BBK DV718SI - Function Introduction to SDRAM

1-9、16-25、48
AO-A19 20 bit address bus I
11 WE Write enable signal, low level is effective 3.23V I
12 RESET Reset, low level is effective 3.23V I
10、13、14
NC Blank pin
15 RY/BY Ready/system busy 3.23V O
26 CE Chip enable, low level effective 0V I
27、46
VSS Ground
28 OE Output enable signal , low level is effective 0V I
29-3、6、38-44
DQ0-DQ14
15 bit data bus O
37 VCC 5V power supply +5V
45 DQ15/A-1
Take word extend mode as data line, and bit extend
mode as address line
I/O
47 BYTE
Select 8-bit or 16-bit output mode. High level is 16-bit
output and low level is 8-bit output
I
3.5.6 Function introduction to SDRAM
1. DESCRIPTION
64M 16-bit memorizer SDRAM (U208) with the player and the working clock frequency is 166/143MHZ.
The function of 16SDRAM in DVD players is to memorizer the program of AML3298 taken out from FLASH
and information of image and sound taken out from disc to form buffer, add the stability of information output
and add anti-shaking effect of player.
2. PIN DESCRIPTION
Pin
Name
Function Signal flow
Pin
Name Function Signal flow
1 VDD 3.3V power supply 28 VSS Ground
2 DQ0 Data bus I/O 29 MA4 Address bus I
3 VDDQ
3.3V power supply I/O 30 MA5 Address bus I
4 DQ1 Data bus I/O 31 MA6 Address bus I
5 DQ2 Data bus I/O 32 MA7 Address bus I
6 VSSQ
Ground 33 MA8 Address bus I
7 DQ3 Data bus I/O 34 MA9 Address bus I
8 DQ4 Data bus I/O 35 MA11 Address bus I
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