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MPC8280 Datasheet(PDF) 941 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 941 Page - Freescale Semiconductor, Inc |
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941 / 1386 page  Fast Communications Controllers (FCCs) MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 30-3 Figure 30-1. FCC Block Diagram 30.2 General FCC Mode Registers (GFMR x) Each FCC contains a general FCC mode register (GFMRx) that defines common FCC options and selects the protocol to be run. The GFMRx are read/write registers cleared at reset. Figure 30-2 shows the GFMR format. Table 30-1. Internal Clocks to CPM Clock Frequency Ratio Mode Internal Clock: CPM clock frequency ratio HDLC 1 bit 1:4 Transparent 1 bit 1:4 HDLC nibble 1:6 Fast Ethernet 1:3 (1:3.5 preferred) ATM 1:3 (1:3.5 preferred) Control Registers Shifter Shifter Delimiter Clock Generator Delimiter Decoder Encoder Receive Control Unit Transmit Control Unit Receive Data FIFO Transmit Data FIFO Modem Lines Modem Lines 60x Bus Peripheral Bus TCLK RCLK Internal Clocks RXD TXD |
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