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DP83266 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 152 page  30 Architectural Description (Continued) TLF11705 – 6 FIGURE 3-4 Service EngineBIU Internal Block Diagram Upon receiving the data the Indicate Block performs the following functions Decodes the Frame Control field to determine frame type Sorts received frames onto Channels according to the Sort Mode Optionally Filters identical MAC frames Filters Void frames Copies the received frames to memory according to Copy Criteria Writes status for the received frames to the Indicate Status Queue Issues interrupts to the host at host-defined status break- points 342 Request Machine The Request Machine presents frames to the Ring Engine (MAC) in a byte stream format (MA Request) The Request Machine performs the following functions Reads frames from host memory and assembles them onto Request Channels Prioritizes active requests Transmits frames to the Ring Engine (MAC) Optionally writes status for transmitted and returning frames Issues interrupts to the host on user-defined group boundaries 343 StatusSpace Machine The StatusSpace Machine is used by both the Indicate Ma- chine and the Request Machine The StatusSpace Machine manages all descriptor Queues and writes status for received and transmitted frames 344 Bus Interface Unit The Bus Interface Unit (BIU) is used by both the Indicate and Request Blocks It manages the ABus Interface provid- ing the MACSI device with a 32-bit data path to local or system memory The Bus Interface Unit controls the transfer of Data Units and Descriptors between the MACSI device and Host mem- ory via the ABus Data and Descriptors are transferred between the MACSI device and Host memory Each Channel type handles a set of Data and Descriptor objects The three Indicate (Receive) Channels use the following objects 1 Input Data Units (written by MACSI) 2 Input Data Unit Descriptors (written by MACSI) 3 Pool Space Descriptors (read by MACSI) The two Request (Transmit) Channels each use the follow- ing objects 1 Output Data Units (read by MACSI) 2 Output Data Unit Descriptors (read by MACSI) 3 Confirmation Message Descriptors (written by MACSI) 4 Request Descriptors (read by MACSI) 11 |
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