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PM73121 Datasheet(PDF) 98 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 98 Page - PMC-Sierra, Inc |
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98 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ 4.3 Pin Descriptions 4.3.1 UTOPIA Interface Signals NOTE: Unless stated otherwise, the maximum output current (I MAX) is 4 mA. Table 6. UTOPIA Interface Signals ATM Mode Signal PHY Mode Signal Pin # Type Reset Value* Description PHY_ENABLE PHY_ENABLE 56 In NA PHY_ENABLE determines which UTOPIA mode the UTOPIA interface is configured. When 0, the chip is configured with an ATM layer UTOPIA interface and when 1, the chip is configured with a PHY layer UTOPIA interface. An internal pulldown resistor will default the chip to the ATM layer mode if left unconnected. TATM_CLK RPHY_CLK 20 In NA ATM: Transmit UTOPIA ATM Layer Clock is the synchronization clock input for synchronizing data output on TATM_DATA. PHY: Receive UTOPIA PHY Layer Clock is the synchronization clock input for synchronizing data output on RPHY_DATA. Maximum frequency is 33 MHz. TATM_SOC RPHY_SOC 24 Out 0(ATM) Z(PHY) ATM: Transmit UTOPIA ATM Layer Start-Of-Cell is an active high signal asserted by the AAL1gator II when TATM_DATA contains the first valid byte of the cell. PHY: Receive UTOPIA PHY Layer Start-Of-Cell is an active high signal asserted by the AAL1gator II when RPHY_DATA contains the first valid byte of the cell. In SPHY mode, the AAL1gator II drives this signal only in cycles following those with /RPHY_EN asserted. In MPHY mode, the AAL1gator II drives this signal only when the ATM layer has selected it for a cell transfer. Maximum output current (I MAX) = 8 mA. TATM_DATA(7:4) TATM_DATA(3) TATM_DATA(2:0) RPHY_DATA(7:4) RPHY_DATA(3) RPHY_DATA(2:0) 25-28 30 32-34 Out 0(ATM) Z(PHY) ATM: Transmit UTOPIA ATM Layer Data Bits 7 to 0 form the byte-wide data driven to the PHY layer. Bit 0 is the Least Significant Bit (LSB). Bit 7 is the Most Significant Bit (MSB) and should be transmitted first. PHY: Receive UTOPIA PHY Layer Data Bits 7 to 0 form the byte-wide data driven to the ATM layer. In SPHY mode, the AAL1gator II drives this bus only in cycles following those with /RPHY_EN asserted. In MPHY mode, the AAL1gator II drives this bus only when the ATM layer has selected it for a cell transfer. Bit 0 is the LSB. Bit 7 is the MSB and should be transmitted first. Maximum output current (I MAX) = 8 mA. |
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