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SM8213AM 数据表(PDF) 8 Page - Nippon Precision Circuits Inc |
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SM8213AM 数据表(HTML) 8 Page - Nippon Precision Circuits Inc |
8 / 33 page SM8213AM NIPPON PRECISION CIRCUITS—8 Code words (address and message signals) Each code word comprises 32 bits as shown in table 2. Call number to call sign conversion This conversion expands a 7-digit decimal call num- ber into a 21-bit binary call sign, as shown in figure 2. After expansion, the high-order 18 bits are assigned to bits 2 to 19 (address signal), and the low-order 3 bits are the user-defined frame identification pattern, which is stored in ID-ROM. The two function bits define which of four call functions is active. Table 2. Code word format Code word Bit number 1 (MSB)1 1. The MSB is the address/message code word control bit. It is 0 for an address signal, and 1 for a message signal. 2 to 192 2. Bits 2 to 21 contain the address or message information. 20, 212 22 to 313 3. Bits 22 to 31 are BCH(31,21) format generated check bits, where BCH(n,k) = BCH(word length, number of information bits). 32 (LSB)4 4. The LSB is an even-parity bit for bits 1 to 31. Address signal 0 Address bits Function bits Check bits Even-parity bit Message signal 1 Message bits Check bits Even-parity bit 20 21 Function 0 0 A call 0 1 B call 1 0 C call 1 1 D call Figure 2. Call number to call sign conversion 1 2 3456 7 1234 56 789 10 11 12 13 14 15 16 17 18 19 20 21 MSB LSB 7 - digit decimal call signal (gap code) (8 to 2000000) 21 - bit binary conversion Call sign 0 1 2 19 20 21 32 31 22 Frame identification pattern Even - parity bit (for bits 1 to 31) BCH(31, 21) generated check bits Flag : "0" = Adderss signal Function bits Bits 2 to 19 (18 bits) Bits 22 to 31 (10 bits) P |
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