SPRUJ17I March 2022 – August 2025 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
The clock runs at 104 MHz: (f = 104 MHz; T = 9.615 ns).
Table 13-194 shows how to calculate timings for the GPMC using the memory parameters.
Table 13-193 shows the timing parameters (on the memory side) that determine the parameters on the GPMC side.
Figure 13-161 shows the asynchronous single write access.
| AC Characteristics on the Memory Side | Description | Duration (ns) |
|---|---|---|
| tWC | Write cycle time | 60 |
| tAVDP | nADV low time | 6 |
| tWP | Write pulse width | 25 |
| tWPH | Write pulse width high | 20 |
| tCS | nCS setup time to nWE | 3 |
| tCAS | nCS setup time to nADV | 0 |
| tAVSC | nADV setup time | 3 |
For asynchronous single write access, write cycle time is WrCycleTime = WeOffTime + AccessCompletion = WeOffTime + 1. For the AccesCompletion, the GPMC requires one cycle of data hold time (nCS deassertion). For more information, see the device-specific Datasheet.
| Parameter Name on GPMC Side | Formula | Duration (ns) | Number of Clock Cycles (F = 104 MHz) | GPMC Registers Configuration |
|---|---|---|---|---|
| ClkActivationTime | N/A (asynchronous mode) | |||
| WdAccessTime | Applicable only to WAITMONITORING (the value is the same as for read access) | |||
| PageBurstAccessTime | N/A (single access) | |||
| WrCycleTime | WeOffTime + AccessCompletion | 57.615 | 6 | WRCYCLETIME = 0x6 |
| CsOnTime | tCAS | 0 | 0 | CSONTIME = 0x0 |
| CsWrOffTime | WeOffTime + 1 | 57.615 | 6 | CSWROFFTIME = 0x6 |
| AdvOnTime | tAVSC | 3 | 1 | ADVONTIME = 0x1 |
| AdvWrOffTime | tAVSC + tAVDP | 9 | 1 | ADVWROFFTIME = 0x1 |
| WeOnTime | tCS | 3 | 1 | WEONTIME = 0x1 |
| WeOffTime | tCS + tWP + tWPH | 48 | 5 | WEOFFTIME = 0x5 |
Figure 13-161 Asynchronous Single Write Access (Timing Parameters in Clock Cycles)