Message Space Data

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

The message space includes:

  • 32 TX buffers
  • 32 RX ID filter-mask pairs
  • 32 TX event buffers
  • 64-deep message RX buffers

The following table provides CANFD message space register information.

Note: This memory space is implemented in RAM. After a reset, the contents are not cleared, but should be considered invalid.
Table 1. CANFD Message Space
Name Register Count Access Type Description
32 TX Buffers - ID, DLC and 16 data words


            TxBuff_ID_Msg_n
        


            TxBuff_DLC_Msg_n
        


            TxBuff_DW00_Msg_n
        

32
32
512

RW
RW
RW

IDs: TxBuff_ID_Msg_{0:31}, addr step = 0x48
DLCs: TxBuff_DLC_Msg_{0:31}, addr step = 0x48
Data: TxBuff_DW{0:15}_Msg_{0:31}, step = 0x48

32 RX Acceptance Filter - Mask and ID


            AF_Mask_Reg_n
        


            AF_ID_Reg_n
        

32
32

RW

RW

Masks: AF_Mask_Reg_{0:31}, addr step = 0x08
IDs: AF_ID_Reg_{0:31}, addr step = 0x08

32 TX Event FIFO - ID and Data Length Codes


            TxEvent_ID_Reg_n
        


            TxEvent_DLC_Reg_n
        

32
32

R
R

IDs: TxEvent_ID_Reg_{0:31}, addr step = 0x08
DLCs: TxEvent_DLC_Reg_{0:31}, addr step = 0x08

32 Message RX Buffer 0


            RxBuff0_ID_Msg_n
        


            RxBuff0_DLC_Msg_n
        


            RxBuff0_DW00_Msg_n
        

64
64
1024

R
R
R

IDs: RxBuff0_ID_Msg_{0:63}, addr step = 0x49
DLCs: RxBuff0_ID_Msg_{0:63}, addr step = 0x48
Data: RxBuff0_DW{0:15}_Msg_{0:63}, step  = 0x48

32 Message RX Buffer 1


            RxBuff1_ID_Msg_n
        


            RxBuff1_DLC_Msg_n
        


            RxBuff1_DW00_Msg_n
        

64
64
1024

R
R
R

IDs: RxBuff1_ID_Msg_{0:63}, addr step = 0x49
DLCs: RxBuff1_ID_Msg_{0:63}, addr step = 0x48
Data: RxBuff1_DW{0:15}_Msg_{0:63}, step = 0x48