS320C28346
PRODUCTION DATA.
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If the XREADY signal is sampled in the synchronous mode (USEREADY = 1, READYMODE = 0), then:
1 | Lead: | LR ≥ 2 × tc(XTIM) | ||
LW ≥ 3 × tc(XTIM) | ||||
2 | Active: | AR ≥ 6 × tc(XTIM) | ||
AW ≥ 2 × tc(XTIM) | ||||
3 | Trail: | TW ≥ 3 × tc(XTIM) |
NOTE
Restriction does not include external hardware wait states.
These requirements result in the following XTIMING register configuration restrictions (based on 300-MHz system clock speed):
XRDLEAD | XRDACTIVE | XRDTRAIL | XWRLEAD | XWRACTIVE | XWRTRAIL | X2TIMING |
---|---|---|---|---|---|---|
≥ 2 | ≥ 6 | ≥ 0 | ≥ 3(2) | ≥ 2 | ≥ 3(2) | 0(1) |
Examples of valid and invalid timing when using synchronous XREADY:
XRDLEAD | XRDACTIVE | XRDTRAIL | XWRLEAD | XWRACTIVE | XWRTRAIL | X2TIMING | |
---|---|---|---|---|---|---|---|
Invalid(1) | 0 | 0 | 0 | 0 | 0 | 0 | 0, 1 |
Invalid(1) | 1 | 0 | 0 | 1 | 0 | 0 | 0, 1 |
Valid(2) | 2 | 6 | 0 | 3 | 2 | 3 | 0(3) |