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DP83266 Datasheet(PDF) 57 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 57 Page - National Semiconductor (TI) |
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57 / 152 page  70 Control Information (Continued) MAC Mode Register 2 (MCMR2) The Mode Register 2 (MCMR2) is used to program major operating parameters for the MAC portion of the MACSI device This register should be programmed only at power-on or after a software or hardware Master Reset This register is cleared upon reset Access Rules Address Read Write 005h Always Always Register Bits D7 D6 D5 D4 D3 D2 D1 D0 RES RES RES AFIE LLC MCE SMT MCE RES BOSEL Bit Symbol Description D5 – D7 RES Reserved D4 AFIE AFLAG Inhibit Enable For MACSI Revision D or later this bit enables the recognition of the AFINHIB input pin When AFIE equals zero the MACSI device will ignore the AFINHIB input When AFIE equals one the MACSI will block the internal address recognition flag (AFLAG) between the MAC and System Interface whenever the User asserts the AFINHIB pin For MACSI Revision prior to D this is a Reserved bit D3 LLC MCE LLC Multicast Enable (LLC MCE) When this bit is set the MACSI device will attempt to copy any LLC frame (as determined by the FC field) which also has the IndividualGroup address bit set (ie is using a multicast address) The MAC block will not set the A or C indicators and the copiednot copied counters will not increment D2 SMT MCE SMTMAC Multicast Enable (SMT MCE) When this bit is set the MACSI device will attempt to copy any SMT or MAC frame (as determined by the FC field) which also has the IndividualGroup address bit set (ie is using a multicast address) The MAC block will not set the A or C indicators and the copied not copied counters will not increment D1 RES Reserved D0 BOSEL Bridge Option Select (BOSEL) This bit controls the interconnect of the STRIP and SAT signals from the System Interface block to the MAC block When BOSEL e 0 the SAT output from the System Interface is connected to SAT input of the MAC When BOSEL e 1 the STRIP output of the System Interface is connected to the SAT input of the MAC MAC Revision Register (MCRev) The MAC Revision Register (MCRev) contains the revision number of the Ring Engine Access Rules Address Read Write 007h Always Data Ignored Register Bits D7 D6 D5 D4 D3 D2 D1 D0 REV7 REV6 REV5 REV4 REV3 REV2 REV1 REV0 Bit Symbol Description D7 – D0 REV(7 – 0) Revision Number Bits D7 – D0 contain the version ID of the MAC State Machines Software should consult this register for any software-specific issues related to the current version 57 |
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