Differences

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--- azonenberg:sharp:28f800 [2014/04/14 02:39] – created azonenberg
+++ azonenberg:sharp:28f800 [2025/08/04 21:24] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-{{tag>collection_az vendor_sharp year_1992 year_1998 type_memory type_memory/flash type_memory/flash/nand foundry_sharp tech_250nm}}
+{{tag>collection_az vendor_sharp year_1992 year_1998 type_memory type_memory/flash type_memory/flash/nor foundry_sharp tech_250nm}}
 BIOS flash chip from an Apple iBook Clamshell that tried to sneak into my dorm room sophomore year. Didn't survive ;)
@@ Line 11: / Line 11: @@
 ====== Die ======
-{{:azonenberg:sharp:sharp_28f800_01_bf_neo5x_annotated.jpg?600|}}
+Size is approximately 6410 x 5580 μm (35.76 mm<sup>2</sup>).
-{{:azonenberg:sharp:sharp_28f800_02_bf_neo5x_annotated.jpg?600|}}
+{{:azonenberg:sharp:28f800_bf_neo5x_3k.jpg?600|}}
-{{:azonenberg:sharp:sharp_28f800_03_bf_neo20x_annotated.jpg?600|}}
+Die revision markings and test structures
-{{:azonenberg:sharp:sharp_28f800_04_bf_neo40x_annotated.jpg?600|}}
+{{:azonenberg:sharp:28f800_30_bf_neo40x_annotated.jpg?600|}}
+{{:azonenberg:sharp:28f800_31_bf_neo40x_annotated.jpg?600|}}
+{{:azonenberg:sharp:28f800_32_bf_neo40x_annotated.jpg?600|}}
+{{:azonenberg:sharp:28f800_34_bf_neo40x_annotated.jpg?600|}}
+Address grid markings on main flash array.
+{{:azonenberg:sharp:28f800_33_bf_neo40x_annotated.jpg?600|}}
+Logic in upper left, focus on poly
+{{:azonenberg:sharp:28f800_35_bf_neo40x_annotated.jpg?600|}}
+Same area, focus on M1
+{{:azonenberg:sharp:28f800_36_bf_neo40x_annotated.jpg?600|}}
+Same area, focus on M2
+{{:azonenberg:sharp:28f800_37_bf_neo40x_annotated.jpg?600|}}
+Looked like CMP filler over SRAM at first, but now seems to be NOR mask ROM given the non-repeating pattern.
+bits per column x 16 columns = 256 bits. 3 μm vertical bit pitch, 386 μm high = 128 bits high. 32kbits = 4KB.
+{{:azonenberg:sharp:28f800_38_bf_neo40x_annotated.jpg?600|}}