TMP92CZ26A
92CZ26A-651
4.3.3
SDRAM controller AC Characteristics
Variable
Parameter Symbol
Min Max
80 MHz 60 MHz
Unit
<STRC[2:0]>=000
T
12.5
16.6
1
Ref/Active to ref/active
command period
<STRC[2:0]>=110
t
RC
7T
87.5
116.2
<STRC[2:0]>=000
2T 12210
25.0
33.2
2
Active to precharge
command period
<STRC[2:0]>=110
t
RAS
7T
87.5
116.2
<STRCD>=0
T
12.5
16.6
3
Active to read/write
command delay time
<STRCD>=1
t
RCD
2T
25.0
33.2
<STRP>=0
T
12.5
16.6
4
Precharge to active
command period
<STRP>=1
t
RP
2T
25.0
33.2
<STRC[2:0]>=000
3T
37.5
49.8
5
Active to active
command period
<STRC[2:0]>=110
t
RRD
7T
87.5
116.2
<STWR>=0
T
12.5
16.6
6 Write recovery time
<STWR>=1
t
WR
2T
25.0
33.2
7 CLK cycle time
t
CK
T
12.5
16.6
0.5T
−
5
−
3.3
8 CLK high level width
t
CH
0.5T
−
3
3.25
−
0.5T
−
5
−
3.3
9 CLK low level width
t
CL
0.5T
−
3
3.25
−
10-1a
T
−
16
−
0.6
10-1b
Access time from CLK(CL
*
=
2)
<SRDS>=0(Read data shift OFF)
t
AC
T
−
16
- 3.5
−
10-2a
T
−
6.5
−
10.1
10-2b
Access time from CLK(CL
*
=
2)
<SRDS>=1(Read data shift ON)
t
AC
T
−
6.5
6
−
11 Output data hold time
t
OH
0 0
0
1Word/Single
t
DS
0.5T
−
4
2.25 3.3
12 Data-in set-up time
Burst
t
DS
0.5T
−
4
2.25 3.3
1Word/Single
t
DH
T
−
10
2.5 6.6
t
DH
0.5T
−
6
−
2.3
13 Data-in hold time
Burst
t
DH
0.5T
−
4
2.25
−
14 Address
set-up
time
t
AS
0.5T
−
4
2.25
4.3
0.5T
−
6
−
2.3
15 Address hold time
t
AH
0.5T
−
4
2.25
−
0.5T
−
5
−
3.3
16 CKE set-up time
t
CKS
0.5T
−
3
3.25
−
0.5T
−
5
−
3.3
17 Command
set-up
time
t
CMS
0.5T
−
3
3.25
−
0.5T
−
6
−
2.3
18 Command hold time
t
CMH
0.5T
−
4
2.25
−
19 Mode register set cycle time
t
RSC
T
12.5
16.6
ns
*
CL: CAS latency
AC measuring condition
SDCLK pin C
L
=
30 pF
,
Other pins C
L
=
50 pF