39.114 GMAC Receive Buffer Size Register Priority Queue x

Name: GMAC_RBSRPQx
Offset: 0x04A0 + (x-1)*0x04 [x=1..2]
Reset: 0x00000002
Property: Read/Write

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
          
Access  
Reset  
Bit 76543210 
 RBS[7:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000010 

Bits 7:0 – RBS[7:0] Receive Buffer Size

DMA receive buffer size in system memory. The value defined by these bits determines the size of buffer to use in main system memory when writing received data.

The value is defined in multiples of 64 bytes such that a value of 0x01 corresponds to buffers of 64 bytes, 0x02 corresponds to 128 bytes etc.

For example:

0x02: 128 bytes

0x18: 1536 bytes (1 × max length frame/buffer)

0xA0: 10240 bytes (1 × 10K jumbo frame/buffer)

Note that this value should never be written as zero.