Motorola MPC823e - Page 780

Communication Processor Module
16-326 MPC823e REFERENCE MANUAL MOTOROLA
SCCs
COMMUNICATION
16
PROCESSOR MODULE
16.9.22.7 SCCx ETHERNET PARAMETER RAM MEMORY MAP. When a serial
communication controller is configured to operate in Ethernet mode, it overlays the structure
used in Table 16-24 onto the parameters described in Table 16-30.
Table 16-30. SCCx Ethernet Parameter RAM Memory Map
ADDRESS NAME WIDTH DESCRIPTION
SCCx Base + 30 C_PRES Word Preset CRC
SCCx Base + 34 C_MASK Word Constant MASK for CRC
SCCx Base + 38 CRCEC Word CRC Error Counter
SCCx Base + 3C ALEC Word Alignment Error Counter
SCCx Base + 40 DISFC Word Discard Frame Counter
SCCx Base + 44 PADS Half-word Short Frame PAD character
SCCx Base + 46 RET_LIM Half-word Retry Limit Threshold
SCCx Base + 48 RET_CNT Half-word Retry Limit Counter
SCCx Base + 4A MFLR Half-word Maximum Frame Length Register
SCCx Base + 4C MINFLR Half-word Minimum Frame Length Register
SCCx Base + 4E MAXD1 Half-word Max DMA1 Length Register
SCCx Base + 50 MAXD2 Half-word Max DMA2 Length Register
SCCx Base + 52 MAXD Half-word RX Max DMA
SCCx Base + 54 DMA_CNT Half-word RX DMA Counter
SCCx Base + 56 MAX_B Half-word Max Buffer Descriptor Byte Count
SCCx Base + 58 GADDR1 Half-word Group Address Filter 1
SCCx Base + 5A GADDR2 Half-word Group Address Filter 2
SCCx Base + 5C GADDR3 Half-word Group Address Filter 3
SCCx Base + 5E GADDR4 Half-word Group Address Filter 4
SCCx Base + 60 TBUF0_DATA0 Word Save Area 0–Current Frame
SCCx Base + 64 TBUF0_DATA1 Word Save Area 1–Current Frame
SCCx Base + 68 TBUF0_RBA0 Word Save RBA–Current Frame
SCCx Base + 6C TBUF0_CRC Word Save CRC–Current Frame
SCCx Base + 70 TBUF0_BCNT Half-word Save BCNT–Current Frame
SCCx Base + 72 PADDR1_L* Half-word Physical Address 1 (LSB)
SCCx Base + 74 PADDR1_M* Half-word Physical Address 1
SCCx Base + 76 PADDR1_H* Half-word Physical Address 1 (MSB)
SCCx Base + 78 P_PER Half-word Persistence
SCCx Base + 7A RFBD_PTR Half-word RX First Buffer Descriptor Pointer
SCCx Base + 7C TFBD_PTR Half-word TX First Buffer Descriptor Pointer
SCCx Base + 7E TLBD_PTR Half-word TX Last Buffer Descriptor Pointer