merging changes from OPAE branch making this branch
This commit is contained in:
46
old_rtl/cache/Notes
vendored
Normal file
46
old_rtl/cache/Notes
vendored
Normal file
@@ -0,0 +1,46 @@
|
||||
Notes
|
||||
|
||||
|
||||
8 kB L1 Data Cache | 16 kB L1 I cache (maybe)
|
||||
[tag index offset_remaining_block bank wordOffset], use a blocksize of 128 bytes between memory and cache. So each bank gets 16 bytes.
|
||||
total offset is b its
|
||||
4 bits new offset, 2 bits block, 2 bits word offset
|
||||
xxxxxxxIIIIIIIIoobbbyy
|
||||
9876543210
|
||||
bbbyyyyy
|
||||
o = index into block offset
|
||||
b = bank
|
||||
y = word offset
|
||||
I = index into cach
|
||||
6 bits indexes (64 indeces) No ways || 16 indexes with 4 ways
|
||||
Rest of the bits are tag bits
|
||||
|
||||
blocks / banks = 16 bytes, 8 banks. 128 bytes. 256 indexes (height). width is 16 bytes. 4 words per block (per bank). 17 bit tag
|
||||
|
||||
gtkwave ___.vcd
|
||||
|
||||
|
||||
// Splitting it up
|
||||
|
||||
// word byte
|
||||
wire[127:0][3:0] data_from_ram;
|
||||
|
||||
|
||||
// word byte bank
|
||||
wire[15:0][3:0] bank_data_n[3:0]
|
||||
|
||||
integer i;
|
||||
for (i = 0; i < something; i+=8)
|
||||
{
|
||||
bank_data_n[0][i/8] = data_from_ram[i+0]
|
||||
bank_data_n[1][i/8] = data_from_ram[i+1]
|
||||
bank_data_n[2][i/8] = data_from_ram[i+2]
|
||||
bank_data_n[3][i/8] = data_from_ram[i+3]
|
||||
bank_data_n[4][i/8] = data_from_ram[i+4]
|
||||
bank_data_n[5][i/8] = data_from_ram[i+5]
|
||||
bank_data_n[6][i/8] = data_from_ram[i+6]
|
||||
bank_data_n[7][i/8] = data_from_ram[i+7]
|
||||
}
|
||||
|
||||
|
||||
With Cache. If miss. Go to memory, grab all data, replace that data in the cache. Generate a new request, feed that into the cache (this one will hit), return that
|
||||
Reference in New Issue
Block a user