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MC141555 bảng dữ liệu(PDF) 7 Page - Motorola, Inc |
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MC141555 bảng dữ liệu(HTML) 7 Page - Motorola, Inc |
7 / 16 page MC141555 7 MOTOROLA SYSTEM DESCRIPTION MC141555 is booted up from the Power-On Reset which will initialize all the internal hardware circuitry and reset the program counter of the internal processor. During Power-On Reset, MC141555 must be set to the desired configuration by the input states of the pins, OVR5/GANG, PWRSW5, DP5/SEL1 and DM5/SEL0. See Table1 Configuration Selection for detail. After Power-On, the Hub Repeater will handle the con- nectivity in per packet basis, and all downstream ports tran- sition to the powered off state. After all initialization, the Hub Controller takes over the responsibility for receiving Host’s commands, Downstream Power Management and to report status in per port basis while Repeater is detecting the con- nectivity of each downstream port. MC141555 accepts the Host Reset request to generate a per port reset and receives reset signalling from root port to complete its own reset sequence. HUB CONFIGURATION MC141555 can be configured as one of the three operating modes: Self Power Mode with Individual Control, Bus Power Mode with Individual Control and Bus Power Mode with Ganged Control. (a) Self-powered Mode with Individual Control (Monitor Application) During Power-On Reset, pull DP5/SEL1 and DM5/SEL0 low to select this mode. Meanwhile, MC141555 is configured to be self powered with 5 downstream ports whose power management is in Individual Control; that is, after Power-On Reset, DP5/SEL1 acts as DP5, DM5/SEL0 acts as DM 5 and OVR5/GANG acts as OVR5 . (b) Bus-powered Mode with Individual Control During Power-On Reset, pull DP5/SEL1 low, pull OVR5/ GANG and DM5/SEL0 high to select this mode. Meanwhile, MC141555 is configured to be bus powered with 4 down- stream ports whose power management is in Individual Con- trol; that is, after Power-On Reset, DP5/SEL1, DM5/SEL0, OVR5/GANG and PWRSW5 have no further usage. (c) Bus-powered Mode with Ganged Control During Power-On Reset, pull DP5/SEL1 and OVR5/ GANG low and pull DM5/SEL0 high to select this mode. Meanwhile, MC141555 is configured to be bus-powered with 4 downstream ports whose power management is in Ganged Control. In this mode, only PWRSW1 and OVR1 are dedicated to power management for all 4 downstream ports. All three operating modes with pin input states during Power-On Reset are summarized in Table 1. Table 1. Configuration Selection X: don’t care DP5/ SEL1 DM5/ SEL0 PWRSW5 OVR5/ GANG Configuration 0 0 PWRSW5 OVR5 Self Power & Individu- al Control 0 1 X 1 Bus Power & Individu- al Control 0 1 X 0 Bus Power & Ganged Control Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Số phần tương tự - MC141555 |
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Mô tả tương tự - MC141555 |
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