CCS/RM57L843: 16 Bit async EMIF interface to 32x4096 memory

Marcel Ballmann

Part Number: RM57L843

Tool/software: Code Composer Studio

Hi,

I have EMIF async interface (I configured a 16bit bus in the HALCoGe) from my Hercules to a FPGA. I want to make a DMA. The interface in HW is 16bit Data but the FPGA memory size is 32x4096. How can i realize this in Code, can I just do it like this Ext_Mem_Address = Data32bit_To_Write; even though the databus is 16bit. Did the EMIF managed this all, also the change of the BA Pins? Thank You.

over 8 years ago

0 QJ Wang over 8 years ago

TI__Guru**** 199426 points

Hello Mercel,

To interface 16-bit async memory, the EMIF_BA1 should be connected to FPGA_Addr[0], and EMIF_Addr[0] should be connected to FPGA_Addr[1].

You can read/write 8-bit/16-bit/32-bit data from/to async memory.

0 Marcel Ballmann over 8 years ago in reply to QJ Wang

Intellectual 460 points

Hi Wang, The EMIF_BA1 is connected to an extra BA pin at the FPGA. My Question is how can I write this in code? Can I do it like this Ext_Mem_Address = Data32bit_To_Write; or should I have to shift the 32bit-Word 16bit further and increment the addr? BR
Marcel

0 QJ Wang over 8 years ago in reply to Marcel Ballmann

TI__Guru**** 199426 points

Hello Marcel,

EMIF_BA1 is connected to FPGA address A[0] pin.

I created 2 tables to map MCU address signals (BA1, A0, A1) to 16-bit async memory (Low byte, and upper byte).

Arm-based microcontrollers

Arm-based microcontrollers forum

CCS/RM57L843: 16 Bit async EMIF interface to 32x4096 memory