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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 233 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
[6:4]
LATENCY
CAS Latency
This field defines the CAS latency parameter of external SDRAM device.
In this chip
, SDRAM controller doesn’t support the mode CAS latency is 2.5. Setting CAS latency
to be 2.5 is inhibited.
For DDR2 SDRAM, SDRAM controller only support CAS latency is 3 or 4. Setting CAS latency to
be 5 or 6 is inhibited.
LATENCY
SDR
DDR
DDR400
DDR2
0
0
0
Reserved
Reserved
Reserved
Reserved
0
0
1
Reserved
Reserved
Reserved
Reserved
0
1
0
2
2
2
Reserved
0
1
1
3
3
Reserved
3
1
0
0
4
Reserved
Reserved
4
1
0
1
Reserved
Reserved
Reserved
5 (Inhibit)
1
1
0
Reserved
2.5 (Inhibit)
2.5 (Inhibit)
6 (Inhibit)
1
1
1
Reserved
Reserved
Reserved
Reserved
The CAS latency setting listed above is for reference. Before configuring SDRAM CAS latency,
it5 or 6 is inhibited.irm the CAS latency value supported by SDRAM device.
[3]
BrstType
Burst Type
This bit indicates the burst type of SDRAM device is sequential or interleaved.
In this chip, the SDRAM controller only support sequential burst type and this bit will be fixed at 1
6 is0 = Sequential burst type. (Default)
1 = Reserved.