Interface device for controlling command and data transfer between a host computer and a disk controller
First Claim
1. Interface device for controlling the command and data transfer between a host computer and a disk controller, the host computer comprising a first data bus, an address bus, and first control-signal lines, and the disk controller comprising a second data bus and second, third, and fourth control-signal lines, characterized in that the interface device contains a first internal bus and a second internal bus which are interconnected via a first controlled buffer for a first direction of transfer and via a second controlled buffer for a second direction of transfer, that a first check-bit generator and a second check-bit generator are coupled to the first internal bus, that the first data bus is connected to the second internal bus via a third controlled buffer, that the second data bus is connected to the first internal bus via a fourth controlled buffer, that the address bus and the first, second, and third control-signal lines are connected to an interface controller, that the host computer is connected with the interface controller via the address bus and the first control-signal lines, that the disk controller is connected with the interface controller via the second and third control-signal lines, that to transfer a status word indicating the status of the disk controller the third and fourth control-signal lines from the disk controller are connected to the second internal bus via a fifth controlled buffer and an error-signal line is connected to an output of the second check-bit generator and to the second internal bus via the fifth controlled buffer, that the first and second check-bit generators are connected to a sixth controlled buffer linked to the disk controller by a check-bit line, and that the interface controller is connected to the controlled buffers by internal control-signal lines.
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Abstract
To control the transfer of commands and data, an interface device is connected to a host computer by a first data bus, an address bus, and first control-signal lines, and to a disk controller by a second data bus and second, third, and fourth control-signal lines. The interface device includes a first internal bus and a second internal bus interconnected via a first controllable buffer and a second controllable buffer, with the first data bus connected to the second internal bus through a third controllable buffer, and the second data bus to the first internal bus through a fourth controllable buffer. An interface controller is connected to the address bus and to the first, second, and third control-signal lines and, via internal control-signal lines, to the controllable buffers. The third and fourth control-signal lines and an error-signal line are connected to the second internal bus via a fifth controllable buffer.
34 Citations
15 Claims
- 1. Interface device for controlling the command and data transfer between a host computer and a disk controller, the host computer comprising a first data bus, an address bus, and first control-signal lines, and the disk controller comprising a second data bus and second, third, and fourth control-signal lines, characterized in that the interface device contains a first internal bus and a second internal bus which are interconnected via a first controlled buffer for a first direction of transfer and via a second controlled buffer for a second direction of transfer, that a first check-bit generator and a second check-bit generator are coupled to the first internal bus, that the first data bus is connected to the second internal bus via a third controlled buffer, that the second data bus is connected to the first internal bus via a fourth controlled buffer, that the address bus and the first, second, and third control-signal lines are connected to an interface controller, that the host computer is connected with the interface controller via the address bus and the first control-signal lines, that the disk controller is connected with the interface controller via the second and third control-signal lines, that to transfer a status word indicating the status of the disk controller the third and fourth control-signal lines from the disk controller are connected to the second internal bus via a fifth controlled buffer and an error-signal line is connected to an output of the second check-bit generator and to the second internal bus via the fifth controlled buffer, that the first and second check-bit generators are connected to a sixth controlled buffer linked to the disk controller by a check-bit line, and that the interface controller is connected to the controlled buffers by internal control-signal lines.
Specification