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AM79C988A Datasheet(PDF) 10 Page - Advanced Micro Devices |
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AM79C988A Datasheet(HTML) 10 Page - Advanced Micro Devices |
10 / 25 page 10 Am79C988A PRELIMINARY Link Status B0B1B2B3 The QuIET device reports the Link Status of each port. If Link Test is disabled, Link Status indicates a Link Pass. Bn 0 Link Fail 1 Link Pass Receive Polarity Status C0C1C2C3 The QuIET device reports the polarity status of each port. Cn 0 Reversed Polarity 1 True Polarity Jabber Condition D0D1D2D3 The QuIET device reports the Jabber Condition status for each port. Jabber is defined as continuous transmis- sions by a port for more than 30 ms. Dn 0 No Jabber 1 Jabber Management Commands When DIR switches from LOW to HIGH, the QuIET de- vice reads the command sequence over SDATA. Each management command character is held for 2-bit times (200 ns). The command format is as follows. Management Command Format 0E0E1E2E3F0F1F2F3G0G1G2G3H0H1H2H3I J0J1J2J3KSSSSSSS Note: The QuIET device requires DIR to be high for a minimum of 29 data bits (one bit is four MCLKs), which automatically occurs with the IMR2 device. If any other type of controller is used, DIR must still be high at least 29-bit times. After I, SDATA can be all ones. Extended Distance Option E0E1E2E3 This command modifies the RXD circuit of the trans- ceiver to accommodate signal-attenuation lines longer than 100 meters. En 0 Disable Extended Distance Option 1 Enable Extended Distance Option Link Test Enable F0F1F2F3 This command enables the corresponding port to per- form a Link Test. Link Status will report Link Pass if the Link Test is disabled. Fn 0 Disable Link Test 1 Enable Link Test Transmit Link Pulse Enable G0G1G2G3 This command enables the corresponding port to trans- mit a Link Pulse. The pulse will be transmitted if either a packet or a pulse has not been transmitted for 16 ms. Note that Link Pulses are transmitted when ports are in Link Test Fail. Gn 0 Disable Link Pulse Transmit 1 Enable Link Pulse Transmit Auto Polarity Correction Enable H0H1H2H3 This command allows the QuIET device to detect and correct the polarity of signals at RXD. Hn 0 Enable Auto Polarity 1 Disable Auto Polarity Loopback Test Enable This command enables or disables the loopback test for the twisted pair ports. When enabled, the signal on RXD is retransmitted on TXD. The default condition is loopback test disabled. Note that the TXD drivers have on-chip filtering, which may cause the TXD output to be different from the corresponding RXD input during this test. I 0 Enable Loopback Test 1 Disable Loopback Test Transceiver Mode Selection J0J1J2J3 This command sets the QuIET device either in Full-Du- plex or Normal mode. The default is Normal mode. Jn 0 Full Duplex 1 Normal En Extended Distance 0 Disabled 1 Enabled Fn Link Test 0 Disabled 1 Enabled Gn Transmit Link Test Pulses 0 Disabled 1 Enabled Hn Enable Polarity Correc- tion 0 Enabled 1 Disabled I Loopback Test (All Ports) 0 Enabled 1 Disabled Jn Transceiver Mode 0 Full Duplex 1 Normal (Default condition - IMR2 only supports Normal) K CMOS/PAUI Mode 0 CMOS Mode 1 PAUI Mode S Not used Logic HIGH |
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