core: define max_payload_size, use dynamic max_request_size/payload_s…

…ize for DMA
enjoy-digital · Nov 4, 2019 · 04f099f · 04f099f
1 parent b85c721
commit 04f099f
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Showing 2 changed files with 4 additions and 4 deletions.
diff --git a/litepcie/core/tlp/common.py b/litepcie/core/tlp/common.py
@@ -23,9 +23,9 @@
     "ca":  0b011
 }
 
+max_payload_size = 512
 max_request_size = 512
 
-
 # headers
 tlp_common_header_length = 16
 tlp_common_header_fields = {

diff --git a/litepcie/frontend/dma.py b/litepcie/frontend/dma.py
@@ -209,7 +209,7 @@ def __init__(self, endpoint, port, table_depth=256):
 
         # requests from table are splitted in chunks of "max_size"
         self.table = table = LitePCIeDMARequestTable(table_depth)
-        splitter = LitePCIeDMARequestSplitter(max_request_size)
+        splitter = LitePCIeDMARequestSplitter(max_size=endpoint.phy.max_request_size)
         self.submodules += table, BufferizeEndpoints({"source": DIR_SOURCE})(ResetInserter()(splitter))
         self.comb += [
             splitter.reset.eq(~enable),
@@ -284,7 +284,7 @@ def __init__(self, endpoint, port, table_depth=256):
 
         enable = self.enable.storage
 
-        max_words_per_request = max_request_size//(endpoint.phy.data_width//8)
+        max_words_per_request = max_payload_size//(endpoint.phy.data_width//8)
         fifo_depth = 4*max_words_per_request
 
         # Data FIFO
@@ -313,7 +313,7 @@ def __init__(self, endpoint, port, table_depth=256):
 
         # requests from table are splitted in chunks of "max_size"
         self.table = table = LitePCIeDMARequestTable(table_depth)
-        splitter = LitePCIeDMARequestSplitter(endpoint.phy.max_payload_size)
+        splitter = LitePCIeDMARequestSplitter(max_size=endpoint.phy.max_payload_size)
         self.submodules += table, BufferizeEndpoints({"source": DIR_SOURCE})(ResetInserter()(splitter))
         self.comb += [
             splitter.reset.eq(~enable),