Lines Matching +full:external +full:- +full:memory +full:- +full:controller

37 .Bd -ragged -offset indent
48 .Bd -literal -offset indent
60 fast, ultra or ultra2 synchronous transfers depending on controller type,
64 .Tn SCSI-Select
72 For systems that store non-volatile settings in a system specific manner
73 rather than a serial eeprom directly connected to the aic7xxx controller,
78 many chip-down motherboard configurations.
88 .Bd -ragged -offset indent
89 .Bl -column "aic7895CX" "MIPSX" "PCI/64X" "MaxSyncX" "MaxWidthX" "SCBsX" "2 3 4 5 6 7 8X"
106 .Bl -enum -compact
108 Multiplexed Twin Channel Device - One controller servicing two busses.
110 Multi-function Twin Channel Device - Two controllers on one chip.
112 Command Channel Secondary DMA Engine - Allows scatter gather list and
115 64 Byte SCB Support - SCSI CDB is embedded in the SCB to eliminate an extra DMA.
117 Block Move Instruction Support - Doubles the speed of certain sequencer
121 style Scatter Gather Engine - Improves S/G prefetch performance.
123 Queuing Registers - Allows queueing of new transactions without pausing the
126 Multiple Target IDs - Allows the controller to respond to selection as a
132 To allow PCI adapters to use memory mapped I/O if enabled:
134 .Cd options AHC_ALLOW_MEMIO=(0 -- disabled, 1 -- enabled)
135 .Bd -ragged -offset indent
136 Memory mapped I/O is more efficient than the alternative, programmed I/O.
139 sitting behind a PCI->PCI bridge, the BIOS may fail to properly initialize
140 the chip for memory mapped I/O. The typical symptom of this problem is a
141 system hang if memory mapped I/O is attempted.
151 .Bd -ragged -offset indent
164 .Bl -tag -width indent
167 (0 -- disabled, 1 -- enabled).
169 A hint to define whether memory mapped io is enabled or disabled for this
170 adapter, defaults to enabled (0 -- disabled, 1 -- enabled).
179 controller cards:
181 .Bl -bullet -compact
330 Many motherboards with on-board
339 controller to process a transaction.
341 the number of SCBs that can be stored in on-chip memory.
344 SCB space to be augmented with external SRAM up to a maximum of 255 SCBs.
345 Very few Adaptec controller configurations have external SRAM.
347 If external SRAM is not available, SCBs are a limited resource.
354 a concept similar to memory paging.
357 periods of time without talking to the controller.
358 The SCBs for disconnected transactions are only of use to the controller
361 for the controller to execute, the controller firmware will use a
365 saved, via dma, to host memory, and the local SCB reused to start
367 This allows the controller to queue up to
389 sequencer-code assembler,
400 .Tn SCSI-Select