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三、M114的管脚功能和参数M114有两种,一种是48脚型的 M114A,一种是40脚型的 M114S。这里主要介绍前者。1.管脚的功能M114A 的管脚功能见图2。脚1、18、21、22分别是数字、模拟部分的地线和 V_(DD)端。数、模分别设置电源,可极大地提高信噪比。脚3～8和11～17为外置 ROM 地址。可访问8K 的 ROM。脚2、9、10、47为 EA 有效地址。16个通道哪个在使用,就由此四脚输出相应的有效地址(如对第一个通道输出0000,对最后一个通道输出1111等),由此可控制相应的 ROM群,以使不同的通道产生不同的音色。这四个脚可使 ROM 扩展到128K 字节(8K 字节/通道)。脚24是表1/表2选择控制,该脚给出的
Third, M114 pin functions and parameters There are two kinds of M114, one is 48-pin M114A, one is 40-pin M114S. Here mainly introduces the former. 1. Pin Function M114A’s pin function shown in Figure 2. Pins 1, 18, 21, 22 are the digital, analog ground and V DD terminals, respectively. Number, mode, respectively, set the power, can greatly improve the signal to noise ratio. Feet 3 to 8 and 11 to 17 are external ROM addresses. Can access 8K ROM. Feet 2, 9, 10, 47 are EA valid addresses. Which of the 16 channels is used, the corresponding effective address is outputted by four feet (for example, 0000 for the first channel and 1111 for the last channel, etc.), so that the corresponding ROM group can be controlled so that the different channels Produce different timbre. These four feet can expand the ROM to 128K bytes (8K bytes / channel). Pin 24 is Table 1 / Table 2 Selection Control, given by this pin