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AM79C976 Datasheet(PDF) 214 Page - Advanced Micro Devices |
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AM79C976 Datasheet(HTML) 214 Page - Advanced Micro Devices |
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214 / 309 page  214 Am79C976 8/01/00 P R E L I M INARY %&5 3&, /DWHQF\ 5HJLVWHU Note: Bits 15-0 in this register are programmable through the EEPROM. Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-8 MAX_LAT Maximum Latency. Specifies the maximum arbitration latency the Am79C976 controller can sustain without causing problems to the network activity. The register val- ue specifies the time in units of 1/4 microseconds. MAX_LAT is aliased to the PCI configuration space register MAX_LAT (offset 3Fh). The host will use the value in the register to determine the setting of the Am79C976 Latency Timer register. Read/Write accessible. MAX_LAT is set to the value of 18h by H_RESET which results in a default maximum latency of 6 microseconds. MAX_LAT is not affected by S_RESET or STOP. 7-0 MIN_GNT Minimum Grant. Specifies the min- imum length of a burst period the Am79C976 controller needs to keep up with the network activity. The length of the burst period is calculated assuming a clock rate of 33 MHz. The register value speci- fies the time in units of 1/4 µs. MIN_GNT is aliased to the PCI configuration space register MIN_GNT (offset 3Eh). The host will use the value in the register to determine the setting of the Am79C976 Latency Timer register. Read/Write accessible. MIN_GNT is set to the value of 18h by H_RESET which results in a default minimum grant of 6 µs. MIN_GNT is not affected by S_RESET or STOP. %&5 3&, 6XEV\VWHP9HQGRU ,'5HJLVWHU Note: Bits 15-0 in this register are programmable through the EEPROM. Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 SVID Subsystem Vendor ID. SVID is used together with SID (BCR24, bits 15-0) to uniquely identify the add-in board or subsystem the Am79C976 controller is used in. Subsystem Vendor IDs can be ob- tained from the PCI SIG. A value of 0 (the default) indicates that the Am79C976 controller does not support subsystem identification. Table 92. Software Styles SWSTYLE [7:0] Style Name SSIZE32 Initialization Block Entries Descriptor Ring Entries 00h LANCE/ PCnet-ISA controller 0 16-bit software structures, non-burst or burst access 16-bit software structures, non-burst access only 01h RES 1 RES RES 02h PCnet-PCI controller 1 32-bit software structures, non-burst or burst access 32-bit software structures, non-burst access only 03h PCnet-PCI controller 1 32-bit software structures, non-burst or burst access 32-bit software structures, non-burst or burst access 04h VLAN 1 Not used 32-bit software structures, non-burst or burst access 05h 64-bit address 1 Not used 32-bit software structures, 32-byte descriptors, non- burst or burst access All Other Reserved Undefined Undefined Undefined |
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