SPRUIL1D May 2019 – December 2024 DRA829J , DRA829J-Q1 , DRA829V , DRA829V-Q1 , TDA4VM , TDA4VM-Q1
This section lists all the formulas to calculate asynchronous NOR timing parameters. This is the case when GPMC_CONFIG1_i[11-10] DEVICETYPE = 0x0 and when READTYPE or WRITETYPE are set to asynchronous mode. Table 12-364 describes the asynchronous NOR formulas.
| Configuration Parameter | Unit | Description |
|---|---|---|
| A | ns | Pulse duration – nCS low |
| B | ns | Delay time – nCS valid to nADV/ALE invalid |
| C | ns | Delay time – nCS valid to nOE/nRE invalid (single read) |
| D | ns | Pulse duration – address bus valid - 2nd, 3rd and 4th accesses |
| E | ns | Delay time – nCS valid to nWE valid |
| F | ns | Delay time – nCS valid to nWE invalid |
| G | ns | Address invalid duration between two successive R/W accesses |
| H | ns | Setup time – read data valid before nOE/nRE high |
| I | ns | Delay time – nCS valid to nOE/nRE invalid (burst read) |
| J | ns | Delay time – address bus valid to nCS valid |
| Delay time – data bus valid to nCS valid | ||
| Delay time – nBE0 / nBE1 valid to nCS valid | ||
| K | ns | Delay time – nCS valid to nADV/ALE valid |
| L | ns | Delay time – nCS valid to nOE/nRE valid |
| M | ns | Delay time – nCS valid to first data latching edge |
| N | ns | Pulse duration – nBE0 / nBE1 valid time |
| O | ns | Delay time – nCS valid to nADV/ALE valid |
The configuration parameters are calculated through the following formulas. These formulas are not exhaustive. For more information, see the device-specific Datasheet.
Figure 12-282 shows a simplified example of an asynchronous NOR single write where formulas are associated with signal waves.
Figure 12-282 Asynchronous NOR Single Write Simplified ExampleWrite multiple access is not supported in asynchronous mode. If WRITEMULTIPLE is enabled with WRITETYPE as asynchronous, the GPMC processes single asynchronous accesses.