TMP92CF30
2009-06-12
92CF30-556
4.3.3
SDRAM controller AC Characteristics
Variable
No. 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 (Note1)
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 (Note2)
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
8 CLK high level width
t
CH
0.5T
−
3 3.25 5.3
9 CLK low level width
t
CL
0.5T
−
3 3.25 5.3
10-1
Access time from CLK(CL
*
=
2)
<SRDS>
=
“0”(Read data shift OFF)
t
AC
T
−
16 -
3.5 0.6
10-2
Access time from CLK(CL
*
=
2)
<SRDS>
=
“1”(Read data shift ON)
t
AC
T
−
6.5 6 10.1
11 Data hold time from internal read
t
HR
0 0
0
1Word/Single
t
DS
0.5T
−
4 2.25 4.3
12 Data
set-up
time
Burst
t
DS
0.5T
−
4 2.25 4.3
1Word/Single
t
DH
T
−
10 2.5
6.6
13 Data hold time
Burst
t
DH
0.5T
−
4 2.25 4.3
14 Address set-up time
t
AS
0.5T
−
4 2.25 4.3
15 Address hold time
t
AH
0.5T
−
4 2.25 4.3
16 CKE set-up time
t
CKS
0.5T
−
3 3.25 5.3
17 Command set-up time
t
CMS
0.5T
−
3 3.25 5.3
18 Command hold time
t
CMH
0.5T
−
4 2.25 4.3
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
Note1: The Minimum cyclye of “Active to pre-charge command period” is 2T (2 clocks) because the cycle of
“READ/WRITE + PRECHARGE” occur by SDCISR<STRC2:0>=”000”, “001” and ”010”. If other settigs the
above setiing, the clolck is value of “Register setting velue +1”. (ex. if “010” setting, the clock is 3clocks.)
Note 2: The Minimum cyclye of “Active to active command period” is 3T (3 clocks) because the clycle of
“READ/WRITE + PRE ACTIVE” occur by SDCISR<STRC2:0>=”000”, “001” and ”010”. If other
settigs the above setiing, the clolck is value of “Register setting velue +1”. (ex. if “011” setting, the clock is 4
clocks.)
Содержание TLCS-900/H1 Series
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