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參數(shù)資料
| 型號： | SME5224AUPA-360 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 360 MHz, RISC PROCESSOR |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 373K |
| 代理商： | SME5224AUPA-360 |
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SME5224AUPA-360
360 MHz CPU, 4.0 MB E-Cache
UltraSPARC-II CPU Module
July 1999
Sun Microsystems, Inc
LOW VOLTAGE PECL
Two trace signals compose each clock: one positive signal and one negative signal. Each signal is 180-degrees
out of phase with the other. Signal timing is referenced to when the positive LVPECL signal transitions from
low to high at the cross-over point, when the negative signal transitions from high to low. The trace-pair are
routed side-by-side and use parallel termination, (specic routing techniques are require).
CPU CLOCK INPUT
The PLL in the CPU doubles the clock frequency presented at its clock pin. So, for a 360 MHz core CPU clock
frequency, the CPU_CLK signal is 180 MHz. Therefore, for the CPU, actions will appear to occur at both tran-
sitions of the input CPU_CLK.
CLOCK TRACE DELAYS
The LVPECL propagation time is constant for all clock signals so all balancing is based on length rather than
time. All LVPECL traces are striplines (dielectric and power planes top and bottom) with a xed 180 ps per
inch propagation time using the FR4, PCB Dielectric.
Clock Buffer
SRAM
UDB-II
SRAM/TAG
UltraSPARC-II
CPU
Clock
Buffer
Clock
Divider
CPU_CLK
UPA_CLK0
UPA_CLK1
UPA_CLK2
UPA_CLKx
UPA_CLK
UPA Device
Module
Connector
Module Boundary
Clock
Generator
UDB-II
UPA Device
Serial
Parallel
Figure 3. Clock Signal Distribution
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