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22.5 AC Characteristics
22.5.1
MASTERCLK AC Characteristics
Parameter
MASTERCLK Period
( * 1)
MASTERCLK Frequency
MASTERCLK High
MASTERCLK Low
Internal Operating Frequency
MASTERCLK Rise Time
MASTERCLK Fall Time
*1:
Proper circuit operation of the TX4925 is guaranteed only when power supply to it is stable and the on-chip PLL is enabled.
0.8 V
MASTERCLK
0.2 V
22.5.2
Power On AC Characteristics
Parameter
PON* width time
PLL stable time
RESET* width time
MASTERCLK
Stable time
Vdd
//
MASTERCLK
RESET*
PON*
PLL Output
CPUCLK
GBUSCLK
PCICLK
Note:
V
and V
CCInt
CCIO
The difference of the start up time is within 100 m seconds.
(Tc = 0 ~ 70°C, V
CCIO
SYM
Condition
t
MCP
f
MCK
t
MCH
t
MCL
f
CPU
t
MCR
t
MCF
t
MCP
CC
CC
Figure 22.5.1 Timing Diagrams: MASTERCLK
(Tc = 0 ~ 70°C, V
CCIO
SYM
Condition
t
MCO_PLL
t
MCP_PLL
t
MCH_PLL
//
//
//
//
//
//
t
MCO_PLL
t
MCP_PLL
must start up simaltaneously, or V
Figure 22.5.2 Timing Diagrams: POWER ON RESET
22-4
Chapter 22 Electrical Characteristics
= 3.3 V ± 0.3 V, V
= 1.5 V ± 0.1 V, V
CCInt
Min.
50
⎯
3
3
25
⎯
⎯
t
t
MCL
MCH
t
t
MCR
MCF
= 3.3 V ± 0.3 V, V
= 1.5 V ± 0.1 V, V
CCInt
Min.
1
10
1
//
//
//
//
//
//
t
MCH_PLL
must be first.
CCInt
= 0 V)
SS
Max.
Unit
⎯
ns
20
MHz
⎯
ns
⎯
ns
200
MHz
2
ns
2
ns
= 0 V)
SS
Max.
Unit
⎯
ms
⎯
ms
⎯
ms
//
//
//
//
//
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