14
CX-3311
1
2
3
4
A
B
C
D
E
F
1
2
3
4
1.10 SDRAM I/F
SDRAM Interface
*
Looking from DVD-LSI
Signal Name
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
NCAS
NEW
NCS
DQM[0]
DQM[1]
MCK
MCKI
Bits
16
12
2
1
1
1
1
1
1
1
1
I/O
I/O
O
O
O
O
O
O
O
O
O
I
Description
Data bus for external SDRAM
SDRAM address
SDRAM bank address
RAS signal of SDRAM
CAS signal of SDRAM
Write enable signal of SDRAM
Chip select signal of SDRAM
Data mask 0 of SDRAM
Data mask 1 of SDRAM
Clock input to SDRAM
Clock input for data input from SDRAM
[Outline]
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 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)
Connection Structure of SDRAM
DVD-LSI
SDRAM
IC1501
IC1480
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
NCAS
NEW
DQM[1:0]
NCSM
MCK
MCKI
DQ[15:0]
A[11:0]
BA[1:0]
XRAS
XCAS
XWE
DQM[1:0]
XCS
CLK
