Changes between Version 19 and Version 20 of crkit/Software/Firmware/Framework/R3_arch

Timestamp:

Jun 16, 2010, 7:26:24 PM (14 years ago)

Author:

khanhle

Comment:

--

crkit/Software/Firmware/Framework/R3_arch

@@ -49 +49 @@
 === Global Memory Map ===
 
-R3 global memory map is currently divided into 4 regions : Common control, Common Interrupt Control, Receiver and Transmitter. 65Kbytes are reserved for each region. The total number of address bits are 32-bit, but we will only use the lower 16-bits per region e.g. 65Kbytes per region. Therefore, bits31-28 are used for region address decoding between the individual regions as illustrated in figure 2. 
+R3 global memory map is currently divided into 4 regions : Common control, Common Interrupt Control, Receiver and Transmitter. 65Kbytes are reserved for each region. The total number of address bits are 32-bit, but we will only use the lower 16-bits per region e.g. 65Kbytes per region. Therefore, bit31-28 are used for region address decoding between the individual regions as illustrated in figure 2. 
 
 __Table 1 - R3 Global Memory Map__
@@ -74 +74 @@
 
 === Packet Formatting ===
-The CRKit packet format is as shown in figure 3. 
+The CRKit packet format is as shown in figure 3. Host must conform to this specification to enable board level communication. 
 
 __Figure 3 - Packet Format__ 
@@ -87 +87 @@
  * [wiki:Software/Firmware/Framework/R3_arch/tcp TCP]
  
-#for Host -> HW, and HW -> Host directions. Some header information are appended to provide additional control information.[[BR]]    
- 
-#[wiki:Internal/SDR/Firmware/Framework/R3_arch/eth_from_host Host -> HW] : two types of Ethernet frames e.g. rmap and data frames.[[BR]]
-#[wiki:Internal/SDR/Firmware/Framework/R3_arch/eth_to_host HW -> Host] : two types of Ethernet frames e.g. rmap read and data. The data frames are further classified #in additional subtypes such as generic data, FFT data structures and so forth. Host may perform additional processing on the data structures.
+UDP is used for Host <-> CRKit communication e.g. RMAP read/write, status and data transmission. 
 
-#Segmentation - this function is performed by the 'Tx Ethernet Interface' module. This module will automatically segment the data structure if size is greater than #1500 bytes (payload is stored in Rx Buffer). Some control information are appended to denote first, intermediate and last segment. Refer to [wiki:Internal/SDR/Firmware/Framework/R3_arch/eth_to_host HW -> Host] for further details. 
-#[[BR]][[BR]]  
+At this point, fragmentation/reassembly at IP level is not yet supported. We may include this feature in the future. Note that the IP packet size must
+be 46-1500 bytes e.g. size of ethernet payload. Hence, max. UDP payload is 1500 - 20 (IP header) - 8 (UDP header) = 1472 bytes.    
+
+Furthermore, additional header information is added into the payload region for user specific control information.  
+
+[[BR]][[BR]]  
    
 === Control Flow ===