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1
1.10 SDRAM I/F
[Outline]
A
This is the memory for implementing the AV decoding function of DVD-LSI (IC1501).
It can be used in various ways from buffering the stream data before decoding and
serving as a work area during decoding, to storing the AV and output data after decoding.
SDRAM Interface
Signal Name
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
B
NCAS
NEW
NCS
DQM[0]
DQM[1]
MCK
MCKI
C
SDRAM Design
Data bus range : 16 bit
Operating frequency : 121.5 MHz
CAS latency = 3
8 word burst forwarding
Manual precharge
CAS before RAS refresh (Auto refresh)
D
Connection Structure of SDRAM
DVD-LSI
IC1501
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
NCAS
NEW
DQM[1:0]
NCSM
E
MCK
MCKI
F
14
1
2
*Looking from DVD-LSI
Bits
I/O
Description
16
I/O
Data bus for external SDRAM
12
O
SDRAM address
2
O
SDRAM bank address
1
O
RAS signal of SDRAM
1
O
CAS signal of SDRAM
1
O
Write enable signal of SDRAM
1
O
Chip select signal of SDRAM
Data mask 0 of SDRAM
1
O
1
O
Data mask 1 of SDRAM
1
O
Clock input to SDRAM
1
I
Clock input for data input from SDRAM
SDRAM
IC1480
DQ[15:0]
A[11:0]
BA[1:0]
XRAS
XCAS
XWE
DQM[1:0]
XCS
CLK
2
3
CX-3311
3
4
4
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