![]() ![]() 2, programming of the numerous ISP systems 120 of configuration 200, each labeled 100, is initiated when programming data 109 are transferred from a storage element 111 to a controller 105 by a floppy disk or via a communication link, as indicated by arrow 113 (see also FIGS. Manufacturing programming of multiple ISP systems under the present invention is illustrated in the configurations shown in FIGS. The functions of input signals 89 are: (a) SCLK signal 95 synchronizes shifting of programming data 109 (b) MODE signal 97 indicates whether control data or programming data 109 is shifting into or out of ISP devices 102 and (c) ispEN signal 99 causes a state machine within each of ispLSIs 101 and 103 to go into a programming mode. 1, signal 93 (i.e., serial data input signal SDI) is transmitted via terminal 92 through a daisy chain of the SDI and SDO terminals of ispLSI 101 and 103. Signals 95, 97, and 99, provided respectively on terminals 94, 96, and 98, are applied in parallel to each of ispLSIs 101 and 103 to control their programming. The programmed data can be read out through serial data output signal 91 (SDO) using a "verify" command implemented in an ISP state machine of the ISP PLD. Input signals 89 consist of a serial data input signal 93 (SDI), a clock signal 95 (SCLK), a control signal 97 (MODE), and an ISP mode enable signal 99 (ispEN). ![]() ISP devices 102 are programmed using four (4) ISP input signals 89. 1 illustrates an ISP system 100 including ISP devices 102 ("ISP PLDs"), represented by ispLSIs 101 and 103. field programmable gate arrays or programmable logic devices įIG.
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