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VIA Technologies, Inc.
Preliminary VT6508 Datasheet
-46-
AC CHARACTERISTICS
AC timing specifications provided are based on external zero-pf capacitance load. Min/Max
cases are based on the following table:
Parameter
Min
Max
Unit
3.3V power (Vcc)
3.135
3.465
V
Temperature
0
95
oC
- SRAM interface Timing Characteristics
SETUP
HOLD
MIN
MAX
UNIT
SA output delay
2
7
SD input
2.5
1.5
SD output delay
2
7
SADS
2
7
SCS0
2
7
SWE
2
7
-
RMII Interface Timing Characteristics
Parameter
min
type
max
unit
condition
RCLK50 cycle time
20
ns
RXD CRS_DV setup time
4
-
-
ns
to RCLK50 rising
edge
RXD CRS_DV hold time
2
-
-
ns
to RCLK50 rising
edge
TXD TX_EN output
delay
3
-
12
ns
to RCLK50 rising
edge
-
Management Interface (MI) Timing Characteristics
Parameter
min
typ
max
unit
condition
MDC cycle time -
400
-
ns
MDC high time
180
200
220
ns
MDC low time
180
200
220
ns
MDIO setup time
(source by PHY)
30
-
-
ns
to MDC rising
edge
MDIO hold time
(source by PHY)
0
-
-
ns
to MDC rising
edge
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