公开(公告)号：US5625800A

公开(公告)日：1997-04-29

申请号：US269491

申请日：1994-06-30

申请人： Michael D. Brayton ,  Charles S. Fannin ,  B. Arlen Young

发明人： Michael D. Brayton ,  Charles S. Fannin ,  B. Arlen Young

IPC分类号： G06F13/38 ,  G06F13/12 ,  G06F13/14

CPC分类号： G06F13/387

摘要： The performance of a host adapter integrated circuit is enhanced by storing blocks of information for SCSI I/O target commands, i.e, hardware request blocks, in a structure external to the host adapter integrated circuit. Since the number of blocks that is stored in the external structure is typically significantly greater than the number of blocks that can be stored in onboard registers of the host adapter integrated circuit, a high speed method for retrieving information from a particular block within the external structure is provided so that the appropriate block of information can be passed to the host adapter integrated circuit without delays associated with serially scanning through all of the blocks. Several structures are used in the external memory to manage the hardware request blocks. The structures include a hardware request block array, a hardware request block address array, a queue-in FIFO structure, a queue-out FIFO structure and a busy targets table.

摘要翻译： 主机适配器集成电路的性能通过将SCSI I / O目标命令（即硬件请求块）的信息块存储在主机适配器集成电路外部的结构中来增强。 由于存储在外部结构中的块的数量通常显着大于可以存储在主机适配器集成电路的板载寄存器中的块的数量，所以用于从外部结构中的特定块检索信息的高速方法 被提供使得适当的信息块可以被传递到主机适配器集成电路，而没有与通过所有块的串行扫描有关的延迟。 在外部存储器中使用几种结构来管理硬件请求块。 这些结构包括硬件请求块阵列，硬件请求块地址阵列，队列FIFO结构，队列FIFO结构和繁忙的目标表。