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[libreriscv.git] / simple_v_extension / vblock_format_table.mdwn

diff --git a/simple_v_extension/vblock_format_table.mdwn b/simple_v_extension/vblock_format_table.mdwn
index a0c258eb7eebffee1706358aee7a2a530ffc0ad0..b3b6a6586f283b360dc67386472b5cf5bc26eb31 100644 (file)
--- a/simple_v_extension/vblock_format_table.mdwn
+++ b/simple_v_extension/vblock_format_table.mdwn
@@ -23,6 +23,9 @@ The VL/MAXVL/SubVL Block format, when 16xil != 0b111, is:
 
 Note (1) - Registers are in RVC format (x8-x15)
 
+Note (2) - [[specification/sv.setvl]] behaviour is expected, as if an sv.setvl
+instruction had actually been called.
+
 When 16xil is 0b111, this is the "Extended" Format, using the >= 192-bit
 RISC-V ISA format.  Note that the length is 96+16\*nnnnn, not 192+
 
@@ -33,12 +36,26 @@ RISC-V ISA format.  Note that the length is 96+16\*nnnnn, not 192+
 
 VBLOCK2 extends the VBLOCK fields:
 
-| 15:12 | 11:10  | 9:8    | 7:5   | 4:0  |
-| ----- | -----  | ----   | ---   | ---- |
-| rsvd  | rplen2 | pplen2 | swlen | ilen |
+| 15   | 14:12 | 11:10  | 9:8    | 7:5   | 4:0  |
+| ---- | ----- | -----  | ----   | ---   | ---- |
+| rsvd | mapsz | rplen2 | pplen2 | swlen | ilen |
 
 * ilen is the instruction length (number of 16-bit blocks)
 * swlen specifies the number of "swizzle" blocks
 * rplen2 extends rplen by 2 bits
 * pplen2 extends pplen by 2 bits
-* 4 bits are reserved for additional tables (Matrices?)
+* mapsz indicates the size of the "remap" area.  See table below for size
+* 1 bit is reserved for extensions
+
+Mapsz to Remap size is in number of 16-bit blocks:
+
+| mapsz | remap size |
+| ----- | ---------- |
+| 0     | 0          |
+| 1     | 6          |
+| 2     | 7          |
+| 3     | 8          |
+| 4     | 10         |
+| 5     | 12         |
+| 6     | 14         |
+| 7     | 16         |