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PPC440EP 数据表(PDF) 54 Page - Applied Micro Circuits Corporation |
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PPC440EP 数据表(HTML) 54 Page - Applied Micro Circuits Corporation |
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54 / 84 page  54 AMCC Proprietary 440EP – PPC440EP Embedded Processor Revision 1.26 – April 25, 2007 Data Sheet External Master Peripheral Interface BusReq Bus Request. Used when the PPC440EP needs to regain control of peripheral interface from an external master. O Multiplex ExtAck External Acknowledgement. Used by the PPC440EP to indicate that a data transfer occurred. O Multiplex ExtReq External Request. Used by an external master to indicate it is prepared to transfer data. I Multiplex 1, 4 ExtReset Peripheral Reset. Used by an external master and by synchronous peripheral slaves. O3.3V LVTTL HoldAck Hold Acknowledge. Used by the PPC440EP to transfer ownership of peripheral bus to an external master. O Multiplex HoldReq Hold Request. Used by an external master to request ownership of the peripheral bus. I Multiplex 1, 5 HoldPri Hold Primary. Used by an external master to indicate the priority of a given external master tenure. I Multiplex PerClk Peripheral Clock. Used by an external master and by synchronous peripheral slaves. O3.3V LVTTL UART Peripheral Interface UARTSerClk Serial clock input that provides an alternative to the internally generated serial clock. Used in cases where the allowable internally generated clock rates are not satisfactory. I 3.3V LVTTL 1, 4 UARTn_Rx UART Receive data. I 3.3V LVTTL 1, 4 UARTn_Tx UART Transmit data. O 3.3V LVTTL 4 UARTn_DCD UART Data Carrier Detect. I 3.3V LVTTL 6 UARTn_DSR UART Data Set Ready. I 3.3V LVTTL 6 UARTn_CTS UART Clear To Send. I 3.3V LVTTL 1, 4, 6 UARTn_DTR UART Data Terminal Ready. O 3.3V LVTTL 4 UARTn_RTS UART Request To Send. O 3.3V LVTTL 4 UARTn_RI UART Ring Indicator. I 3.3V LVTTL 1, 4 IIC Peripheral Interface IIC0SClk IIC0 Serial Clock. I/O 3.3V LVTTL 1, 2 IIC0SData IIC0 Serial Data. I/O 3.3V LVTTL 1, 2 IIC1SClk IIC1 Serial Clock. I/O Multiplex IIC1SData IIC1 Serial Data. I/O Multiplex Table 6. Signal Functional Description (Sheet 5 of 9) Notes: 1. Receiver input has hysteresis 2. Must pull up (recommended value is 3k Ω to 3.3V) 3. Must pull down (recommended value is 1k Ω) 4. If not used, must pull up (recommended value is 3k Ω to 3.3V) 5. If not used, must pull down (recommended value is 1k Ω) 6. Strapping input during reset; pull-up or pull-down required Signal Name Description I/O Type Notes |
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