AL103 Revision 1.0
Table 44: SGRAM Read Timing
SYMBOL
tAC
DESCRIPTION
MIN
-
TYP
MAX
UNIT
ns
Access time.
-
-
-
-
10
-
tAH
Access hold time.
Access setup time.
2
ns
tAS
2.5
1
-
ns
tCH
PBCS#, PBRAS#, PBWE# hold
time.
-
ns
tCHI
tCK
Clock high level width.
System clock cycle time.
CKE hold time.
3
13
2
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
tCKH
tCKS
tCL
CKE setup time.
3
Clock low level width.
3
tCS
PBCS#, PBRAS#, PBWE#
setup time.
2.5
tHZ
tLZ
tOH
tRAS
Data out high impedance time.
Data out low impedance time.
Data out hold time.
-
2
-
-
-
-
8
-
ns
ns
ns
ns
2
-
Active to precharge command
period.
48
-
tRCD
Active to read delay.
24
-
-
ns
Note: This timing requirement is for a SGRAM running at CAS Latency 2. Typically
a -8 speed grade SGRAM needs to be used.
9/00
Reference Only / Allayer Communications
55
ABC [ ABC Taiwan Electronics Corp ]
