Silicon Prawn

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Gray SecurID

====== Images ======

  * [[sid700_teardown|Mechanical teardown of device]]
  * 20X top metal image: https://siliconprawn.org/map/rsa/securid/gray/gray_securid__mit20x__semiplan_lev_noz/
  * [[sid700_sem_2012_10_16|SEM images from 2012-10-16 session]]

====== Die markings ======

  SMSC 2C 2C
  2C5737 18A
  -1P89

====== Chip structure ======

Die is approximately 2.9 X 3.1 mm
==== Process technology ====

2-metal nonplanar CMOS, fairly large dimensions (1um? 750nm?). Based on standard cells with approximately 16 horizontal interconnect channels on M1 between rows of cells and vertical interconnect on M2.

==== CPU ====

12 rows of standard cells, no estimates of total gate count yet.

Based on memory architecture it's likely a 16 bit design.

==== Memory ====

=== First array (top center, red) ===

  * Best guess so far is mask ROM
  * Two identical banks with column addressing circuitry in the middle, row addressing at right
  * Each bank consists of 128 rows
  * Data bus at center left is 16 bits wide
  * Probable structure: 16 bits x 256 rows = 4k bits

Closeup of column outputs. Looks like 16 data bits.

{{:rsa:securid:gray:securid-ibus.jpg?400|}}

=== Second array (top left, gray) ===

  * Best guess so far is SRAM
  * One bank with column addressing circuitry on top and row addressing circuitry at left
  * 16 columns, 64 rows
  * Probable structure: 16 bits x 64 rows = 1k bits


====== Current issue SID700 ======

{{:rsa:securid:sid.jpg?700|}}