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MPC8280 Datasheet(PDF) 895 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 895 Page - Freescale Semiconductor, Inc |
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895 / 1386 page  Multi-Channel Controllers (MCCs) MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 29-5 29.3 Channel-Specific Parameters Each FIFO in the MCC is managed by a set of channel-specific parameters. These parameters can change based upon what protocol is being used on that channel. The following sections describe the various programming models used for an MCC channel. 29.3.1 Channel-Specific HDLC Parameters Table 29-2 describes channel-specific parameters for HDLC. 0x28 C_MASK32 Word CRC constant (user initialized to 0xDEBB20E3). Used for 32-bit CRC-CCITT calculation if HDLC mode is chosen for a selected channel. (This option is programmable. For each HDLC channel, one of two CRC-CCITT can be selected through the CHAMR.) 0x2C XTRABASE Hword Pointer the beginning of the extra parameters information, offset from the DPRAM address 0x2E C_MASK16 Hword CRC constant (user initialized to 0xF0B8). Used for 16-bit CRC-CCITT calculation if HDLC mode is chosen for a selected channel. This option is programmable. For each HDLC channel, one of two CRC-CCITT can be selected through the CHAMR. 0x30 RINTTMP0 Word RINTTMPx. Temporary location for holding a receive circular interrupt circular table entry (for tables 0–4), used by the CP. The user must clear it before enabling interrupts. See Section 29.8, “MCC Exceptions.” 0x34 RINTTMP1 Word 0x38 RINTTMP2 Word 0x3C RINTTMP3 Word 0x40 RINTBASE0 Word RINTBASEx—Multi-channel receiver circular interrupt table base address. The interrupt circular table is a cyclic table (FIFO-like). Each table entry contains information about an interrupt request generated by the MCC to the host. RINTPTRx—Pointer to the receiver circular interrupt table. The CP writes the next interrupt information to this entry when an exception occurs. The user must copy the RINTBASEx value to RINTPTRx before enabling interrupts. Further updates of the RINTPTRx are done by the CP. 0x44 RINTPTR0 Word 0x48 RINTBASE1 Word 0x4C RINTPTR1 Word 0x50 RINTBASE2 Word 0x54 RINTPTR2 Word 0x58 RINTBASE3 Word 0x5C RINTPTR3 Word 0x60 TS_TMP Word Temporary place for time stamp 1 Offset to MCC Base Table 29-1. Global MCC Parameters (continued) Offset1 Name Width Description |
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