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DS2155 Datasheet(PDF) 192 Page - Dallas Semiconductor |
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DS2155 Datasheet(HTML) 192 Page - Dallas Semiconductor |
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192 / 262 page  DS2156 192 of 262 24.8 Receive FIFO Overrun Receive FIFO overrun condition indicates that receive FIFO has been written with four cells before ATM layer reads the cells. The four cells that cause receive FIFO overrun conditions are intact in receive FIFO, and subsequent cells are not written into receive FIFO until ATM layer reads a cell from receive FIFO for the port through UTOPIA-II interface. Receive FIFO overrun condition can optionally be made to raise external interrupt by setting receive FIFO overrun interrupt mask bit U_RCR2.3. 24.9 UTOPIA Diagnostic Loopback Diagnostic loopback toward the ATM layer side (UTOPIA side) can be enabled through receive control register 2, U_RCR2.0. In diagnostic loopback, data, clock, and frame-pulse indication generated by the transmit section of the DS2156 are used instead of the corresponding signals from the physical layer device. Receive physical interface mode should be configured with the same value as transmit physical interface mode. Receive active-edge selection bit should be configured as the opposite edge of that used by the transmit section of the DS2156. It is possible to use the internally generated system clock divided by 8 in place of TCLK for this mode when enabled with U_TCR2.6. |
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