參數(shù)資料
型號(hào)： STSAM9708
廠商： Atmel Corp.
英文描述： Sound Synthesis
中文描述： 聲音合成
文件頁(yè)數(shù)： 5/30頁(yè)
文件大?。?/td> 373K
代理商： STSAM9708
5
ATSAM9708
1772D–DRMSD–01/04
Note:
1. Memory group pins are powered by V
CC2
power rail.
Note:
1. X2 cannot be used to drive external circuitry.
RAS
1
I/O
DRAM/SDRAM row address strobe. At the end of reset RAS is tested to
determine memory type configuration (pulled high to select SDRAM type). RAS
should be pulled to V
CC
or GND through an external 10K resistor.
CAS
1
I/O
DRAM/SDRAM column address strobe. At the end of reset CAS is tested to
determine memory type configuration (pulled high to select DRAM type). CAS
should be pulled to V
CC
or GND through an external 10K resistor.
REFRESH
1
I/O
Indicates that a DRAM/SDRAM memory refresh cycle is in progress. To be
used with multiple SIMM/DIMM modules to force refresh simultaneously on all
modules. At the end of reset REFRESH is tested to select bootstrap state
(pulled high to start built-in CPU bootstrap in case of ROMless applications).
Table 5.
Miscellaneous Group
Name
Pin Count
Type
Function
LFT
1
ANA
PLL low pass filter. Should be connected to an external RC network.
TEST
1
IN
Test pin. Should be returned to GND.
LDTEST
1
IN
Test pin. Should be returned to GND.
PDWN
1
IN
Power down, active low
RESET
1
IN
Master reset input, active low. Schmidt trigger input.
X1, X2
(1)
2
–
Crystal connection. Crystal frequency should be f
S
x 256 (typ 11.2896 MHz).
Crystal frequency is internally multiplied by 4 to provide the IC master clock. X1
can also be used as external clock input (3.3V input).
Table 4.
Memory Group
(1)
(Continued)
Name
Pin Count
Type
Function
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