Differences

This shows you the differences between two versions of the page.

--- goodspeed:ti:tms320lc541b [2022/04/26 05:23] – external edit 127.0.0.1
+++ goodspeed:ti:tms320lc541b [2023/02/16 10:17] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 {{tag>collection_goodspeed vendor_ti type_unknown year_unknown foundry_unknown}}
+<code>
+These photos are of a TMS32LC541B, (M) 1997 by Texas Instruments and
+resold as part number AMBE2020 by DVSI.
+According to the datasheet, it is mask programmed with 5K of SRAM and
+K of ROM.  8K of the ROM are independently wired and can be
+connected to either the data or the instruction bus.
+Looking at the die, we might guess the following regions.
+. A Texas Instruments logo in the center West of the chip.
+. The 28K-word x 16-bit ROM is implemented as fourteen 2K-word banks
+   in seven pairs.  These are found in the West and Southwest,
+   surrounding the model number.  One of these blocks can be
+   reconfigured to be data rather than code, such as for a lookup
+   table.  The ROM bits are visible from the surface, before
+   delayering.
+. Five blocks of 1K-word x 126-bit DARAM are found in the North of
+   the chip.
+Page 21 of the datasheet describes a maskable option to protect the
+contents of the on-chip memories.  When this is enabled, "no
+externally originating instruction can access the on-chip memory
+spaces.
+Memory layout is on page 22.  The `MP/!MC` pin flips the chip between
+Microprocess and Microcomputer modes.  When low, the internal ROM
+appears at 0x9000.  When high, this region is external.  External
+memory can be up to 64K of 16-bit words."
+</code>
@@ Line 20: / Line 53: @@
 </code>
-[[https://siliconpr0n.org/map/ti/tms320lc541b/logo/|logo]]
+[[https://siliconpr0n.org/map/ti/tms320lc541b/goodspeed_logo/|logo]]
-  * [[https://siliconpr0n.org/map/ti/tms320lc541b/single/ti_tms320lc541b_logo.jpg|Single]] (7507x2151, 3.66022MiB)
+  * [[https://siliconpr0n.org/map/ti/tms320lc541b/single/ti_tms320lc541b_goodspeed_logo.jpg|Single]] (7507x2151, 3.66022MiB)
-[[https://siliconpr0n.org/map/ti/tms320lc541b/lowres/|lowres]]
+[[https://siliconpr0n.org/map/ti/tms320lc541b/goodspeed_lowres/|lowres]]
-  * [[https://siliconpr0n.org/map/ti/tms320lc541b/single/ti_tms320lc541b_lowres.jpg|Single]] (6655x6285, 17.5135MiB)
+  * [[https://siliconpr0n.org/map/ti/tms320lc541b/single/ti_tms320lc541b_goodspeed_lowres.jpg|Single]] (6655x6285, 17.5135MiB)