GENERAL DESCRIPTION
The Enhanced SCSI-2 Controller (ESC) was designed to support Fast SCSI-2 transfer rates of up to 10 Mbytes/s in synchronous mode and up to 7 Mbytes/s in the asynchronous mode. The ESC is downward compatible with the Am53C94/96, combining its functionality with features such as Fast SCSI, programmable Active Negation, a 24-bit transfer counter, and a part-unique ID code containing manufacturer and serial # information. AMD’s proprietary features such as power-down mode for SCSI transceivers, programmable GLITCH EATER, and extended Target command set are also included for improved product performance. The Enhanced SCSI-2 Controller (ESC) has a flexible three bus architecture. The ESC has a 16-bit DMA interface, an 8-bit host data interface and an 8-bit SCSI data interface. The ESC 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.
Advanced Micro Devices
