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參數(shù)資料
| 型號： | UPD488448FB-C80-45-DQ1 |
| 廠商： | NEC Corp. |
| 英文描述： | 128 M-bit Direct Rambus⑩ DRAM |
| 中文描述： | 128 M位DRAM的直接Rambus的⑩ |
| 文件頁數(shù)： | 43/80頁 |
| 文件大小： | 1902K |
| 代理商： | UPD488448FB-C80-45-DQ1 |
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Data Sheet M14837EJ3V0DS00
43
μ
PD488448 for Rev. P
Figure 22-1 Control Registers (3/7)
Control Register : REFB
Address : 041
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
REFB4..0
Read/write register.
Field
Description
Reset
value
0
REFB4..0
Refresh Bank Register. REFB4..REFB0 is the bank that will be refreshed next during self-refresh. REFB4..0
is incremented after each self-refresh activate and precharge operation pair.
Control Register : REFR
Address : 042
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
REFR8..0
Read/write register.
Field
Description
Reset
value
0
REFR8..0
Refresh Row register. REFR8..REFR0 is the row that will be refreshed next by the REFA command or by
self-refresh. REFR8..0 is incremented when BR4..0=11111 for the REFA command. REFR8..0 is
incremented when REFB4..0=11111 for self-refresh.
Control Register : CCA
Address : 043
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
ASYM
A0
CCA6..0
Read/write register.
Field
Description
Reset
value
0
ASYMA0 control the asymmetry of the V
OL
/V
OH
voltage swing about the V
REF
reference voltage for the
DQA7..0 pins.
ASYMA0
ODF
0
0.00
1
0.12
Where ODF is the Over Drive Factor (the extra I
OL
current sunk by an RSL output when ASYMA0 is set).
Current Control A. Controls the I
OL
output current for the DQA7..DQA0 pins.
ASYMA0
CCA6..0
Control Register : CCB
Address : 044
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
ASYM
B0
CCB6..0
Read/write register.
Field
Description
Reset
value
0
ASYMB0 control the asymmetry of the V
OL
/V
OH
voltage swing about the V
REF
reference voltage for the
DQB7..0 pins.
ASYMB0
ODF
0
0.00
1
0.12
Where ODF is the Over Drive Factor (the extra I
OL
current sunk by an RSL output when ASYMB0 is set).
Current Control B. Controls the I
OL
output current for the DQB7..DQB0 pins.
ASYMB0
CCB6..0
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