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XRT79L74IB Datasheet(PDF) 9 Page - Exar Corporation |
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XRT79L74IB Datasheet(HTML) 9 Page - Exar Corporation |
9 / 70 page PRELIMINARY XRT79L74 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC REV. P1.0.0 7 PIN #NAME TYPE DESCRIPTION GENERAL PURPOSE INPUT AND OUTPUT PINS U3 N26 W5 R24 DMO1 DMO2 DMO3 DMO4 O O O O Drive Monitor Output Pins: For each channel, if the DMO output signal is "High", then it means that the drive monitor circuitry within the XRT79L74 has not detected any bipolar signals at the MTIP and MRING inputs (or via the Internal Drive Monitor circuit) within the last 128 ± 32 bit periods. If this output signal is "Low", then it means that bipolar sig- nals are being detected at the MTIP and MRING input pins of the XRT79L74. W1 W2 W3 W4 GPIO_0 GPIO_1 GPIO_2 GPIO_3 I/O General Purpose Input/Output Pins: Each of these pins can be configured to function as either a general-purpose input or output pin. If a given pin (GPIO_X) is configured to function as an input pin, then the state of this input pin can be monitored by reading Bit X within the "Oper- ation General Purpose Pin Data" Register (Address Location = 0x0147). If a given pin is configured to function as an output pin, then the state of this out- put pin (GPIO_X) can be controlled by writing the appropriate value into Bit X within the "Operation General Purpose Pin Data" Register. Finally, the user can configure a given GPIO_X pin to be an input pin by setting Bit X, within the "Operation General Purpose Pin Direction Control Register (Address = 0x014B) to "0". Conversely, the user can configure the GPIO_X pin to be an output pin by setting Bit X, within the "Operation General Purpose Pin Direction Control" Register (Address = 0x014B) to "1". PIN #NAME TYPE DESCRIPTION TRANSMIT SYSTEM SIDE INTERFACE PINS AC4 NibbleIntf I Nibble Interface Select Input pin: This input pin permits the user to configure the Transmit Payload Data Input Interface and the Receive Payload Data Output Interface blocks to operate in either the "Serial" or the "Nibble-Parallel" Mode. Setting this input pin "high" configures each of these blocks to operate in the Nibble-Parallel Mode. In this mode, the "Transmit Payload Data Input Interface" block will accept the "outbound" payload data (from the System-Side terminal equipment) in a "nibble-parallel" manner via the "TxNib[3:0]" input pins. Further, the Receive Payload Data Output Interface block will output "inbound" payload data (to the System-Side terminal equipment) in a "nibble-parallel" via the "RxNib[3:0] output pins. Setting this input pin "low" configures each of these blocks to operate in the Serial Mode. In this mode, the Transmit Payload Data Input Interface block will accept the "outbound" payload data (from the System-Side terminal equipment) in a "serial" manner via the "TxSer" input pin. Further, the Receive Payload Data Output Interface block will output the "inbound" payload data (to the System-Side terminal equipment) in a serial manner, via the "RxSer" output pin.NOTE: NOTE: This input pin is only active if the XRT79L74 device has been configured to operate in the Clear-Channel Framer Mode. The user is advised to tie this input pin to GND if the user intends to configure the XRT79L74 device to operate in the ATM UNI or PPP Modes. |
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