參數(shù)資料
型號: CL-PD6722
廠商: Cirrus Logic, Inc.
英文描述: ISA-TOOPC-CARD HOST ADAPTERS
中文描述: ISA的TOOPC卡主機適配器
文件頁數(shù): 62/128頁
文件大小: 1591K
代理商: CL-PD6722
PRELIMINARY DATA SHEET v3.1
CL-PD6710/’22
ISA–to–PC-Card Host Adapters
May 1997
62
EXTENSION REGISTERS
Bit 5 — Three-State Bit 7
This bit enables floppy change bit compatibility.
Bit 6 — DMA System (CL-PD6722 only)
On the CL-PD6710, this bit is reserved.
On the CL-PD6722, this bit is used to configure system interface signals for normal or DMA oper-
ation. At reset, the signals IRQ9, IRQ10, and -VPP_VALID are in non-DMA mode, and this bit is
set to ‘0’. When this bit is set to ‘1’, the IRQ9, IRQ10, and -VPP_VALID pins are reconfigured for
system bus DMA interfacing. Refer to
Chapter 14
for a functional description of these pins during
DMA operation.
Bit 7 — IRQ15 Is RI Out
This bit determines the function of the IRQ15 pin. When configured for ring indicate, IRQ15 is used
to resume a processor with NMI or SMI such as an 82486SL when a high-to-low change is detect-
ed on the -STSCHG pin.
0
1
Normal operation.
For socket I/O at address 03F7h and 0377h, do not drive bit 7.
0
1
Configured for non-DMA mode on the CL-PD6722.
Configured for DMA mode on the CL-PD6722.
0
1
Normal IRQ15 operation.
IRQ15 is connected to Ring Indicate pin on the host processor.
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