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AL103 Revision 1.0
9/00
Reference Only / Allayer Communications
57
Note:
This timing requirement is for a SGRAM running at CAS Latency 2. Typically
a -8 speed grade SGRAM needs to be used.
Table 45: SGRAM Write Timing
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
tAH
Access hold time.
2
-
-
ns
tAS
Access setup time.
2.5
-
-
ns
tCH
PBCS#, PBRAS#, PBWE# hold
time.
1-
-
ns
tCHI
Clock high level width.
3
-
-
ns
tCK
System clock cycle time.
13
-
-
ns
tCKH
CKE hold time.
2
-
-
ns
tCKS
CKE setup time.
3
-
-
ns
tCL
Clock low level width.
3
-
-
ns
tCS
PBCS#, PBRAS#, PBWE#
setup time.
2.5
-
-
ns
tDH
Data in hold time.
1
-
-
ns
tDS
Data in setup time.
2.5
-
-
ns
tRAS
Active to precharge command
period.
48
-
100,000
ns
tRCD
Active to read delay.
24
-
-
ns
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