53 / 66 page
AL103 Revision 1.0
9/00
Reference Only / Allayer Communications
53
Figure 12
PHY Management Write Timing
Table 42: PHY Management (MDIO) Write Timing
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
tch
MDC high time.
420
425
430
ns
tcl
MDC low time.
420
425
430
ns
tmc
MDC period.
840
850
860
ns
td
MDIO output delay.
40
-
52
ns
Table 43: SGRAM Refresh Timing
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
tAH
Access hold time.
1
-
-
ns
tAS
Access setup time.
3
-
-
ns
tCH
PBCS#, PBRAS#, PBWE# hold time.
1
-
-
ns
tCHI
Clock high level width.
3.5
-
-
ns
tCK
System clock cycle time.
10
-
-
ns
tCKH
CKE hold time.
1
-
-
ns
tCKS
CKE setup time.
3
-
-
ns
tCL
Clock low level width.
3.5
-
-
ns
tCS
PBCS#, PBRAS#, PBWE# setup time.
3
-
-
ns
tRP
Precharge command period.
30
-
-
ns
tRC
Auto-refresh to auto-refresh period.
90
-
-
ns
t
cl
t
ch
MDC
MDIO
t
mc
t
d
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