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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83902A датащи(PDF) 18 Page - National Semiconductor (TI) |
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DP83902A датащи(HTML) 18 Page - National Semiconductor (TI) |
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18 / 70 page  70 Packet Reception (Continued) 6 Place the ST-NIC in either mode 1 or mode 2 loopback This can be accomplished by setting bits D2 and D1 of the Transmit Configuration Register to ‘‘01’’ or ‘‘10’’ respectively 7 Issue the START command to the ST-NIC This can be accomplished by writing 22H to the Command Register This is necessary to activate the ST-NIC’s Remote DMA channel 8 Remove one or more packets from the receive buffer ring 9 Reset the overwrite warning (OVW overflow) bit in the Interrupt Status Register 10 Take the ST-NIC out of loopback This is done by writ- ing the Transmit Configration Register with the value it contains during normal operation (Bits D2 and D1 should both be programmed to 0) 11 If the ‘‘Resend’’ variable is set to a 1 reset the ‘‘Re- send’’ variable and reissue the transmit command This is done by writing a value of 26H to the Command Reg- ister If the ‘‘Resend’’ variable is 0 nothing needs to be done Note 1 If Remote DMA is not being used the ST-NIC does not need to be started before packets can be removed from the receive buffer ring Hence step 8 could be done before step 7 Note 2 When the ST-NIC is in STOP mode the Missed Talley Counter is disabled Received Packet Aborted If It Hits Boundary TLF11157 – 13 18 |
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