The HPMS DDR bridge is a data bridge between four AHB bus masters and a single AXI bus slave. It accumulates AHB writes into write combining buffers prior to bursting out to external DDR memory. It also includes read combining buffers, enabling AHB masters to efficiently read data from the external DDR memory from a local buffer. The DDR bridge optimizes reads and writes from multiple masters to a single external DDR memory. Data coherency rules between the four masters and the external DDR memory are implemented in the hardware.
The DDR bridge contains three write combining / Read buffers and one read buffer. All buffers within the DDR bridge are implemented with latches and are not subject to the single event upsets (SEU’s) that SRAM exhibits. For complete details please refer to the Microsemi IGLOO2 User’s Guide.

Write Buffer Time Out Counter

Nke a bụ ihe ngụ oge 10-bit ejiri hazie ndebanye aha oge n'ime modul ihe nchekwa ederede (Njirimara 1). Ozugbo ngụ oge ruru uru oge akwụsị, onye na-ahụ maka mmiri na-ewepụta arịrịọ ntugharị ma ọ bụrụ na enwetara nzaghachi maka arịrịọ ederede gara aga site n'aka onye na-ede akwụkwọ, a ga-eziga arịrịọ a na onye na-ekpe ikpe. Ndebanye aha a bụ ihe a na-ahụkarị maka ndị nchekwa niile.

• Non-Bufferable Region Size – Use this option to set the size of the non-bufferable address region.
• Non-Bufferable Region Address (Upper 16 bits)- Use this option to set the base address of a non-bufferable address region. Bits [15:(N – 1)] of this signal are compared with AHB address [31:(N + 15)] to check whether the address is in a non-bufferable region. The value of N depends on the non-bufferable region size, so the base address is defined according to the DDRB_NB_SZ register that holds the non-bufferable region size value defined in this configurator.
• Enable Write Combining Buffer – Use these options to enable the Write Combining Buffers for the HPDMA and AHB Bus (SWITCH) Masters.
• DDR Burst Size For Read/Write Buffers – Use this to configure the write buffer and read buffer size as per DDR burst size. Buffers can be configured to 16-byte or 32-byte size.

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