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AM79C976 Datasheet(PDF) 193 Page - Advanced Micro Devices |
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AM79C976 Datasheet(HTML) 193 Page - Advanced Micro Devices |
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193 / 309 page  8/01/00 Am79C976 193 P R E L I M INARY &65 5HVHUYHG Bit Name Description 31-0 RES Reserved locations. Written as zeros and read as undefined. &65 &KLS,' 5HJLVWHU/RZHU Bit Name Description 31-16 RES Reserved locations. Read as undefined. 15-12 PARTIDL Lower 4 bits of the Am79C976 controller part number, i.e. 1000b (8h). PARTIDN and PARTIDL comprise the 16-bit code for the Am79C976 controller, which is 0010 0110 0010 1000b (2628h). This register is exactly the same as the Device ID register in the JTAG description. However, this part number is different from that stored in the Device ID register in the PCI configuration space. PARTIDL is read only. Write op- erations are ignored. 11-1 MANFID Manufacturer ID. The 11-bit man- ufacturer code for AMD is 00000000001b. This code is per the JEDEC Publication 106-A. Note that this code is not the same as the Vendor ID in the PCI configuration space. MANFID is read only. Write oper- ations are ignored. 0 ONE Always a logic 1. ONE is read only. Write opera- tions are ignored. &65 &KLS,' 5HJLVWHU8SSHU Bit Name Description 31-16 RES Reserved locations. Read as un- defined. 15-12 VER Version. This 4-bit pattern is sili- con-revision dependent. VER is read only. Write opera- tions are ignored. 11-0 PARTIDU Upper 12 bits of the Am79C976 controller part number, i.e., 0010 0110 0010b (262h). PARTIDU is read only. Write op- erations are ignored. &65 5HVHUYHG Bit Name Description 31-0 RES Reserved locations. Written as zeros and read as undefined. &65 %XV7LPHRXW Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 MERRTO Obsolete function. Writing has no effect. Read as undefined. &65 5HVHUYHG Bit Name Description 31-0 RES Reserved locations. Written as zeros and read as undefined. &65 0LVVHG)UDPH &RXQW Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 MFC Obsolete function. Replaced by MIB counter. Writing has no ef- fect. Read as undefined. &65 5HVHUYHG Bit Name Description 31-0 RES Reserved locations. Written as zeros and read as undefined. &65 5HFHLYH &ROOLVLRQ&RXQW Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 RCC Obsolete function. Replaced by MIB counter. Writing has no ef- fect. Read as undefined. &65 5HVHUYHG Bit Name Description |
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