Electrical computers and digital data processing systems: input/ – Input/output data processing – Direct memory accessing
Patent
1997-02-18
2000-01-11
Cabeca, John W.
Electrical computers and digital data processing systems: input/
Input/output data processing
Direct memory accessing
710 23, 710 27, 710 28, 710 29, 710 31, 710 33, 710 34, 710 35, 710 37, 710 38, 710 62, 710 63, 710126, 710129, 710130, 710131, G06F 1316, G06F 1336
Patent
active
060147172
ABSTRACT:
A PCMCIA host adapter includes the capability to master a non-DMA system bus and control a DMA data transfer between a DMA capable peripheral and the internal system memory. A peripheral can be coupled to the system through a PCMCIA card plugged into a PCMCIA expansion slot. A DMA controller coupled to the PCMCIA expansion slots through a PCMCIA bus controls a DMA transfer between the internal system memory and the peripheral. A bus master disables the CPU and takes control of the system bus during a DMA data transfer. In an alternative embodiment, the PCMCIA host adapter can be used with either a system having a system bus with DMA capability or with a system having a system bus without DMA capability. In this alternate embodiment if the system bus has DMA capability, the PCMCIA host adapter effectively passes the DMA signals between the peripheral and the system bus. If the system bus does not have DMA capability then the DMA controller and the bus master work to disable the CPU and take control of the system bus during a DMA data transfer. The DMA controller then controls the transfer of data between the peripheral and the internal system memory.
REFERENCES:
patent: 4641261 (1987-02-01), Dwyer et al.
patent: 5237660 (1993-08-01), Weber et al.
patent: 5241630 (1993-08-01), Lattin, Jr. et al.
patent: 5335326 (1994-08-01), Nguyen et al.
patent: 5426739 (1995-06-01), Lin et al.
patent: 5426740 (1995-06-01), Bennett
patent: 5450551 (1995-09-01), Amim
patent: 5455915 (1995-10-01), Coke
patent: 5471590 (1995-11-01), Melo et al.
M. Morris Mano, "Digital Logic and Computer Design", Microcomputer System Design, Prentice Hall, Inc. Englewood Cliffs, N.J., pp. 547-552, 1979.
J. D. Greenfield, "Practical Digital Design Using ICs", Computer Interfaces, Second Edition, John Wiley & Sons, pp. 546-553, 1977.
T. Shanley and D. Anderson, "ISA System Architecture", PC System Architecture Series, New revised edition, vol. 1, Chap. 19, Mind Share Press, pp. 367-395, 1993.
Data Sheet for PCI-To-PCMCIA Host Adapters CL-PD6730/PD6732, Circus logic Jan. 94 pp. 1-123.
Bezzant Daniel G.
Dikshit Ashutosh S.
Narayanan Puducode S.
Nookala Narasimha R.
Smith Stephen A.
Bell Robert P.
Cabeca John W.
Cirrus Logic Inc.
Nguyen Frank D.
Owens Jonathan O.
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