參數(shù)資料
型號: 79RC32435
廠商: Integrated Device Technology, Inc.
英文描述: IDTTM InterpriseTM Integrated Communications Processor
中文描述: IDTTM InterpriseTM集成通信處理器
文件頁數(shù): 16/53頁
文件大小: 444K
代理商: 79RC32435
16 of 53
January 19, 2006
IDT 79RC32435
S ystem Clock Parameters
(Values based on systems running at recommended supply voltages and operating temperatures, as shown in Tables 15 and 16.)
Figure 3 Clock Parameters Waveform
Parameter
S ymbol
Referenc e
Edge
266MHz
300MHz
350MHz
400MHz
Units
T iming
Diagram
Referenc e
Mn
Max
Mn
Max
Min
Max
Mn
Max
PCLK
1
1.
The CPU pipeline clock (PCLK) speed is selected during cold reset by the boot configuration vector (see Table 3). Refer to Chapter 3, Clocking and Initialization, in the RC32435
User Reference Manual for the allowable frequency ranges of CLK and PCLK.
2.
ICLK is the internal IPBus clock. It is always equal to PCLK divided by 2. This clock cannot be sampled externally.
3.
The ethernet clock (MIIxRXCLK and MIIxTXCLK) frequency must be equal to or less than 1/2 ICLK (MIIxRXCLK and MIIxTXCLK <= 1/2(ICLK)).
4.
PCICLK must be equal to or less than two times ICLK (PCICLK <= 2(ICLK)) with a maximumPCICLK of 66 MHz.
5.
The input clock (CLK) is input fromthe external oscillator to the internal PLL.
Frequency
none
200
266
200
300
200
350
200
400
MHz
See Figure 3.
Tper
3.8
5.0
3.3
5.0
2.85
5.0
2.5
5.0
ns
ICLK
2,3,4
Frequency
none
100
133
100
150
100
175
100
200
MHz
Tper
7.5
10.0
6.7
10.0
5.7
10.0
5.0
10.0
ns
CLK
5
Frequency
none
25
125
25
125
25
125
25
125
MHz
Tper_5a
8.0
40.0
8.0
40.0
8.0
40.0
8.0
40.0
ns
Thigh_5a,
Tlow_5a
40
60
40
60
40
60
40
60
% of
Tper_5a
Trise_5a,
Tfall_5a
3.0
3.0
3.0
3.0
ns
Tjitter_5a
0.1
0.1
0.1
0.1
ns
Table 5 Clock Parameters
Tlow_5a
Thigh_5a
Tper_5a
CLK
Trise_5a
Tfall_5a
Tjitter_5a
Tjitter_5a
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