View source for VideoCore IV 3D Architecture Reference Guide errata

= VideoCore IV 3D Architecture Reference Guide errata =

The first version of the datasheet (VideoCoreIV-AG100-R) was published in 2013/9/16 [http://www.broadcom.com/docs/support/videocore/VideoCoreIV-AG100-R.pdf at www.broadcom.com].

It has some typos. Some of them make it difficult to understand the document.

== p13 ==
The box around "Scoreboard" is "TileBuffer (TLB)".

== p17 Figure 2 ==
"PACK" part is drew as if it can write to entire regfile a.
But it only supports ra[0:15].

== p23 ==
"'''SQRT''', RECIPSQRT, LOG, EXP" should be "'''RECIP''', RECIPSQRT, LOG, EXP".

== p32 Table 8 ==
"R4 '''Pack''' Encoding" should be "R4 '''Unpack''' Encoding".

== p32 Table 9 ==
"5 '''32->8a'''" should be "5 '''32->8b'''".

"6 '''32->8a'''" should be "5 '''32->8c'''".

"7 '''32->8a'''" should be "5 '''32->8d'''".

== p42 Table 17 PTYPE=3 ==
"'''0''' - Reserved" should be "'''11''' - Reserved".

== p45 Table 24 ==
The last column "Bits" is not needed.

== p69 Table 38 code=64 ==
"28 '''0'''" should be "28 '''4'''".

== p70 Table 38 ==
The code "Clipper Z Scale and Offset" after the code "Clipper XY Scaling" should be 106.

== p84 name=V3D_FDBGB ==
"FEP Interface Ready and Stall Signals, FEP Busy Signals" should be "FEP Interface Ready and Stall Signals, '''plus''' FEP Busy Signals".

== p86 Table 53 ==
"Control List Executor Thread List Counter" should be "Control List Executor Thread '''n''' List Counter".

== p87 Table 54 ==
"Control List Executor Thread Primitive List Counter" should be "Control List Executor Thread '''n''' Primitive List Counter".

== p90 ==
There is an extra "\" above the Table 65.

== p94 ==
The addresses of V3D_DBQITC and V3D_DBQITE are not listed in p82-p84.
According to /opt/vc/src/hello_pi/hello_fft/gpu_fft_base.c:
<pre>#define V3D_DBQITE  (0xC00e2c>>2)
#define V3D_DBQITC  (0xC00e30>>2)</pre>

== p99 Table 84==
Writing 1 to V3D_PCTRE:31 is needed to enable performance counters according to Brcm_Android_ICS_Graphics_Stack/brcm_usrlib/dag/vmcsx/middleware/khronos/common/2707b/khrn_prod_4.c.
But the bit is not described. (Written as "reserved".)

= See also =
* [http://vc4-notes.tumblr.com/post/124884410609/define-v3dl2cactl-0xc00020-2-define http://vc4-notes.tumblr.com/post/124884410609/define-v3dl2cactl-0xc00020-2-define]
* [http://vc4-notes.tumblr.com/post/125039428234/v3d-registers-not-on-videocore-iv-3d-architecture V3D registers not on VideoCore IV 3D Architecture Reference Manual but on Brcm_Android_ICS_Graphics_Stack]