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DP83916 Datasheet(PDF) 26 Page - National Semiconductor (TI) |
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DP83916 Datasheet(HTML) 26 Page - National Semiconductor (TI) |
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26 / 96 page  40 SONIC-16 Registers (Continued) TABLE 4-1 User Registers (Continued) RA5 – RA0 Access Register Symbol Description (section) WATCHDOG COUNTERS 29 RW Watchdog Timer 0 WT0 4312 2A RW Watchdog Timer 1 WT1 4312 SILICON REVISION 28 R Silicon Revision SR 4313 Note 1 These registers can only be read when the SONIC-16 is in reset mode (RST bit in the CR is set) The SONIC-16 gives invalid data when these registers are read in non-reset mode Note 2 This register can only be written to when the SONIC-16 is in reset mode This register is normally only loaded by the Load CAM command Note 3 The Data Configuration registers DCR and DCR2 can only be written to when the SONIC-16 is in reset mode (RST bit in CR is set) Writing to these registers while not in reset mode does not alter the registers Note 4 The data written to these registers is inverted before being latched That is if a value of FFFFh is written these registers will contain and read back the value of 0000h Data is not inverted during a read operation TABLE 4-2 Internal Use Registers (Users should not write to these registers) (RA5 – RA0) Access Register Symbol Description (section) TRANSMIT REGISTERS 08 (Note 1) RW Transmit Packet Size TPS 35 09 RW Transmit Fragment Count TFC 35 0A RW Transmit Start Address 0 TSA0 35 0B RW Transmit Start Address 1 TSA1 35 0C (Note 2) RW Transmit Fragment Size TFS 35 20 RW Temporary Transmit Descriptor Address TTDA 354 2F R Maximum Deferral Timer MDT 434 RECEIVE REGISTERS 0F RW Current Receive Buffer Address 0 CRBA0 342 3442 10 RW Current Receive Buffer Address 1 CRBA1 342 3442 11 RW Remaining Buffer Word Count 0 RBWC0 342 3442 12 RW Remaining Buffer Word Count 1 RBWC1 342 3442 19 RW Temporary Receive Buffer Address 0 TRBA0 3462 1A RW Temporary Receive Buffer Address 1 TRBA1 3462 1B RW Temporary Buffer Word Count 0 TBWC0 3462 1C RW Temporary Buffer Word Count 1 TBWC1 3462 1F RW Last Link Field Address LLFA none ADDRESS GENERATORS 1D RW Address Generator 0 ADDR0 none 1E RW Address Generator 1 ADDR1 none Note 1 The data that is read from these registers is the inversion of what has been written to them Note 2 The value that is written to this register is shifted once TABLE 4-3 National Factory Test Registers (RA5 – RA0) Access Register Symbol Description (section) 30 These registers are for factory use only Users must not RW address these registers or improper SONIC-16 operation none none 3E can occur 26 |
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