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STPCC5HEBC 数据表(PDF) 39 Page - STMicroelectronics |
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STPCC5HEBC 数据表(HTML) 39 Page - STMicroelectronics |
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39 / 93 page  ELECTRICAL SPECIFICATIONS Release 1.5 - January 29, 2002 39/93 4.5.2 RESET SEQUENCE Figure 4-4 describes the reset sequence of the STPC, also called warm reset. The constraints on the strap options and the bus activities are the same as for the cold reset. The SYSRSTI# pulse duration must be long enough to have all the strap options stabilized and must be adjusted depending on resistor values. It is mandatory to have a clean reset pulse without glitches as the STPC could then sample invalid strap option setting and enter into an umpredicta- ble mode. While SYSRSTI# is active, the PCI clock PLL runs in open loop mode at a speed of few 100’s KHz. Figure 4-4. Reset timing diagram S trap O ptions SYSRSTI# SYSRSTO # 14 M Hz VA LID CONFIG URATIO N HCLK PCI_CLK 2.3 m s IS AC LK 1.6 V MD[63:0] |
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