clarify sv cam table

diff --git a/riscv/sv.h b/riscv/sv.h
index ba4092646da3d26fa0fa815243fe9167a9b0e863..58e5724863a1c92b8afa7e16d2a0eeff9385a808 100644 (file)
--- a/riscv/sv.h
+++ b/riscv/sv.h
@@ -5,6 +5,8 @@
 
 // this table is for the CSRs (4? for RV32E, 16 for other types)
 // it's a CAM that's used to generate 2 tables (below)
+// just as in RV, writing to entries in this CAM *clears*
+// all entries with a higher index
 typedef struct {
     unsigned int type   : 1; // 0=INT, 1=FP
     unsigned int regkey : 5; // 5 bits