Datasheet

Flags and Memory Selects

2-6 ADSP-21489 EZ-Board Evaluation System Manual

Flags and Memory Selects

The processor has four asynchronous memory selects, four flag pins, three

interrupt request pins, and one timer expired pin. All flag/memory pins

are multi-functional and depend on the ADSP-21489 processor setup.

Table 2-3 shows the pin names, corresponding peripheral and net names,

switch designators through which the pins are connected to the peripher-

als, and default switch settings.

To use the flags or memory selects on the expansion II interface, disable

any signal driving a flag or memory pin with the associated switch. The

pinout of the expansion connectors can be found in “ADSP-21489

EZ-Board Schematic” on page B-1.

Table 2-3. Flags and Memory Select Connections

Flag/Memory Pin Peripheral Peripheral Net Connected via

Switch

Setting

(Default)

MS0 SDRAM SDRAM_CS SW13.1 ON

MS1 Parallel flash memory FLASH_CS SW13.2 ON

FLAG0/IRQ0 Temp sensor TEMP_IRQ SW13.3 OFF

FLAG1/IRQ1 Push buttons PB1 SW13.4 ON

FLAG2/IRQ2/MS2 Push buttons PB2 SW13.5 ON

FLAG3

/TIMEXP/MS3 Temp Sensor TEMP_THERM SW13.6 OFF

FLAG3/TIMEXP/MS3 SRAM SRAM_CS SW13.7 ON

WDTRSTO_Z Reset Supervisory IC WDTRSTO SW13.8 OFF