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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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PC97307 Scheda tecnica(PDF) 179 Page - National Semiconductor (TI) |
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PC97307 Scheda tecnica(HTML) 179 Page - National Semiconductor (TI) |
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179 / 218 page  179 X-Bus Data Buffer www.national.com 10.0 X-Bus Data Buffer 10.1 FUNCTIONAL OVERVIEW The X-Bus Data Buffer (XDB) connects the 8-bit X data bus to the system data bus via the data bus of the PC87307/PC97307. The XDB is selected by bit 4 of Super/O Chip Configuration 1 register (index 21h), as described in Section 2.4.3 on page 34. This bit is initialized according to the CFG1 strap pin value. 10.2 MAPPING When XDB is not selected, these pins have alternate func- tions. See the XDB pin multiplexing in Table 1-2 on page 23. When XDCS is inactive, XD7-0 are neither driven nor gated to D7-0. When XDCS is active XD7-0, are linked to D7-0 as follows: • D7-0 values are driven onto XD7-0 pins when XDRD is inactive • XD7-0 values are driven onto D7-0 pins when XDRD is active. |
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