From: lkcl <lkcl@web>
Date: Thu, 27 Jun 2019 17:20:04 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~4393
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ad6f12271f555e21306a1ad54cdaf26360d5ef49;p=libreriscv.git

---

diff --git a/simple_v_extension/vblock_format.mdwn b/simple_v_extension/vblock_format.mdwn
index c535bdd4c..ed8fdd6c3 100644
--- a/simple_v_extension/vblock_format.mdwn
+++ b/simple_v_extension/vblock_format.mdwn
@@ -157,7 +157,16 @@ SUBVL and ssvoffs).
 
 # PCVBLK CSR Format
 
-TBD
+Using PCVBLK to store the progression of decoding of the VBLOCK allows a simple single issue design to only need to fetch 32 or 64 bits from the instruction cache on any given clock cycle.
+
+To support this option (where more complex implementations may skip some of these phases), VBLOCK contains partial decode state, that allows a trap to occur even oart-way through decode, in order to reduce latency.
+
+The format is as follows:
+
+| vlvalid | bvalid | vlset | 16xil | pplen | rplen | mode | vlblk | opptr |
+| 1 | 1 | 1 | 3 | 2 | 2 | 1 | 16 | 5 |
+
+
 
 # Limitations on instructions