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DP83934VF Datasheet(PDF) 34 Page - National Semiconductor (TI) |
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DP83934VF Datasheet(HTML) 34 Page - National Semiconductor (TI) |
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34 / 104 page  60 SONIC-T Registers (Continued) TLF11719 – 26 FIGURE 6-1 CAM Organization the SONIC-T is in software reset The CDA resides in the same 64k byte block of memory as the Receive Resource Area (RRA) and contains descriptors for loading the CAM registers These descriptors are contiguous and each de- scriptor consists of four 16-bit fields (Figure 6-2) In 32-bit mode the upper word Dk3116l is not used The first field contains the value to be loaded into the CAM Entry Pointer and the remaining fields are for the three CAM Address Ports (see Section 6310) In addition there is one more field after the last descriptor containing the mask for the CAM Enable register Each of the CAM descriptors are ad- dressed by the CAM Descriptor Pointer (CDP) register After the system has initialized the CDA it can issue the Load CAM command to program the SONIC-T to read the CDA and load the CAM The procedure for issuing the Load CAM command is as follows 1 Initialize the Upper Receive Resource Address (URRA) register Note that the CAM Descriptor Area must reside within the same 64k page as the Receive Resource Area (See Section 639) 2 Initialize the CDA as described above 3 Initialize the CAM Descriptor Count with the number of CAM descriptors Note only the lower 5 bits are used in this register The other bits are don’t cares (See Section 6310) 4 Initialize the CAM Descriptor Pointer to locate the first descriptor in the CDA This register must be reloaded each time a new Load CAM command is issued 5 Issue the Load CAM command (LCAM) in the Command register (See Section 631) If a transmission or reception is in progress the CAM DMA function will not occur until these operations are complete When the SONIC-T completes the Load CAM command the CDP register points to the next location after the CAM enable field and the CDC equals zero The SONIC-T resets the LCAM bit in the Command register and sets the Load CAM Done (LCD) bit in the ISR TLF11719 – 27 FIGURE 6-2 CAM Descriptor Area Format 34 |
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