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1. 发明公开

EP0125921A3 DISK DRIVE CONTROL APPARATUS 失效
标题翻译：磁盘驱动器控制装置
公开(公告)号：EP0125921A3
公开(公告)日：1986-12-30
申请号：EP84303267
申请日：1984-05-15
申请人： DATA GENERAL CORPORATION
发明人： GERSHENSON, EDWARD , LEMONE, LOUIS A. , FALETRA, SALVATORE
IPC分类号： G06F3/06 , G11B20/10 , G11B5/09
CPC分类号： G06F3/0601 , G06F2003/0692
摘要： The apparatus allows a single drive to serve two control lers which provide control signals on respective buses CBI(1) and CBI(2) (1609 and 1613) including RESERVE and RELEASE instructions. These instructions are applied to respective programmable logic arrays (PLAs 1601, 1603) which also receive signals fed back from state registers (1605, 1607). The registers include bits ERES1, ERES2 which are set when respective RESERVE Instructions are received and ERES2, ERES1 respective = 0, bits IRES1, IRES2 which are set when respective RESERVE instructions are received while ERES2, ERES1 respectively = 1 and INT1, INT2 which are set when ERES1, ERES2 = 1 and ERES2, ERES1 = 0 respectively. INT1 and INT2 send interrupts back to the respectively controllers and a controller which is thus enabled to use the drive does so in a succession of operations involving resetting of INT1, INT2 by a status control instruction from the controller. When the controller is finished it sends the RELEASE instruction to reset ERES1, ERES2 as the case may be. If a controller sends a RESERVE instruction, say on CBI(1), when the other controller is using the drive, i.e. ERES2 = 1, ERES1 is not set but IRES1 is set. When the other controller sends RELEASE and resets ERES2, this reset in conjunction with IRES1 = 1 causes ERES1 to be set. The combination ERES1 = 1 and ERES2 = 0 causes INT1 to be set, as above.
摘要翻译：该设备允许单个驱动器服务两个控制器，这两个控制器在包括RESERVE和RELEASE指令的相应总线CBI（1）和CBI（2）（1609和1613）上提供控制信号。这些指令被应用于也接收从状态寄存器（1605,1607）反馈的信号的相应可编程逻辑阵列（PLA 1601,1603）。寄存器包括ERES1，ERES2和ERES2，ERES1，ERES2分别在接收到相应RESERVE指令时设置，ERES2，ERES1分别为0，ERES2，ERES1分别接收RESETVE指令时设置的位IRES1，IRES2 = 1，INT1，INT2分别为当ERES1，ERES2 = 1和ERES2，ERES1 = 0时分别置位。 INT1和INT2将中断发送回相应的控制器，并且因此能够使用该驱动器的控制器通过来自控制器的状态控制指令在涉及INT1，INT2的复位的连续操作中这样做。控制器完成后，它会发送RELEASE指令以根据具体情况重置ERES1，ERES2。如果控制器在CBI（1）上发送RESERVE指令，则当另一个控制器正在使用该驱动器时，即ERES2 = 1，ERES1未置位但IRES1置位。当另一个控制器发送RELEASE并复位ERES2时，该复位与IRES1 = 1一起导致ERES1置位。如上所述，组合ERES1 = 1和ERES2 = 0将导致INT1置位。

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