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AM53C94JC

High Performance SCSI Controller

GENERALDESCRIPTION TheHighPerformanceSCSIController(HPSC)hasaflexiblethreebusarchitecture.TheHPSChasa16-bitDMAinterface,an8bithostdatainterfaceandan8-bitSCSIdatainterface.TheHPSCisdesignedtominimizehostinterventionbyimplementingcommonSCSIsequencesinha

AM53C94JC

High Performance SCSI Controller;

GENERAL DESCRIPTION\nThe High Performance SCSI Controller (HPSC) has a flexible three bus architecture. The HPSC has a 16-bit DMA interface, an 8 bit host data interface and an 8-bit SCSI data interface. The HPSC is designed to minimize host intervention by implementing common SCSI sequences in hardware. An on-chip state machine reduces protocol overheads by performing the required sequences in response to a single command from the host. Selection, reselection, information transfer and disconnection commands are directly supported.DISTINCTIVE CHARACTERISTICS\n■ Pin/function compatible with NCR53C94/53C96\n■ AMD’s Patented GLITCH EATERTM Circuitry on REQ and ACK inputs\n■ 5 Mbytes per second synchronous SCSI transfer rate\n■ 20 Mbytes per second DMA transfer rate\n■ 16-bit DMA Interface plus 2 bits of parity\n■ Flexible three bus architecture\n■ Single ended SCSI bus supported by Am53C94\n■ Single ended and differential SCSI bus supported by Am53C96\n■ Selection of multiplexed or non-multiplexed address and data bus\n■ High current drivers (48 mA) for direct connection to the single ended SCSI bus\n■ Supports Disconnect and Reselect commands\n■ Supports burst mode DMA operation with a threshold of 8\n■ Supports 3-byte-tagged queuing as per the SCSI-2 specification\n■ Supports group 2 and 5 command recognition as per the SCSI-2 specification\n■ Advanced CMOS process for low power consumption\n■ Am53C94 available in 84-pin PLCC package\n■ Am53C96 available in 100-pin PQFP package

AM53C94

HighPerformanceSCSIController

GENERALDESCRIPTION TheHighPerformanceSCSIController(HPSC)hasaflexiblethreebusarchitecture.TheHPSChasa16-bitDMAinterface,an8bithostdatainterfaceandan8-bitSCSIdatainterface.TheHPSCisdesignedtominimizehostinterventionbyimplementingcommonSCSIsequencesinha