SPRUJ17I March 2022 – August 2025 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
Synchronous burst write mode provides synchronous single or consecutive accesses.
Figure 13-138 shows a synchronous burst write access when the chip-select is configured in address/data-multiplexed mode.
Figure 13-138 Synchronous Multiple Write (Burst Write) in Address/Data-Multiplexed ModeFigure 13-139 shows the same synchronous burst write access when the chip-select is configured in address/address/data-multiplexed (AAD-multiplexed) mode.
Figure 13-139 Synchronous Multiple Write (Burst Write) in Address/Address/Data-Multiplexed ModeThe first data of the burst is driven on the A/D bus at the GPMC_CONFIG6_i[19-16] WRDATAONADMUXBUS bit field.
When WRACCESSTIME completes, control-signal timings are frozen during the multiple data transactions, corresponding to the GPMC_CONFIG5_i[27-24] PAGEBURSTACCESSTIME bit field multiplied by the number of remaining data transactions.
When the GPMC generates a read access to an address/data-multiplexed device, it drives the address bus until nOE assertion time. For more information, see Section 13.3.1.4.7.2.3, Address/Data-Multiplexing Interface.
The nWE falling edge must not be used to control the time when the burst first data is driven in the address/data bus, because some new devices require the nWE signal to be low during the address phase.
When the GPMC generates a write access to an AAD-multiplexed device, all address bits are driven onto the address/data bus in two separate phases. The first phase is used for the MSB address and is qualified with nOE driven low. The second phase for LSB address is qualified with nOE driven high. The address phase ends at nWE assertion time.
The nCS, and DIR signals are controlled as previously described.
First write data is driven by the GPMC at GPMC_CONFIG6_i[19-16] WRDATAONADMUXBUS, when in address/data-multiplexed configuration. The next write data of the burst is driven on the bus at WRACCESSTIME + 1 during GPMC_CONFIG5_i[27-24] PAGEBURSTACCESSTIME GPMC_FCLK cycles. The last data of the synchronous burst write is driven until GPMC_CONFIG5_i[12-8] WRCYCLETIME completes.
After a write operation, if no other access (read or write) is pending, the data bus keeps the previous value. See Section 13.3.1.4.8.10, Bus Keeping Support.