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--- azonenberg:microchip:23k256 [2014/04/08 07:16]
azonenberg
+++ azonenberg:microchip:23k256 [2014/04/08 12:43]
azonenberg
@@ Line 3: / Line 3: @@
 SPI serial SRAM chip. Looks like 4 metal layers and a fairly fine process geometry.
-Definitely //not// one of Microchip's standard fan processes. CMP filler pattern is consistent with UMC 180 nm (pitch and dimensions of CMP filler and traces on both M4 and M3 match [[azonenberg:xilinx:xc2c32a]] within 3%). Die logo etc also do not match the normal Microchip layout.
+Definitely //not// one of Microchip's standard fab processes. CMP filler pattern is consistent with UMC 180 nm (pitch and dimensions of CMP filler and traces on both M4 and M3 match [[azonenberg:xilinx:xc2c32a]] within 3%) however this is the only evidence we have to support this conclusion at this time; tag is tentative.
+The die ID also does not match the normal Microchip layout and there is no Microchip logo on the die. Maybe this mask set was acquired from a buyout or something?
+There are three unbonded pads on the die. Purpose of these is unknown at this time since all known packages are 8 pins.
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